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<li class="toctree-l2 current"><a class="current reference internal" href="">Creating Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="hooks.html">Hooks - Extending the Framework Core</a></li>
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<li class="toctree-l2"><a class="reference internal" href="alternative_php.html">Alternate PHP Syntax for View Files</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></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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<a href="../index.html" class="fa fa-home"> CodeIgniter</a>
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<li class="toctree-l1"><a class="reference internal" href="welcome.html">Welcome to CodeIgniter</a><ul class="simple">
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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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<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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<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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<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 class="current">
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">General Topics</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="urls.html">CodeIgniter URLs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="controllers.html">Controllers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="reserved_names.html">Reserved Names</a></li>
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<li class="toctree-l2"><a class="reference internal" href="views.html">Views</a></li>
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<li class="toctree-l2"><a class="reference internal" href="models.html">Models</a></li>
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<li class="toctree-l2"><a class="reference internal" href="helpers.html">Helpers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="libraries.html">Using CodeIgniter Libraries</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="">Creating Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="drivers.html">Using CodeIgniter Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="creating_drivers.html">Creating Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="core_classes.html">Creating Core System Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="ancillary_classes.html">Creating Ancillary Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="hooks.html">Hooks - Extending the Framework Core</a></li>
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<li class="toctree-l2"><a class="reference internal" href="autoloader.html">Auto-loading Resources</a></li>
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<li class="toctree-l2"><a class="reference internal" href="common_functions.html">Common Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="compatibility_functions.html">Compatibility Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="routing.html">URI Routing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="errors.html">Error Handling</a></li>
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<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="profiling.html">Profiling Your Application</a></li>
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<li class="toctree-l2"><a class="reference internal" href="cli.html">Running via the CLI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="managing_apps.html">Managing your Applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="environments.html">Handling Multiple Environments</a></li>
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<li class="toctree-l2"><a class="reference internal" href="alternative_php.html">Alternate PHP Syntax for View Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="security.html">Security</a></li>
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<li class="toctree-l2"><a class="reference internal" href="styleguide.html">PHP Style Guide</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/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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</ul>
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<a href="../index.html">CodeIgniter</a>
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</nav>
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<ul class="wy-breadcrumbs">
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<li><a href="../index.html">Docs</a> »</li>
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<li><a href="index.html">General Topics</a> »</li>
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<li>Creating Libraries</li>
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<li class="wy-breadcrumbs-aside">
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<div style="float:right;margin-left:5px;" id="closeMe">
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<img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" />
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<hr/>
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</div>
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<div role="main" class="document">
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<div class="section" id="creating-libraries">
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<h1>Creating Libraries<a class="headerlink" href="#creating-libraries" title="Permalink to this headline">¶</a></h1>
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<p>When we use the term “Libraries” we are normally referring to the
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classes that are located in the libraries directory and described in the
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Class Reference of this user guide. In this case, however, we will
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instead describe how you can create your own libraries within your
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application/libraries directory in order to maintain separation between
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your local resources and the global framework resources.</p>
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<p>As an added bonus, CodeIgniter permits your libraries to extend native
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classes if you simply need to add some functionality to an existing
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library. Or you can even replace native libraries just by placing
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identically named versions in your <em>application/libraries</em> directory.</p>
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<p>In summary:</p>
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<ul class="simple">
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|
<li>You can create entirely new libraries.</li>
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<li>You can extend native libraries.</li>
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<li>You can replace native libraries.</li>
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</ul>
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<p>The page below explains these three concepts in detail.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">The Database classes can not be extended or replaced with your
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own classes. All other classes are able to be replaced/extended.</p>
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</div>
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<div class="section" id="storage">
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<h2>Storage<a class="headerlink" href="#storage" title="Permalink to this headline">¶</a></h2>
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<p>Your library classes should be placed within your <em>application/libraries</em>
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directory, as this is where CodeIgniter will look for them when they are
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initialized.</p>
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</div>
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<div class="section" id="naming-conventions">
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<h2>Naming Conventions<a class="headerlink" href="#naming-conventions" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li>File names must be capitalized. For example: Myclass.php</li>
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<li>Class declarations must be capitalized. For example: class Myclass</li>
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<li>Class names and file names must match.</li>
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</ul>
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</div>
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<div class="section" id="the-class-file">
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<h2>The Class File<a class="headerlink" href="#the-class-file" title="Permalink to this headline">¶</a></h2>
|
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<p>Classes should have this basic prototype:</p>
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|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
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<span class="nb">defined</span><span class="p">(</span><span class="s1">'BASEPATH'</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">'No direct script access allowed'</span><span class="p">);</span>
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<span class="k">class</span> <span class="nc">Someclass</span> <span class="p">{</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">some_method</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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|
<div class="admonition note">
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|
<p class="first admonition-title">Note</p>
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|
<p class="last">We are using the name Someclass purely as an example.</p>
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</div>
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</div>
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<div class="section" id="using-your-class">
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|
<h2>Using Your Class<a class="headerlink" href="#using-your-class" title="Permalink to this headline">¶</a></h2>
|
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|
<p>From within any of your <a class="reference internal" href="controllers.html"><em>Controller</em></a> methods you
|
|
|
can initialize your class using the standard:</p>
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|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'someclass'</span><span class="p">);</span>
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</pre></div>
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</div>
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<p>Where <em>someclass</em> is the file name, without the ”.php” file extension.
