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1923 lines
121 KiB
1923 lines
121 KiB
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<!DOCTYPE html>
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<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
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<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Session Library — CodeIgniter 3.1.4 documentation</title>
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<link rel="shortcut icon" href="../_static/ci-icon.ico"/>
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<link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'>
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<link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" />
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<link rel="top" title="CodeIgniter 3.1.4 documentation" href="../index.html"/>
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<link rel="up" title="Libraries" href="index.html"/>
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<link rel="next" title="HTML Table Class" href="table.html"/>
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<link rel="prev" title="Security Class" href="security.html"/>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script>
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<li class="toctree-l1"><a class="reference internal" href="../general/welcome.html">Welcome to CodeIgniter</a><ul class="simple">
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<li class="toctree-l1"><a class="reference internal" href="../installation/index.html">Installation Instructions</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../installation/downloads.html">Downloading CodeIgniter</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/index.html">Installation Instructions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/upgrading.html">Upgrading From a Previous Version</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/troubleshooting.html">Troubleshooting</a></li>
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</ul>
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<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">CodeIgniter Overview</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../overview/getting_started.html">Getting Started</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/at_a_glance.html">CodeIgniter at a Glance</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/features.html">Supported Features</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/appflow.html">Application Flow Chart</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/mvc.html">Model-View-Controller</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li>
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</ul>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../tutorial/index.html">Tutorial</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/static_pages.html">Static pages</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/news_section.html">News section</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
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</ul>
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</li>
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</ul>
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<li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
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</ul>
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</li>
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</ul>
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<ul class="current">
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="benchmark.html">Benchmarking Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching Driver</a></li>
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<li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="cart.html">Shopping Cart Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="config.html">Config Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="encrypt.html">Encrypt Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="image_lib.html">Image Manipulation Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="input.html">Input Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="javascript.html">Javascript Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="language.html">Language Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="loader.html">Loader Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="migration.html">Migrations Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="">Session Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="trackback.html">Trackback Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="section" id="session-library">
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<h1>Session Library<a class="headerlink" href="#session-library" title="Permalink to this headline">¶</a></h1>
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<p>The Session class permits you maintain a user’s “state” and track their
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|
activity while they browse your site.</p>
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<p>CodeIgniter comes with a few session storage drivers:</p>
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<blockquote>
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<div><ul class="simple">
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|
<li>files (default; file-system based)</li>
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<li>database</li>
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<li>redis</li>
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<li>memcached</li>
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</ul>
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</div></blockquote>
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<p>In addition, you may create your own, custom session drivers based on other
|
|
kinds of storage, while still taking advantage of the features of the
|
|
Session class.</p>
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<div class="contents local topic" id="contents">
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<ul class="simple">
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<li><a class="reference internal" href="#using-the-session-class" id="id3">Using the Session Class</a><ul>
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<li><a class="reference internal" href="#initializing-a-session" id="id4">Initializing a Session</a></li>
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<li><a class="reference internal" href="#how-do-sessions-work" id="id5">How do Sessions work?</a><ul>
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<li><a class="reference internal" href="#a-note-about-concurrency" id="id6">A note about concurrency</a></li>
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</ul>
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</li>
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<li><a class="reference internal" href="#what-is-session-data" id="id7">What is Session Data?</a></li>
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<li><a class="reference internal" href="#retrieving-session-data" id="id8">Retrieving Session Data</a></li>
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<li><a class="reference internal" href="#adding-session-data" id="id9">Adding Session Data</a></li>
|
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<li><a class="reference internal" href="#removing-session-data" id="id10">Removing Session Data</a></li>
|
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<li><a class="reference internal" href="#flashdata" id="id11">Flashdata</a></li>
|
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<li><a class="reference internal" href="#tempdata" id="id12">Tempdata</a></li>
|
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<li><a class="reference internal" href="#destroying-a-session" id="id13">Destroying a Session</a></li>
|
|
<li><a class="reference internal" href="#accessing-session-metadata" id="id14">Accessing session metadata</a></li>
|
|
<li><a class="reference internal" href="#session-preferences" id="id15">Session Preferences</a></li>
|
|
<li><a class="reference internal" href="#session-drivers" id="id16">Session Drivers</a><ul>
|
|
<li><a class="reference internal" href="#files-driver" id="id17">Files Driver</a><ul>
|
|
<li><a class="reference internal" href="#bonus-tip" id="id18">Bonus Tip</a></li>
|
|
</ul>
|
|
</li>
|
|
<li><a class="reference internal" href="#database-driver" id="id19">Database Driver</a></li>
|
|
<li><a class="reference internal" href="#redis-driver" id="id20">Redis Driver</a></li>
|
|
<li><a class="reference internal" href="#memcached-driver" id="id21">Memcached Driver</a><ul>
|
|
<li><a class="reference internal" href="#id1" id="id22">Bonus Tip</a></li>
|
|
</ul>
|
|
</li>
|
|
<li><a class="reference internal" href="#custom-drivers" id="id23">Custom Drivers</a></li>
|
|
</ul>
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|
</li>
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|
</ul>
|
|
</li>
|
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<li><a class="reference internal" href="#class-reference" id="id24">Class Reference</a></li>
|
|
</ul>
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|
</div>
|
|
<div class="custom-index container"></div><div class="section" id="using-the-session-class">
|
|
<h2><a class="toc-backref" href="#id3">Using the Session Class</a><a class="headerlink" href="#using-the-session-class" title="Permalink to this headline">¶</a></h2>
|
|
<div class="section" id="initializing-a-session">
|
|
<h3><a class="toc-backref" href="#id4">Initializing a Session</a><a class="headerlink" href="#initializing-a-session" title="Permalink to this headline">¶</a></h3>
|
|
<p>Sessions will typically run globally with each page load, so the Session
|
|
class should either be initialized in your <a class="reference internal" href="../general/controllers.html"><em>controller</em></a> constructors, or it can be <a class="reference internal" href="../general/autoloader.html"><em>auto-loaded</em></a> by the system.