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|
You can submit the file name capitalized or lower case. CodeIgniter
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|
doesn’t care.</p>
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|
<p>Once loaded you can access your class using the lower case version:</p>
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|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">someclass</span><span class="o">-></span><span class="na">some_method</span><span class="p">();</span><span class="nx"> </span> <span class="c1">// Object instances will always be lower case</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="passing-parameters-when-initializing-your-class">
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|
<h2>Passing Parameters When Initializing Your Class<a class="headerlink" href="#passing-parameters-when-initializing-your-class" title="Permalink to this headline">¶</a></h2>
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<p>In the library loading method you can dynamically pass data as an
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|
array via the second parameter and it will be passed to your class
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|
constructor:</p>
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|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$params</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'large'</span><span class="p">,</span> <span class="s1">'color'</span> <span class="o">=></span> <span class="s1">'red'</span><span class="p">);</span>
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|
<span class="nv">$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">'someclass'</span><span class="p">,</span> <span class="nv">$params</span><span class="p">);</span>
|
|
|
</pre></div>
|
|
|
</div>
|
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|
<p>If you use this feature you must set up your class constructor to expect
|
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|
data:</p>
|
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span> <span class="nb">defined</span><span class="p">(</span><span class="s1">'BASEPATH'</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">'No direct script access allowed'</span><span class="p">);</span>
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|
|
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|
<span class="k">class</span> <span class="nc">Someclass</span> <span class="p">{</span>
|
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|
|
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|
<span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">(</span><span class="nv">$params</span><span class="p">)</span>
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|
|
<span class="p">{</span>
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|
<span class="c1">// Do something with $params</span>
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|
|
<span class="p">}</span>
|
|
|
<span class="p">}</span>
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|
</pre></div>
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|
</div>
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|
<p>You can also pass parameters stored in a config file. Simply create a
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|
|
config file named identically to the class file name and store it in
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|
your <em>application/config/</em> directory. Note that if you dynamically pass
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|
|
parameters as described above, the config file option will not be
|
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|
available.</p>
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|
|
</div>
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|
|
<div class="section" id="utilizing-codeigniter-resources-within-your-library">
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|
|
<h2>Utilizing CodeIgniter Resources within Your Library<a class="headerlink" href="#utilizing-codeigniter-resources-within-your-library" title="Permalink to this headline">¶</a></h2>
|
|
|
<p>To access CodeIgniter’s native resources within your library use the
|
|
|
<tt class="docutils literal"><span class="pre">get_instance()</span></tt> method. This method returns the CodeIgniter super
|
|
|
object.</p>
|
|
|
<p>Normally from within your controller methods you will call any of the
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|
|
available CodeIgniter methods using the <tt class="docutils literal"><span class="pre">$this</span></tt> construct:</p>
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|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url'</span><span class="p">);</span>
|
|
|
<span class="nv">$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>
|
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">config</span><span class="o">-></span><span class="na">item</span><span class="p">(</span><span class="s1">'base_url'</span><span class="p">);</span>
|
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|
<span class="c1">// etc.</span>
|
|
|
</pre></div>
|
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|
</div>
|
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|
<p><tt class="docutils literal"><span class="pre">$this</span></tt>, however, only works directly within your controllers, your
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|
|
models, or your views. If you would like to use CodeIgniter’s classes
|
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|
from within your own custom classes you can do so as follows:</p>
|
|
|
<p>First, assign the CodeIgniter object to a variable:</p>
|
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&</span> <span class="nx">get_instance</span><span class="p">();</span>
|
|
|
</pre></div>
|
|
|
</div>
|
|
|
<p>Once you’ve assigned the object to a variable, you’ll use that variable
|
|
|
<em>instead</em> of <tt class="docutils literal"><span class="pre">$this</span></tt>:</p>
|
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&</span> <span class="nx">get_instance</span><span class="p">();</span>
|
|
|
|
|
|
<span class="nv">$CI</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url'</span><span class="p">);</span>
|
|
|
<span class="nv">$CI</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'session'</span><span class="p">);</span>
|
|
|
<span class="nv">$CI</span><span class="o">-></span><span class="na">config</span><span class="o">-></span><span class="na">item</span><span class="p">(</span><span class="s1">'base_url'</span><span class="p">);</span>
|
|
|
<span class="c1">// etc.</span>
|
|
|
</pre></div>
|
|
|
</div>
|
|
|
<div class="admonition note">
|
|
|
<p class="first admonition-title">Note</p>
|
|
|
<p>You’ll notice that the above <tt class="docutils literal"><span class="pre">get_instance()</span></tt> function is being
|
|
|
passed by reference:</p>
|
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&</span> <span class="nx">get_instance</span><span class="p">();</span>
|
|
|
</pre></div>
|
|
|
</div>
|
|
|
<p class="last">This is very important. Assigning by reference allows you to use the
|
|
|
original CodeIgniter object rather than creating a copy of it.</p>
|
|
|
</div>
|
|
|
<p>However, since a library is a class, it would be better if you
|
|
|
take full advantage of the OOP principles. So, in order to
|
|
|
be able to use the CodeIgniter super-object in all of the class
|
|
|
methods, you’re encouraged to assign it to a property instead:</p>
|
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Example_library</span> <span class="p">{</span>
|
|
|
|
|
|
<span class="k">protected</span> <span class="nv">$CI</span><span class="p">;</span>
|
|
|
|
|
|
<span class="c1">// We'll use a constructor, as you can't directly call a function</span>
|
|
|
<span class="c1">// from a property definition.</span>
|
|
|
<span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">()</span>
|
|
|
<span class="p">{</span>
|
|
|
<span class="c1">// Assign the CodeIgniter super-object</span>
|
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">CI</span> <span class="o">=&</span> <span class="nx">get_instance</span><span class="p">();</span>
|
|
|
<span class="p">}</span>
|
|
|
|
|
|
<span class="k">public</span> <span class="k">function</span> <span class="nf">foo</span><span class="p">()</span>
|
|
|
<span class="p">{</span>
|
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">CI</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url'</span><span class="p">);</span>
|
|
|
<span class="nx">redirect</span><span class="p">();</span>
|
|
|
<span class="p">}</span>
|
|
|
|
|
|
<span class="k">public</span> <span class="k">function</span> <span class="nf">bar</span><span class="p">()</span>
|
|
|
<span class="p">{</span>
|
|
|
<span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">CI</span><span class="o">-></span><span class="na">config</span><span class="o">-></span><span class="na">item</span><span class="p">(</span><span class="s1">'base_url'</span><span class="p">);</span>
|
|
|
<span class="p">}</span>
|
|
|
|
|
|
<span class="p">}</span>
|
|
|
</pre></div>
|
|
|
</div>
|
|
|
</div>
|
|
|
<div class="section" id="replacing-native-libraries-with-your-versions">
|
|
|
<h2>Replacing Native Libraries with Your Versions<a class="headerlink" href="#replacing-native-libraries-with-your-versions" title="Permalink to this headline">¶</a></h2>
|
|
|
<p>Simply by naming your class files identically to a native library will
|
|
|
cause CodeIgniter to use it instead of the native one. To use this
|
|
|
feature you must name the file and the class declaration exactly the
|
|
|
same as the native library. For example, to replace the native Email
|
|
|
library you’ll create a file named <em>application/libraries/Email.php</em>,
|
|
|
and declare your class with:</p>
|
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">CI_Email</span> <span class="p">{</span>