|
|
For the most part the session class will run unattended in the background,
|
|
so simply initializing the class will cause it to read, create, and update
|
|
sessions when necessary.</p>
|
|
<p>To initialize the Session class manually in your controller constructor,
|
|
use the <tt class="docutils literal"><span class="pre">$this->load->library()</span></tt> method:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'session'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>Once loaded, the Sessions library object will be available using:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span>
|
|
</pre></div>
|
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</div>
|
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<div class="admonition important">
|
|
<p class="first admonition-title">Important</p>
|
|
<p class="last">Because the <a class="reference internal" href="loader.html"><em>Loader Class</em></a> is instantiated
|
|
by CodeIgniter’s base controller, make sure to call
|
|
<tt class="docutils literal"><span class="pre">parent::__construct()</span></tt> before trying to load a library from
|
|
inside a controller constructor.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="how-do-sessions-work">
|
|
<h3><a class="toc-backref" href="#id5">How do Sessions work?</a><a class="headerlink" href="#how-do-sessions-work" title="Permalink to this headline">¶</a></h3>
|
|
<p>When a page is loaded, the session class will check to see if valid
|
|
session cookie is sent by the user’s browser. If a sessions cookie does
|
|
<strong>not</strong> exist (or if it doesn’t match one stored on the server or has
|
|
expired) a new session will be created and saved.</p>
|
|
<p>If a valid session does exist, its information will be updated. With each
|
|
update, the session ID may be regenerated if configured to do so.</p>
|
|
<p>It’s important for you to understand that once initialized, the Session
|
|
class runs automatically. There is nothing you need to do to cause the
|
|
above behavior to happen. You can, as you’ll see below, work with session
|
|
data, but the process of reading, writing, and updating a session is
|
|
automatic.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">Under CLI, the Session library will automatically halt itself,
|
|
as this is a concept based entirely on the HTTP protocol.</p>
|
|
</div>
|
|
<div class="section" id="a-note-about-concurrency">
|
|
<h4><a class="toc-backref" href="#id6">A note about concurrency</a><a class="headerlink" href="#a-note-about-concurrency" title="Permalink to this headline">¶</a></h4>
|
|
<p>Unless you’re developing a website with heavy AJAX usage, you can skip this
|
|
section. If you are, however, and if you’re experiencing performance
|
|
issues, then this note is exactly what you’re looking for.</p>
|
|
<p>Sessions in previous versions of CodeIgniter didn’t implement locking,
|
|
which meant that two HTTP requests using the same session could run exactly
|
|
at the same time. To use a more appropriate technical term - requests were
|
|
non-blocking.</p>
|
|
<p>However, non-blocking requests in the context of sessions also means
|
|
unsafe, because modifications to session data (or session ID regeneration)
|
|
in one request can interfere with the execution of a second, concurrent
|
|
request. This detail was at the root of many issues and the main reason why
|
|
CodeIgniter 3.0 has a completely re-written Session library.</p>
|
|
<p>Why are we telling you this? Because it is likely that after trying to
|
|
find the reason for your performance issues, you may conclude that locking
|
|
is the issue and therefore look into how to remove the locks ...</p>
|
|
<p>DO NOT DO THAT! Removing locks would be <strong>wrong</strong> and it will cause you
|
|
more problems!</p>
|
|
<p>Locking is not the issue, it is a solution. Your issue is that you still
|
|
have the session open, while you’ve already processed it and therefore no
|
|
longer need it. So, what you need is to close the session for the
|
|
current request after you no longer need it.</p>
|
|
<p>Long story short - call <tt class="docutils literal"><span class="pre">session_write_close()</span></tt> once you no longer need
|
|
anything to do with session variables.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="what-is-session-data">
|
|
<h3><a class="toc-backref" href="#id7">What is Session Data?</a><a class="headerlink" href="#what-is-session-data" title="Permalink to this headline">¶</a></h3>
|
|
<p>Session data is simply an array associated with a particular session ID
|
|
(cookie).</p>
|
|
<p>If you’ve used sessions in PHP before, you should be familiar with PHP’s
|
|
<a class="reference external" href="http://php.net/manual/en/reserved.variables.session.php">$_SESSION superglobal</a>
|
|
(if not, please read the content on that link).</p>
|
|
<p>CodeIgniter gives access to its session data through the same means, as it
|
|
uses the session handlers’ mechanism provided by PHP. Using session data is
|
|
as simple as manipulating (read, set and unset values) the <tt class="docutils literal"><span class="pre">$_SESSION</span></tt>
|
|
array.</p>
|
|
<p>In addition, CodeIgniter also provides 2 special types of session data
|
|
that are further explained below: flashdata and tempdata.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">In previous versions, regular session data in CodeIgniter was
|
|
referred to as ‘userdata’. Have this in mind if that term is used
|
|
elsewhere in the manual. Most of it is written to explain how
|
|
the custom ‘userdata’ methods work.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="retrieving-session-data">
|
|
<h3><a class="toc-backref" href="#id8">Retrieving Session Data</a><a class="headerlink" href="#retrieving-session-data" title="Permalink to this headline">¶</a></h3>
|
|
<p>Any piece of information from the session array is available through the
|
|
<tt class="docutils literal"><span class="pre">$_SESSION</span></tt> superglobal:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>Or through the magic getter:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">item</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>And for backwards compatibility, through the <tt class="docutils literal"><span class="pre">userdata()</span></tt> method:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">userdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>Where item is the array key corresponding to the item you wish to fetch.
|
|
For example, to assign a previously stored ‘name’ item to the <tt class="docutils literal"><span class="pre">$name</span></tt>
|
|
variable, you will do this:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$name</span> <span class="o">=</span> <span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'name'</span><span class="p">];</span>
|
|
|
|
<span class="c1">// or:</span>
|
|
|
|
<span class="nv">$name</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">name</span>
|
|
|
|
<span class="c1">// or:</span>
|
|
|
|
<span class="nv">$name</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">userdata</span><span class="p">(</span><span class="s1">'name'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">The <tt class="docutils literal"><span class="pre">userdata()</span></tt> method returns NULL if the item you are trying
|
|
to access does not exist.</p>
|
|
</div>
|
|
<p>If you want to retrieve all of the existing userdata, you can simply
|
|
omit the item key (magic getter only works for properties):</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span>
|
|
|
|
<span class="c1">// or:</span>
|
|
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">userdata</span><span class="p">();</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="adding-session-data">
|
|
<h3><a class="toc-backref" href="#id9">Adding Session Data</a><a class="headerlink" href="#adding-session-data" title="Permalink to this headline">¶</a></h3>
|
|
<p>Let’s say a particular user logs into your site. Once authenticated, you
|
|
could add their username and e-mail address to the session, making that
|
|
data globally available to you without having to run a database query when
|
|
you need it.</p>
|
|
<p>You can simply assign data to the <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> array, as with any other
|
|
variable. Or as a property of <tt class="docutils literal"><span class="pre">$this->session</span></tt>.</p>
|
|
<p>Alternatively, the old method of assigning it as “userdata” is also
|
|
available. That however passing an array containing your new data to the
|
|
<tt class="docutils literal"><span class="pre">set_userdata()</span></tt> method:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_userdata</span><span class="p">(</span><span class="nv">$array</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>Where <tt class="docutils literal"><span class="pre">$array</span></tt> is an associative array containing your new data. Here’s
|
|
an example:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$newdata</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
|
|
<span class="s1">'username'</span> <span class="o">=></span> <span class="s1">'johndoe'</span><span class="p">,</span>
|
|
<span class="s1">'email'</span> <span class="o">=></span> <span class="s1">'johndoe@some-site.com'</span><span class="p">,</span>
|
|
<span class="s1">'logged_in'</span> <span class="o">=></span> <span class="k">TRUE</span>
|
|
<span class="p">);</span>
|
|
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_userdata</span><span class="p">(</span><span class="nv">$newdata</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>If you want to add userdata one value at a time, <tt class="docutils literal"><span class="pre">set_userdata()</span></tt> also
|
|
supports this syntax:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_userdata</span><span class="p">(</span><span class="s1">'some_name'</span><span class="p">,</span> <span class="s1">'some_value'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>If you want to verify that a session value exists, simply check with
|
|
<tt class="docutils literal"><span class="pre">isset()</span></tt>:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// returns FALSE if the 'some_name' item doesn't exist or is NULL,</span>
|
|
<span class="c1">// TRUE otherwise:</span>
|
|
<span class="nb">isset</span><span class="p">(</span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'some_name'</span><span class="p">])</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>Or you can call <tt class="docutils literal"><span class="pre">has_userdata()</span></tt>:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">has_userdata</span><span class="p">(</span><span class="s1">'some_name'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="removing-session-data">
|
|
<h3><a class="toc-backref" href="#id10">Removing Session Data</a><a class="headerlink" href="#removing-session-data" title="Permalink to this headline">¶</a></h3>
|
|
<p>Just as with any other variable, unsetting a value in <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> can be
|
|
done through <tt class="docutils literal"><span class="pre">unset()</span></tt>:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">unset</span><span class="p">(</span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'some_name'</span><span class="p">]);</span>
|
|
|
|
<span class="c1">// or multiple values:</span>
|
|
|
|
<span class="nb">unset</span><span class="p">(</span>
|
|
<span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'some_name'</span><span class="p">],</span>
|
|
<span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'another_name'</span><span class="p">]</span>
|
|
<span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>Also, just as <tt class="docutils literal"><span class="pre">set_userdata()</span></tt> can be used to add information to a
|
|
session, <tt class="docutils literal"><span class="pre">unset_userdata()</span></tt> can be used to remove it, by passing the
|
|
session key. For example, if you wanted to remove ‘some_name’ from your
|
|
session data array:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">unset_userdata</span><span class="p">(</span><span class="s1">'some_name'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>This method also accepts an array of item keys to unset:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$array_items</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'username'</span><span class="p">,</span> <span class="s1">'email'</span><span class="p">);</span>
|
|
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">unset_userdata</span><span class="p">(</span><span class="nv">$array_items</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">In previous versions, the <tt class="docutils literal"><span class="pre">unset_userdata()</span></tt> method used
|
|
to accept an associative array of <tt class="docutils literal"><span class="pre">key</span> <span class="pre">=></span> <span class="pre">'dummy</span> <span class="pre">value'</span></tt>
|
|
pairs. This is no longer supported.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="flashdata">
|
|
<h3><a class="toc-backref" href="#id11">Flashdata</a><a class="headerlink" href="#flashdata" title="Permalink to this headline">¶</a></h3>
|
|
<p>CodeIgniter supports “flashdata”, or session data that will only be
|
|
available for the next request, and is then automatically cleared.</p>
|
|
<p>This can be very useful, especially for one-time informational, error or
|
|
status messages (for example: “Record 2 deleted”).</p>
|
|
<p>It should be noted that flashdata variables are regular session vars,
|
|
only marked in a specific way under the ‘__ci_vars’ key (please don’t touch
|
|
that one, you’ve been warned).</p>
|
|
<p>To mark an existing item as “flashdata”:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_flash</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>If you want to mark multiple items as flashdata, simply pass the keys as an
|
|
array:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_flash</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="s1">'item2'</span><span class="p">));</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>To add flashdata:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'value'</span><span class="p">;</span>
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_flash</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>Or alternatively, using the <tt class="docutils literal"><span class="pre">set_flashdata()</span></tt> method:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_flashdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="s1">'value'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>You can also pass an array to <tt class="docutils literal"><span class="pre">set_flashdata()</span></tt>, in the same manner as
|
|
<tt class="docutils literal"><span class="pre">set_userdata()</span></tt>.</p>
|
|
<p>Reading flashdata variables is the same as reading regular session data
|
|
through <tt class="docutils literal"><span class="pre">$_SESSION</span></tt>:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="admonition important">
|
|
<p class="first admonition-title">Important</p>
|
|
<p class="last">The <tt class="docutils literal"><span class="pre">userdata()</span></tt> method will NOT return flashdata items.</p>
|
|
</div>
|
|
<p>However, if you want to be sure that you’re reading “flashdata” (and not
|
|
any other kind), you can also use the <tt class="docutils literal"><span class="pre">flashdata()</span></tt> method:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">flashdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>Or to get an array with all flashdata, simply omit the key parameter:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">flashdata</span><span class="p">();</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">The <tt class="docutils literal"><span class="pre">flashdata()</span></tt> method returns NULL if the item cannot be
|
|
found.</p>
|
|
</div>
|
|
<p>If you find that you need to preserve a flashdata variable through an
|
|
additional request, you can do so using the <tt class="docutils literal"><span class="pre">keep_flashdata()</span></tt> method.
|
|
You can either pass a single item or an array of flashdata items to keep.</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">keep_flashdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span>
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">keep_flashdata</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">'item1'</span><span class="p">,</span> <span class="s1">'item2'</span><span class="p">,</span> <span class="s1">'item3'</span><span class="p">));</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="tempdata">
|
|
<h3><a class="toc-backref" href="#id12">Tempdata</a><a class="headerlink" href="#tempdata" title="Permalink to this headline">¶</a></h3>
|
|
<p>CodeIgniter also supports “tempdata”, or session data with a specific
|
|
expiration time. After the value expires, or the session expires or is
|
|
deleted, the value is automatically removed.</p>
|
|
<p>Similarly to flashdata, tempdata variables are regular session vars that
|
|
are marked in a specific way under the ‘__ci_vars’ key (again, don’t touch
|
|
that one).</p>
|
|
<p>To mark an existing item as “tempdata”, simply pass its key and expiry time
|
|
(in seconds!) to the <tt class="docutils literal"><span class="pre">mark_as_temp()</span></tt> method:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// 'item' will be erased after 300 seconds</span>
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_temp</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="mi">300</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>You can mark multiple items as tempdata in two ways, depending on whether
|
|
you want them all to have the same expiry time or not:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Both 'item' and 'item2' will expire after 300 seconds</span>
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_temp</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="s1">'item2'</span><span class="p">),</span> <span class="mi">300</span><span class="p">);</span>
|
|
|
|
<span class="c1">// 'item' will be erased after 300 seconds, while 'item2'</span>
|
|
<span class="c1">// will do so after only 240 seconds</span>
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_temp</span><span class="p">(</span><span class="k">array</span><span class="p">(</span>
|
|
<span class="s1">'item'</span> <span class="o">=></span> <span class="mi">300</span><span class="p">,</span>
|
|
<span class="s1">'item2'</span> <span class="o">=></span> <span class="mi">240</span>
|
|
<span class="p">));</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>To add tempdata:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'value'</span><span class="p">;</span>
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">mark_as_temp</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="mi">300</span><span class="p">);</span> <span class="c1">// Expire in 5 minutes</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>Or alternatively, using the <tt class="docutils literal"><span class="pre">set_tempdata()</span></tt> method:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_tempdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">,</span> <span class="s1">'value'</span><span class="p">,</span> <span class="mi">300</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>You can also pass an array to <tt class="docutils literal"><span class="pre">set_tempdata()</span></tt>:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$tempdata</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'newuser'</span> <span class="o">=></span> <span class="k">TRUE</span><span class="p">,</span> <span class="s1">'message'</span> <span class="o">=></span> <span class="s1">'Thanks for joining!'</span><span class="p">);</span>
|
|
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">set_tempdata</span><span class="p">(</span><span class="nv">$tempdata</span><span class="p">,</span> <span class="k">NULL</span><span class="p">,</span> <span class="nv">$expire</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">If the expiration is omitted or set to 0, the default