|
|
|
|
|
|
<span class="p">}</span>
|
|
|
</pre></div>
|
|
|
</div>
|
|
|
<p>Note that most native classes are prefixed with CI_.</p>
|
|
|
<p>To load your library you’ll see the standard loading method:</p>
|
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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">'email'</span><span class="p">);</span>
|
|
|
</pre></div>
|
|
|
</div>
|
|
|
<div class="admonition note">
|
|
|
<p class="first admonition-title">Note</p>
|
|
|
<p class="last">At this time the Database classes can not be replaced with
|
|
|
your own versions.</p>
|
|
|
</div>
|
|
|
</div>
|
|
|
<div class="section" id="extending-native-libraries">
|
|
|
<h2>Extending Native Libraries<a class="headerlink" href="#extending-native-libraries" title="Permalink to this headline">¶</a></h2>
|
|
|
<p>If all you need to do is add some functionality to an existing library -
|
|
|
perhaps add a method or two - then it’s overkill to replace the entire
|
|
|
library with your version. In this case it’s better to simply extend the
|
|
|
class. Extending a class is nearly identical to replacing a class with a
|
|
|
couple exceptions:</p>
|
|
|
<ul class="simple">
|
|
|
<li>The class declaration must extend the parent class.</li>
|
|
|
<li>Your new class name and filename must be prefixed with MY_ (this
|
|
|
item is configurable. See below.).</li>
|
|
|
</ul>
|
|
|
<p>For example, to extend the native Email class you’ll create a file named
|
|
|
<em>application/libraries/MY_Email.php</em>, and declare your class with:</p>
|
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">MY_Email</span> <span class="k">extends</span> <span class="nx">CI_Email</span> <span class="p">{</span>
|
|
|
|
|
|
<span class="p">}</span>
|
|
|
</pre></div>
|
|
|
</div>
|
|
|
<p>If you need to use a constructor in your class make sure you
|
|
|
extend the parent constructor:</p>
|
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">MY_Email</span> <span class="k">extends</span> <span class="nx">CI_Email</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="nv">$config</span> <span class="o">=</span> <span class="k">array</span><span class="p">())</span>
|
|
|
<span class="p">{</span>
|
|
|
<span class="k">parent</span><span class="o">::</span><span class="na">__construct</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
|
|
|
<span class="p">}</span>
|
|
|
|
|
|
<span class="p">}</span>
|
|
|
</pre></div>
|
|
|
</div>
|
|
|
<div class="admonition note">
|
|
|
<p class="first admonition-title">Note</p>
|
|
|
<p class="last">Not all of the libraries have the same (or any) parameters
|
|
|
in their constructor. Take a look at the library that you’re
|
|
|
extending first to see how it should be implemented.</p>
|
|
|
</div>
|
|
|
<div class="section" id="loading-your-sub-class">
|
|
|
<h3>Loading Your Sub-class<a class="headerlink" href="#loading-your-sub-class" title="Permalink to this headline">¶</a></h3>
|
|
|
<p>To load your sub-class you’ll use the standard syntax normally used. DO
|
|
|
NOT include your prefix. For example, to load the example above, which
|
|
|
extends the Email class, you will use:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'email'</span><span class="p">);</span>
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</pre></div>
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</div>
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<p>Once loaded you will use the class variable as you normally would for
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the class you are extending. In the case of the email class all calls
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will use:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">email</span><span class="o">-></span><span class="na">some_method</span><span class="p">();</span>
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</pre></div>
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</div>
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<div class="section" id="setting-your-own-prefix">
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<h3>Setting Your Own Prefix<a class="headerlink" href="#setting-your-own-prefix" title="Permalink to this headline">¶</a></h3>
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<p>To set your own sub-class prefix, open your
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<em>application/config/config.php</em> file and look for this item:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'subclass_prefix'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'MY_'</span><span class="p">;</span>
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</pre></div>
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</div>
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<p>Please note that all native CodeIgniter libraries are prefixed with CI_
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so DO NOT use that as your prefix.</p>
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