|
|
time-to-live value of 300 seconds (or 5 minutes) will be used.</p>
|
|
</div>
|
|
<p>To read a tempdata variable, again you can just access it through the
|
|
<tt class="docutils literal"><span class="pre">$_SESSION</span></tt> superglobal array:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="admonition important">
|
|
<p class="first admonition-title">Important</p>
|
|
<p class="last">The <tt class="docutils literal"><span class="pre">userdata()</span></tt> method will NOT return tempdata items.</p>
|
|
</div>
|
|
<p>Or if you want to be sure that you’re reading “tempdata” (and not any
|
|
other kind), you can also use the <tt class="docutils literal"><span class="pre">tempdata()</span></tt> method:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">tempdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>And of course, if you want to retrieve all existing tempdata:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">tempdata</span><span class="p">();</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">The <tt class="docutils literal"><span class="pre">tempdata()</span></tt> method returns NULL if the item cannot be
|
|
found.</p>
|
|
</div>
|
|
<p>If you need to remove a tempdata value before it expires, you can directly
|
|
unset it from the <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> array:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">unset</span><span class="p">(</span><span class="nv">$_SESSION</span><span class="p">[</span><span class="s1">'item'</span><span class="p">]);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>However, this won’t remove the marker that makes this specific item to be
|
|
tempdata (it will be invalidated on the next HTTP request), so if you
|
|
intend to reuse that same key in the same request, you’d want to use
|
|
<tt class="docutils literal"><span class="pre">unset_tempdata()</span></tt>:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">unset_tempdata</span><span class="p">(</span><span class="s1">'item'</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="destroying-a-session">
|
|
<h3><a class="toc-backref" href="#id13">Destroying a Session</a><a class="headerlink" href="#destroying-a-session" title="Permalink to this headline">¶</a></h3>
|
|
<p>To clear the current session (for example, during a logout), you may
|
|
simply use either PHP’s <a class="reference external" href="http://php.net/session_destroy">session_destroy()</a>
|
|
function, or the <tt class="docutils literal"><span class="pre">sess_destroy()</span></tt> method. Both will work in exactly the
|
|
same way:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">session_destroy</span><span class="p">();</span>
|
|
|
|
<span class="c1">// or</span>
|
|
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">sess_destroy</span><span class="p">();</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This must be the last session-related operation that you do
|
|
during the same request. All session data (including flashdata and
|
|
tempdata) will be destroyed permanently and functions will be
|
|
unusable during the same request after you destroy the session.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="accessing-session-metadata">
|
|
<h3><a class="toc-backref" href="#id14">Accessing session metadata</a><a class="headerlink" href="#accessing-session-metadata" title="Permalink to this headline">¶</a></h3>
|
|
<p>In previous CodeIgniter versions, the session data array included 4 items
|
|
by default: ‘session_id’, ‘ip_address’, ‘user_agent’, ‘last_activity’.</p>
|
|
<p>This was due to the specifics of how sessions worked, but is now no longer
|
|
necessary with our new implementation. However, it may happen that your
|
|
application relied on these values, so here are alternative methods of
|
|
accessing them:</p>
|
|
<blockquote>
|
|
<div><ul class="simple">
|
|
<li>session_id: <tt class="docutils literal"><span class="pre">session_id()</span></tt></li>
|
|
<li>ip_address: <tt class="docutils literal"><span class="pre">$_SERVER['REMOTE_ADDR']</span></tt></li>
|
|
<li>user_agent: <tt class="docutils literal"><span class="pre">$this->input->user_agent()</span></tt> (unused by sessions)</li>
|
|
<li>last_activity: Depends on the storage, no straightforward way. Sorry!</li>
|
|
</ul>
|
|
</div></blockquote>
|
|
</div>
|
|
<div class="section" id="session-preferences">
|
|
<h3><a class="toc-backref" href="#id15">Session Preferences</a><a class="headerlink" href="#session-preferences" title="Permalink to this headline">¶</a></h3>
|
|
<p>CodeIgniter will usually make everything work out of the box. However,
|
|
Sessions are a very sensitive component of any application, so some
|
|
careful configuration must be done. Please take your time to consider
|
|
all of the options and their effects.</p>
|
|
<p>You’ll find the following Session related preferences in your
|
|
<strong>application/config/config.php</strong> file:</p>
|
|
<table border="1" class="docutils">
|
|
<colgroup>
|
|
<col width="16%" />
|
|
<col width="9%" />
|
|
<col width="23%" />
|
|
<col width="53%" />
|
|
</colgroup>
|
|
<thead valign="bottom">
|
|
<tr class="row-odd"><th class="head">Preference</th>
|
|
<th class="head">Default</th>
|
|
<th class="head">Options</th>
|
|
<th class="head">Description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody valign="top">
|
|
<tr class="row-even"><td><strong>sess_driver</strong></td>
|
|
<td>files</td>
|
|
<td>files/database/redis/memcached/<em>custom</em></td>
|
|
<td>The session storage driver to use.</td>
|
|
</tr>
|
|
<tr class="row-odd"><td><strong>sess_cookie_name</strong></td>
|
|
<td>ci_session</td>
|
|
<td>[A-Za-z_-] characters only</td>
|
|
<td>The name used for the session cookie.</td>
|
|
</tr>
|
|
<tr class="row-even"><td><strong>sess_expiration</strong></td>
|
|
<td>7200 (2 hours)</td>
|
|
<td>Time in seconds (integer)</td>
|
|
<td>The number of seconds you would like the session to last.
|
|
If you would like a non-expiring session (until browser is closed) set the value to zero: 0</td>
|
|
</tr>
|
|
<tr class="row-odd"><td><strong>sess_save_path</strong></td>
|
|
<td>NULL</td>
|
|
<td>None</td>
|
|
<td>Specifies the storage location, depends on the driver being used.</td>
|
|
</tr>
|
|
<tr class="row-even"><td><strong>sess_match_ip</strong></td>
|
|
<td>FALSE</td>
|
|
<td>TRUE/FALSE (boolean)</td>
|
|
<td>Whether to validate the user’s IP address when reading the session cookie.
|
|
Note that some ISPs dynamically changes the IP, so if you want a non-expiring session you
|
|
will likely set this to FALSE.</td>
|
|
</tr>
|
|
<tr class="row-odd"><td><strong>sess_time_to_update</strong></td>
|
|
<td>300</td>
|
|
<td>Time in seconds (integer)</td>
|
|
<td>This option controls how often the session class will regenerate itself and create a new
|
|
session ID. Setting it to 0 will disable session ID regeneration.</td>
|
|
</tr>
|
|
<tr class="row-even"><td><strong>sess_regenerate_destroy</strong></td>
|
|
<td>FALSE</td>
|
|
<td>TRUE/FALSE (boolean)</td>
|
|
<td>Whether to destroy session data associated with the old session ID when auto-regenerating
|
|
the session ID. When set to FALSE, the data will be later deleted by the garbage collector.</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">As a last resort, the Session library will try to fetch PHP’s
|
|
session related INI settings, as well as legacy CI settings such as
|
|
‘sess_expire_on_close’ when any of the above is not configured.
|
|
However, you should never rely on this behavior as it can cause
|
|
unexpected results or be changed in the future. Please configure
|
|
everything properly.</p>
|
|
</div>
|
|
<p>In addition to the values above, the cookie and native drivers apply the
|
|
following configuration values shared by the <a class="reference internal" href="input.html"><em>Input</em></a> and
|
|
<a class="reference internal" href="security.html"><em>Security</em></a> classes:</p>
|
|
<table border="1" class="docutils">
|
|
<colgroup>
|
|
<col width="17%" />
|
|
<col width="14%" />
|
|
<col width="69%" />
|
|
</colgroup>
|
|
<thead valign="bottom">
|
|
<tr class="row-odd"><th class="head">Preference</th>
|
|
<th class="head">Default</th>
|
|
<th class="head">Description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody valign="top">
|
|
<tr class="row-even"><td><strong>cookie_domain</strong></td>
|
|
<td>‘’</td>
|
|
<td>The domain for which the session is applicable</td>
|
|
</tr>
|
|
<tr class="row-odd"><td><strong>cookie_path</strong></td>
|
|
<td>/</td>
|
|
<td>The path to which the session is applicable</td>
|
|
</tr>
|
|
<tr class="row-even"><td><strong>cookie_secure</strong></td>
|
|
<td>FALSE</td>
|
|
<td>Whether to create the session cookie only on encrypted (HTTPS) connections</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">The ‘cookie_httponly’ setting doesn’t have an effect on sessions.
|
|
Instead the HttpOnly parameter is always enabled, for security
|
|
reasons. Additionally, the ‘cookie_prefix’ setting is completely
|
|
ignored.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="session-drivers">
|
|
<h3><a class="toc-backref" href="#id16">Session Drivers</a><a class="headerlink" href="#session-drivers" title="Permalink to this headline">¶</a></h3>
|
|
<p>As already mentioned, the Session library comes with 4 drivers, or storage
|
|
engines, that you can use:</p>
|
|
<blockquote>
|
|
<div><ul class="simple">
|
|
<li>files</li>
|
|
<li>database</li>
|
|
<li>redis</li>
|
|
<li>memcached</li>
|
|
</ul>
|
|
</div></blockquote>
|
|
<p>By default, the <a class="reference internal" href="#files-driver">Files Driver</a> will be used when a session is initialized,
|
|
because it is the most safe choice and is expected to work everywhere
|
|
(virtually every environment has a file system).</p>
|
|
<p>However, any other driver may be selected via the <tt class="docutils literal"><span class="pre">$config['sess_driver']</span></tt>
|
|
line in your <strong>application/config/config.php</strong> file, if you chose to do so.
|
|
Have it in mind though, every driver has different caveats, so be sure to
|
|
get yourself familiar with them (below) before you make that choice.</p>
|
|
<p>In addition, you may also create and use <a class="reference internal" href="#custom-drivers">Custom Drivers</a>, if the ones
|
|
provided by default don’t satisfy your use case.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">In previous CodeIgniter versions, a different, “cookie driver”
|
|
was the only option and we have received negative feedback on not
|
|
providing that option. While we do listen to feedback from the
|
|
community, we want to warn you that it was dropped because it is
|
|
<strong>unsafe</strong> and we advise you NOT to try to replicate it via a
|
|
custom driver.</p>
|
|
</div>
|
|
<div class="section" id="files-driver">
|
|
<h4><a class="toc-backref" href="#id17">Files Driver</a><a class="headerlink" href="#files-driver" title="Permalink to this headline">¶</a></h4>
|
|
<p>The ‘files’ driver uses your file system for storing session data.</p>
|
|
<p>It can safely be said that it works exactly like PHP’s own default session
|
|
implementation, but in case this is an important detail for you, have it
|
|
mind that it is in fact not the same code and it has some limitations
|
|
(and advantages).</p>
|
|
<p>To be more specific, it doesn’t support PHP’s <a class="reference external" href="http://php.net/manual/en/session.configuration.php#ini.session.save-path">directory level and mode
|
|
formats used in session.save_path</a>,
|
|
and it has most of the options hard-coded for safety. Instead, only
|
|
absolute paths are supported for <tt class="docutils literal"><span class="pre">$config['sess_save_path']</span></tt>.</p>
|
|
<p>Another important thing that you should know, is to make sure that you
|
|
don’t use a publicly-readable or shared directory for storing your session
|
|
files. Make sure that <em>only you</em> have access to see the contents of your
|
|
chosen <em>sess_save_path</em> directory. Otherwise, anybody who can do that, can
|
|
also steal any of the current sessions (also known as “session fixation”
|
|
attack).</p>
|
|
<p>On UNIX-like operating systems, this is usually achieved by setting the
|
|
0700 mode permissions on that directory via the <cite>chmod</cite> command, which
|
|
allows only the directory’s owner to perform read and write operations on
|
|
it. But be careful because the system user <em>running</em> the script is usually
|
|
not your own, but something like ‘www-data’ instead, so only setting those
|
|
permissions will probable break your application.</p>
|
|
<p>Instead, you should do something like this, depending on your environment</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">mkdir</span> <span class="o">/<</span><span class="nx">path</span> <span class="nx">to</span> <span class="nx">your</span> <span class="nx">application</span> <span class="nx">directory</span><span class="o">>/</span><span class="nx">sessions</span><span class="o">/</span>
|
|
<span class="nb">chmod</span> <span class="mo">0700</span> <span class="o">/<</span><span class="nx">path</span> <span class="nx">to</span> <span class="nx">your</span> <span class="nx">application</span> <span class="nx">directory</span><span class="o">>/</span><span class="nx">sessions</span><span class="o">/</span>
|
|
<span class="nb">chown</span> <span class="nx">www</span><span class="o">-</span><span class="nx">data</span> <span class="o">/<</span><span class="nx">path</span> <span class="nx">to</span> <span class="nx">your</span> <span class="nx">application</span> <span class="nx">directory</span><span class="o">>/</span><span class="nx">sessions</span><span class="o">/</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="section" id="bonus-tip">
|
|
<h5><a class="toc-backref" href="#id18">Bonus Tip</a><a class="headerlink" href="#bonus-tip" title="Permalink to this headline">¶</a></h5>
|
|
<p>Some of you will probably opt to choose another session driver because
|
|
file storage is usually slower. This is only half true.</p>
|
|
<p>A very basic test will probably trick you into believing that an SQL
|
|
database is faster, but in 99% of the cases, this is only true while you
|
|
only have a few current sessions. As the sessions count and server loads
|
|
increase - which is the time when it matters - the file system will
|
|
consistently outperform almost all relational database setups.</p>
|
|
<p>In addition, if performance is your only concern, you may want to look
|
|
into using <a class="reference external" href="http://eddmann.com/posts/storing-php-sessions-file-caches-in-memory-using-tmpfs/">tmpfs</a>,
|
|
(warning: external resource), which can make your sessions blazing fast.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="database-driver">
|
|
<h4><a class="toc-backref" href="#id19">Database Driver</a><a class="headerlink" href="#database-driver" title="Permalink to this headline">¶</a></h4>
|
|
<p>The ‘database’ driver uses a relational database such as MySQL or
|
|
PostgreSQL to store sessions. This is a popular choice among many users,
|
|
because it allows the developer easy access to the session data within
|
|
an application - it is just another table in your database.</p>
|
|
<p>However, there are some conditions that must be met:</p>
|
|
<blockquote>
|
|
<div><ul class="simple">
|
|
<li>Only your <strong>default</strong> database connection (or the one that you access
|
|
as <tt class="docutils literal"><span class="pre">$this->db</span></tt> from your controllers) can be used.</li>
|
|
<li>You must have the <a class="reference internal" href="../database/query_builder.html"><em>Query Builder</em></a>
|
|
enabled.</li>
|
|
<li>You can NOT use a persistent connection.</li>
|
|
<li>You can NOT use a connection with the <em>cache_on</em> setting enabled.</li>
|
|
</ul>
|
|
</div></blockquote>
|
|
<p>In order to use the ‘database’ session driver, you must also create this
|
|
table that we already mentioned and then set it as your
|
|
<tt class="docutils literal"><span class="pre">$config['sess_save_path']</span></tt> value.
|
|
For example, if you would like to use ‘ci_sessions’ as your table name,
|
|
you would do this:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_driver'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'database'</span><span class="p">;</span>
|
|
<span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_save_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'ci_sessions'</span><span class="p">;</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">If you’ve upgraded from a previous version of CodeIgniter and
|
|
you don’t have ‘sess_save_path’ configured, then the Session
|
|
library will look for the old ‘sess_table_name’ setting and use
|
|
it instead. Please don’t rely on this behavior as it will get
|
|
removed in the future.</p>
|
|
</div>
|
|
<p>And then of course, create the database table ...</p>
|
|
<p>For MySQL:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">CREATE</span> <span class="nx">TABLE</span> <span class="k">IF</span> <span class="k">NOT</span> <span class="nx">EXISTS</span> <span class="sb">`ci_sessions`</span> <span class="p">(</span>
|
|
<span class="sb">`id`</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">128</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
|
<span class="sb">`ip_address`</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">45</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
|
<span class="sb">`timestamp`</span> <span class="nx">int</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="nx">unsigned</span> <span class="k">DEFAULT</span> <span class="mi">0</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
|
<span class="sb">`data`</span> <span class="nx">blob</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
|
<span class="nx">KEY</span> <span class="sb">`ci_sessions_timestamp`</span> <span class="p">(</span><span class="sb">`timestamp`</span><span class="p">)</span>
|
|
<span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>For PostgreSQL:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">CREATE</span> <span class="nx">TABLE</span> <span class="s2">"ci_sessions"</span> <span class="p">(</span>
|
|
<span class="s2">"id"</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">128</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
|
<span class="s2">"ip_address"</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">45</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
|
<span class="s2">"timestamp"</span> <span class="nx">bigint</span> <span class="k">DEFAULT</span> <span class="mi">0</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
|
<span class="s2">"data"</span> <span class="nx">text</span> <span class="k">DEFAULT</span> <span class="s1">''</span> <span class="k">NOT</span> <span class="k">NULL</span>
|
|
<span class="p">);</span>
|
|
|
|
<span class="nx">CREATE</span> <span class="nx">INDEX</span> <span class="s2">"ci_sessions_timestamp"</span> <span class="nx">ON</span> <span class="s2">"ci_sessions"</span> <span class="p">(</span><span class="s2">"timestamp"</span><span class="p">);</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>You will also need to add a PRIMARY KEY <strong>depending on your ‘sess_match_ip’
|
|
setting</strong>. The examples below work both on MySQL and PostgreSQL:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// When sess_match_ip = TRUE</span>
|
|
<span class="nx">ALTER</span> <span class="nx">TABLE</span> <span class="nx">ci_sessions</span> <span class="nx">ADD</span> <span class="nx">PRIMARY</span> <span class="nx">KEY</span> <span class="p">(</span><span class="nx">id</span><span class="p">,</span> <span class="nx">ip_address</span><span class="p">);</span>
|
|
|
|
<span class="c1">// When sess_match_ip = FALSE</span>
|
|
<span class="nx">ALTER</span> <span class="nx">TABLE</span> <span class="nx">ci_sessions</span> <span class="nx">ADD</span> <span class="nx">PRIMARY</span> <span class="nx">KEY</span> <span class="p">(</span><span class="nx">id</span><span class="p">);</span>
|
|
|
|
<span class="c1">// To drop a previously created primary key (use when changing the setting)</span>
|
|
<span class="nx">ALTER</span> <span class="nx">TABLE</span> <span class="nx">ci_sessions</span> <span class="nx">DROP</span> <span class="nx">PRIMARY</span> <span class="nx">KEY</span><span class="p">;</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="admonition important">
|
|
<p class="first admonition-title">Important</p>
|
|
<p class="last">Only MySQL and PostgreSQL databases are officially
|
|
supported, due to lack of advisory locking mechanisms on other
|
|
platforms. Using sessions without locks can cause all sorts of
|
|
problems, especially with heavy usage of AJAX, and we will not
|
|
support such cases. Use <tt class="docutils literal"><span class="pre">session_write_close()</span></tt> after you’ve
|
|
done processing session data if you’re having performance
|
|
issues.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="redis-driver">
|
|
<h4><a class="toc-backref" href="#id20">Redis Driver</a><a class="headerlink" href="#redis-driver" title="Permalink to this headline">¶</a></h4>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">Since Redis doesn’t have a locking mechanism exposed, locks for
|
|
this driver are emulated by a separate value that is kept for up
|
|
to 300 seconds.</p>
|
|
</div>
|
|
<p>Redis is a storage engine typically used for caching and popular because
|
|
of its high performance, which is also probably your reason to use the
|
|
‘redis’ session driver.</p>
|
|
<p>The downside is that it is not as ubiquitous as relational databases and
|
|
requires the <a class="reference external" href="https://github.com/phpredis/phpredis">phpredis</a> PHP
|
|
extension to be installed on your system, and that one doesn’t come
|
|
bundled with PHP.
|
|
Chances are, you’re only be using the ‘redis’ driver only if you’re already
|
|
both familiar with Redis and using it for other purposes.</p>
|
|
<p>Just as with the ‘files’ and ‘database’ drivers, you must also configure
|
|
the storage location for your sessions via the
|
|
<tt class="docutils literal"><span class="pre">$config['sess_save_path']</span></tt> setting.
|
|
The format here is a bit different and complicated at the same time. It is
|
|
best explained by the <em>phpredis</em> extension’s README file, so we’ll simply
|
|
link you to it:</p>
|
|
<blockquote>
|
|
<div><a class="reference external" href="https://github.com/phpredis/phpredis#php-session-handler">https://github.com/phpredis/phpredis#php-session-handler</a></div></blockquote>
|
|
<div class="admonition warning">
|
|
<p class="first admonition-title">Warning</p>
|
|
<p class="last">CodeIgniter’s Session library does NOT use the actual ‘redis’
|
|
<tt class="docutils literal"><span class="pre">session.save_handler</span></tt>. Take note <strong>only</strong> of the path format in
|
|
the link above.</p>
|
|
</div>
|
|
<p>For the most common case however, a simple <tt class="docutils literal"><span class="pre">host:port</span></tt> pair should be
|
|
sufficient:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_driver'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'redis'</span><span class="p">;</span>
|
|
<span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_save_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'tcp://localhost:6379'</span><span class="p">;</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="memcached-driver">
|
|
<h4><a class="toc-backref" href="#id21">Memcached Driver</a><a class="headerlink" href="#memcached-driver" title="Permalink to this headline">¶</a></h4>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">Since Memcache doesn’t have a locking mechanism exposed, locks
|
|
for this driver are emulated by a separate value that is kept for
|
|
up to 300 seconds.</p>
|
|
</div>
|
|
<p>The ‘memcached’ driver is very similar to the ‘redis’ one in all of its
|
|
properties, except perhaps for availability, because PHP’s <a class="reference external" href="http://php.net/memcached">Memcached</a> extension is distributed via PECL and some
|
|
Linux distrubutions make it available as an easy to install package.</p>
|
|
<p>Other than that, and without any intentional bias towards Redis, there’s
|
|
not much different to be said about Memcached - it is also a popular
|
|
product that is usually used for caching and famed for its speed.</p>
|
|
<p>However, it is worth noting that the only guarantee given by Memcached
|
|
is that setting value X to expire after Y seconds will result in it being
|
|
deleted after Y seconds have passed (but not necessarily that it won’t
|
|
expire earlier than that time). This happens very rarely, but should be
|
|
considered as it may result in loss of sessions.</p>
|
|
<p>The <tt class="docutils literal"><span class="pre">$config['sess_save_path']</span></tt> format is fairly straightforward here,
|
|
being just a <tt class="docutils literal"><span class="pre">host:port</span></tt> pair:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_driver'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'memcached'</span><span class="p">;</span>
|
|
<span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_save_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'localhost:11211'</span><span class="p">;</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="section" id="id1">
|
|
<h5><a class="toc-backref" href="#id22">Bonus Tip</a><a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h5>
|
|
<p>Multi-server configuration with an optional <em>weight</em> parameter as the
|
|
third colon-separated (<tt class="docutils literal"><span class="pre">:weight</span></tt>) value is also supported, but we have
|
|
to note that we haven’t tested if that is reliable.</p>
|
|
<p>If you want to experiment with this feature (on your own risk), simply
|
|
separate the multiple server paths with commas:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// localhost will be given higher priority (5) here,</span>
|
|
<span class="c1">// compared to 192.0.2.1 with a weight of 1.</span>
|
|
<span class="nv">$config</span><span class="p">[</span><span class="s1">'sess_save_path'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'localhost:11211:5,192.0.2.1:11211:1'</span><span class="p">;</span>
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="custom-drivers">
|
|
<h4><a class="toc-backref" href="#id23">Custom Drivers</a><a class="headerlink" href="#custom-drivers" title="Permalink to this headline">¶</a></h4>
|
|
<p>You may also create your own, custom session drivers. However, have it in
|
|
mind that this is typically not an easy task, as it takes a lot of
|
|
knowledge to do it properly.</p>
|
|
<p>You need to know not only how sessions work in general, but also how they
|
|
work specifically in PHP, how the underlying storage mechanism works, how
|
|
to handle concurrency, avoid deadlocks (but NOT through lack of locks) and
|
|
last but not least - how to handle the potential security issues, which
|
|
is far from trivial.</p>
|
|
<p>Long story short - if you don’t know how to do that already in raw PHP,
|
|
you shouldn’t be trying to do it within CodeIgniter either. You’ve been
|
|
warned.</p>
|
|
<p>If you only want to add some extra functionality to your sessions, just
|
|
extend the base Session class, which is a lot more easier. Read the
|
|
<a class="reference internal" href="../general/creating_libraries.html"><em>Creating Libraries</em></a> article to
|
|
learn how to do that.</p>
|
|
<p>Now, to the point - there are three general rules that you must follow
|
|
when creating a session driver for CodeIgniter:</p>
|
|
<blockquote>
|
|
<div><ul>
|
|
<li><p class="first">Put your driver’s file under <strong>application/libraries/Session/drivers/</strong>
|
|
and follow the naming conventions used by the Session class.</p>
|
|
<p>For example, if you were to create a ‘dummy’ driver, you would have
|
|
a <tt class="docutils literal"><span class="pre">Session_dummy_driver</span></tt> class name, that is declared in
|
|
<em>application/libraries/Session/drivers/Session_dummy_driver.php</em>.</p>
|
|
</li>
|
|
<li><p class="first">Extend the <tt class="docutils literal"><span class="pre">CI_Session_driver</span></tt> class.</p>
|
|
<p>This is just a basic class with a few internal helper methods. It is
|
|
also extendable like any other library, if you really need to do that,
|
|
but we are not going to explain how ... if you’re familiar with how
|
|
class extensions/overrides work in CI, then you already know how to do
|
|
it. If not, well, you shouldn’t be doing it in the first place.</p>
|
|
</li>
|
|
<li><p class="first">Implement the <a class="reference external" href="http://php.net/sessionhandlerinterface">SessionHandlerInterface</a> interface.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">You may notice that <tt class="docutils literal"><span class="pre">SessionHandlerInterface</span></tt> is provided
|
|
by PHP since version 5.4.0. CodeIgniter will automatically declare
|
|
the same interface if you’re running an older PHP version.</p>
|
|
</div>
|
|
<p>The link will explain why and how.</p>
|
|
</li>
|
|
</ul>
|
|
</div></blockquote>
|
|
<p>So, based on our ‘dummy’ driver example above, you’d end up with something
|
|
like this:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// application/libraries/Session/drivers/Session_dummy_driver.php:</span>
|
|
|
|
<span class="k">class</span> <span class="nc">CI_Session_dummy_driver</span> <span class="k">extends</span> <span class="nx">CI_Session_driver</span> <span class="k">implements</span> <span class="nx">SessionHandlerInterface</span>
|
|
<span class="p">{</span>
|
|
|
|
<span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">(</span><span class="o">&</span><span class="nv">$params</span><span class="p">)</span>
|
|
<span class="p">{</span>
|
|
<span class="c1">// DO NOT forget this</span>
|
|
<span class="k">parent</span><span class="o">::</span><span class="na">__construct</span><span class="p">(</span><span class="nv">$params</span><span class="p">);</span>
|
|
|
|
<span class="c1">// Configuration & other initializations</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="k">public</span> <span class="k">function</span> <span class="nf">open</span><span class="p">(</span><span class="nv">$save_path</span><span class="p">,</span> <span class="nv">$name</span><span class="p">)</span>
|
|
<span class="p">{</span>
|
|
<span class="c1">// Initialize storage mechanism (connection)</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="k">public</span> <span class="k">function</span> <span class="nf">read</span><span class="p">(</span><span class="nv">$session_id</span><span class="p">)</span>
|
|
<span class="p">{</span>
|
|
<span class="c1">// Read session data (if exists), acquire locks</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="k">public</span> <span class="k">function</span> <span class="nf">write</span><span class="p">(</span><span class="nv">$session_id</span><span class="p">,</span> <span class="nv">$session_data</span><span class="p">)</span>
|
|
<span class="p">{</span>
|
|
<span class="c1">// Create / update session data (it might not exist!)</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="k">public</span> <span class="k">function</span> <span class="nf">close</span><span class="p">()</span>
|
|
<span class="p">{</span>
|
|
<span class="c1">// Free locks, close connections / streams / etc.</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="k">public</span> <span class="k">function</span> <span class="nf">destroy</span><span class="p">(</span><span class="nv">$session_id</span><span class="p">)</span>
|
|
<span class="p">{</span>
|
|
<span class="c1">// Call close() method & destroy data for current session (order may differ)</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="k">public</span> <span class="k">function</span> <span class="nf">gc</span><span class="p">(</span><span class="nv">$maxlifetime</span><span class="p">)</span>
|
|
<span class="p">{</span>
|
|
<span class="c1">// Erase data for expired sessions</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="p">}</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>If you’ve done everything properly, you can now set your <em>sess_driver</em>
|
|
configuration value to ‘dummy’ and use your own driver. Congratulations!</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="class-reference">
|
|
<h2><a class="toc-backref" href="#id24">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
|
|
<dl class="class">
|
|
<dt id="CI_Session">
|
|
<em class="property">class </em><tt class="descname">CI_Session</tt><a class="headerlink" href="#CI_Session" title="Permalink to this definition">¶</a></dt>
|
|
<dd><dl class="method">
|
|
<dt id="CI_Session::userdata">
|
|
<tt class="descname">userdata</tt><big>(</big><span class="optional">[</span><em>$key = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Session::userdata" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>mixed</em>) – Session item key or NULL</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Value of the specified item key, or an array of all userdata</p>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Gets the value for a specific <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> item, or an
|
|
array of all “userdata” items if not key was specified.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This is a legacy method kept only for backwards
|
|
compatibility with older applications. You should
|
|
directly access <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> instead.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::all_userdata">
|
|
<tt class="descname">all_userdata</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Session::all_userdata" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">An array of all userdata</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Returns an array containing all “userdata” items.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This method is DEPRECATED. Use <tt class="docutils literal"><span class="pre">userdata()</span></tt>
|
|
with no parameters instead.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt>
|
|
<tt class="descname">&get_userdata()</tt></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">A reference to <tt class="docutils literal"><span class="pre">$_SESSION</span></tt></td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Returns a reference to the <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> array.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This is a legacy method kept only for backwards
|
|
compatibility with older applications.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::has_userdata">
|
|
<tt class="descname">has_userdata</tt><big>(</big><em>$key</em><big>)</big><a class="headerlink" href="#CI_Session::has_userdata" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>string</em>) – Session item key</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the specified key exists, FALSE if not</p>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Checks if an item exists in <tt class="docutils literal"><span class="pre">$_SESSION</span></tt>.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This is a legacy method kept only for backwards
|
|
compatibility with older applications. It is just
|
|
an alias for <tt class="docutils literal"><span class="pre">isset($_SESSION[$key])</span></tt> - please
|
|
use that instead.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::set_userdata">
|
|
<tt class="descname">set_userdata</tt><big>(</big><em>$data</em><span class="optional">[</span>, <em>$value = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Session::set_userdata" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$data</strong> (<em>mixed</em>) – An array of key/value pairs to set as session data, or the key for a single item</li>
|
|
<li><strong>$value</strong> (<em>mixed</em>) – The value to set for a specific session item, if $data is a key</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Assigns data to the <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> superglobal.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This is a legacy method kept only for backwards
|
|
compatibility with older applications.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::unset_userdata">
|
|
<tt class="descname">unset_userdata</tt><big>(</big><em>$key</em><big>)</big><a class="headerlink" href="#CI_Session::unset_userdata" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>mixed</em>) – Key for the session data item to unset, or an array of multiple keys</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Unsets the specified key(s) from the <tt class="docutils literal"><span class="pre">$_SESSION</span></tt>
|
|
superglobal.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This is a legacy method kept only for backwards
|
|
compatibility with older applications. It is just
|
|
an alias for <tt class="docutils literal"><span class="pre">unset($_SESSION[$key])</span></tt> - please
|
|
use that instead.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::mark_as_flash">
|
|
<tt class="descname">mark_as_flash</tt><big>(</big><em>$key</em><big>)</big><a class="headerlink" href="#CI_Session::mark_as_flash" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>mixed</em>) – Key to mark as flashdata, or an array of multiple keys</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Marks a <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> item key (or multiple ones) as
|
|
“flashdata”.</p>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::get_flash_keys">
|
|
<tt class="descname">get_flash_keys</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Session::get_flash_keys" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Array containing the keys of all “flashdata” items.</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Gets a list of all <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> that have been marked as
|
|
“flashdata”.</p>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::unmark_flash">
|
|
<tt class="descname">unmark_flash</tt><big>(</big><em>$key</em><big>)</big><a class="headerlink" href="#CI_Session::unmark_flash" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>mixed</em>) – Key to be un-marked as flashdata, or an array of multiple keys</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Unmarks a <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> item key (or multiple ones) as
|
|
“flashdata”.</p>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::flashdata">
|
|
<tt class="descname">flashdata</tt><big>(</big><span class="optional">[</span><em>$key = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Session::flashdata" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>mixed</em>) – Flashdata item key or NULL</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Value of the specified item key, or an array of all flashdata</p>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Gets the value for a specific <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> item that has
|
|
been marked as “flashdata”, or an array of all “flashdata”
|
|
items if no key was specified.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This is a legacy method kept only for backwards
|
|
compatibility with older applications. You should
|
|
directly access <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> instead.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::keep_flashdata">
|
|
<tt class="descname">keep_flashdata</tt><big>(</big><em>$key</em><big>)</big><a class="headerlink" href="#CI_Session::keep_flashdata" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>mixed</em>) – Flashdata key to keep, or an array of multiple keys</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Retains the specified session data key(s) as “flashdata”
|
|
through the next request.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This is a legacy method kept only for backwards
|
|
compatibility with older applications. It is just
|
|
an alias for the <tt class="docutils literal"><span class="pre">mark_as_flash()</span></tt> method.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::set_flashdata">
|
|
<tt class="descname">set_flashdata</tt><big>(</big><em>$data</em><span class="optional">[</span>, <em>$value = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Session::set_flashdata" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$data</strong> (<em>mixed</em>) – An array of key/value pairs to set as flashdata, or the key for a single item</li>
|
|
<li><strong>$value</strong> (<em>mixed</em>) – The value to set for a specific session item, if $data is a key</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Assigns data to the <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> superglobal and marks it
|
|
as “flashdata”.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This is a legacy method kept only for backwards
|
|
compatibility with older applications.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::mark_as_temp">
|
|
<tt class="descname">mark_as_temp</tt><big>(</big><em>$key</em><span class="optional">[</span>, <em>$ttl = 300</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Session::mark_as_temp" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>mixed</em>) – Key to mark as tempdata, or an array of multiple keys</li>
|
|
<li><strong>$ttl</strong> (<em>int</em>) – Time-to-live value for the tempdata, in seconds</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Marks a <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> item key (or multiple ones) as
|
|
“tempdata”.</p>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::get_temp_keys">
|
|
<tt class="descname">get_temp_keys</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Session::get_temp_keys" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Array containing the keys of all “tempdata” items.</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Gets a list of all <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> that have been marked as
|
|
“tempdata”.</p>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::unmark_temp">
|
|
<tt class="descname">unmark_temp</tt><big>(</big><em>$key</em><big>)</big><a class="headerlink" href="#CI_Session::unmark_temp" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>mixed</em>) – Key to be un-marked as tempdata, or an array of multiple keys</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Unmarks a <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> item key (or multiple ones) as
|
|
“tempdata”.</p>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::tempdata">
|
|
<tt class="descname">tempdata</tt><big>(</big><span class="optional">[</span><em>$key = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Session::tempdata" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>mixed</em>) – Tempdata item key or NULL</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Value of the specified item key, or an array of all tempdata</p>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Gets the value for a specific <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> item that has
|
|
been marked as “tempdata”, or an array of all “tempdata”
|
|
items if no key was specified.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This is a legacy method kept only for backwards
|
|
compatibility with older applications. You should
|
|
directly access <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> instead.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::set_tempdata">
|
|
<tt class="descname">set_tempdata</tt><big>(</big><em>$data</em><span class="optional">[</span>, <em>$value = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Session::set_tempdata" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$data</strong> (<em>mixed</em>) – An array of key/value pairs to set as tempdata, or the key for a single item</li>
|
|
<li><strong>$value</strong> (<em>mixed</em>) – The value to set for a specific session item, if $data is a key</li>
|
|
<li><strong>$ttl</strong> (<em>int</em>) – Time-to-live value for the tempdata item(s), in seconds</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Assigns data to the <tt class="docutils literal"><span class="pre">$_SESSION</span></tt> superglobal and marks it
|
|
as “tempdata”.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This is a legacy method kept only for backwards
|
|
compatibility with older applications.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::sess_regenerate">
|
|
<tt class="descname">sess_regenerate</tt><big>(</big><span class="optional">[</span><em>$destroy = FALSE</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Session::sess_regenerate" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$destroy</strong> (<em>bool</em>) – Whether to destroy session data</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Regenerate session ID, optionally destroying the current
|
|
session’s data.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This method is just an alias for PHP’s native
|
|
<a class="reference external" href="http://php.net/session_regenerate_id">session_regenerate_id()</a> function.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::sess_destroy">
|
|
<tt class="descname">sess_destroy</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Session::sess_destroy" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">void</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Destroys the current session.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This must be the <em>last</em> session-related function
|
|
that you call. All session data will be lost after
|
|
you do that.</p>
|
|
</div>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">This method is just an alias for PHP’s native
|
|
<a class="reference external" href="http://php.net/session_destroy">session_destroy()</a> function.</p>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::__get">
|
|
<tt class="descname">__get</tt><big>(</big><em>$key</em><big>)</big><a class="headerlink" href="#CI_Session::__get" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>string</em>) – Session item key</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">The requested session data item, or NULL if it doesn’t exist</p>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>A magic method that allows you to use
|
|
<tt class="docutils literal"><span class="pre">$this->session->item</span></tt> instead of <tt class="docutils literal"><span class="pre">$_SESSION['item']</span></tt>,
|
|
if that’s what you prefer.</p>
|
|
<p>It will also return the session ID by calling
|
|
<tt class="docutils literal"><span class="pre">session_id()</span></tt> if you try to access
|
|
<tt class="docutils literal"><span class="pre">$this->session->session_id</span></tt>.</p>
|
|
</dd></dl>
|
|
|
|
<dl class="method">
|
|
<dt id="CI_Session::__set">
|
|
<tt class="descname">__set</tt><big>(</big><em>$key</em>, <em>$value</em><big>)</big><a class="headerlink" href="#CI_Session::__set" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
|
<li><strong>$key</strong> (<em>string</em>) – Session item key</li>
|
|
<li><strong>$value</strong> (<em>mixed</em>) – Value to assign to the session item key</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">void</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>A magic method that allows you to assign items to
|
|
<tt class="docutils literal"><span class="pre">$_SESSION</span></tt> by accessing them as <tt class="docutils literal"><span class="pre">$this->session</span></tt>
|
|
properties:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">session</span><span class="o">-></span><span class="na">foo</span> <span class="o">=</span> <span class="s1">'bar'</span><span class="p">;</span>
|
|
|
|
<span class="c1">// Results in:</span>
|
|
<span class="c1">// $_SESSION['foo'] = 'bar';</span>
|
|
</pre></div>
|
|
</div>
|
|
</dd></dl>
|
|
|
|
</dd></dl>
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