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564 lines
37 KiB
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<!DOCTYPE html>
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<title>Web Page Caching — CodeIgniter 3.1.4 documentation</title>
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<link rel="top" title="CodeIgniter 3.1.4 documentation" href="../index.html"/>
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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/conclusion.html">Conclusion</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="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="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 current"><a class="current reference internal" href="">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-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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</li>
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</ul>
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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/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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<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="../helpers/xml_helper.html">XML Helper</a></li>
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<li><a href="index.html">General Topics</a> »</li>
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<hr/>
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<div role="main" class="document">
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<div class="section" id="web-page-caching">
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<h1>Web Page Caching<a class="headerlink" href="#web-page-caching" title="Permalink to this headline">¶</a></h1>
|
|
<p>CodeIgniter lets you cache your pages in order to achieve maximum
|
|
performance.</p>
|
|
<p>Although CodeIgniter is quite fast, the amount of dynamic information
|
|
you display in your pages will correlate directly to the server
|
|
resources, memory, and processing cycles utilized, which affect your
|
|
page load speeds. By caching your pages, since they are saved in their
|
|
fully rendered state, you can achieve performance that nears that of
|
|
static web pages.</p>
|
|
<div class="section" id="how-does-caching-work">
|
|
<h2>How Does Caching Work?<a class="headerlink" href="#how-does-caching-work" title="Permalink to this headline">¶</a></h2>
|
|
<p>Caching can be enabled on a per-page basis, and you can set the length
|
|
of time that a page should remain cached before being refreshed. When a
|
|
page is loaded for the first time, the cache file will be written to
|
|
your application/cache folder. On subsequent page loads the cache file
|
|
will be retrieved and sent to the requesting user’s browser. If it has
|
|
expired, it will be deleted and refreshed before being sent to the
|
|
browser.</p>
|
|
</div>
|
|
<div class="section" id="enabling-caching">
|
|
<h2>Enabling Caching<a class="headerlink" href="#enabling-caching" title="Permalink to this headline">¶</a></h2>
|
|
<p>To enable caching, put the following tag in any of your controller
|
|
methods:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">output</span><span class="o">-></span><span class="na">cache</span><span class="p">(</span><span class="nv">$n</span><span class="p">);</span>
|
|
</pre></div>
|
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</div>
|
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<p>Where <tt class="docutils literal"><span class="pre">$n</span></tt> is the number of <strong>minutes</strong> you wish the page to remain
|
|
cached between refreshes.</p>
|
|
<p>The above tag can go anywhere within a method. It is not affected by
|
|
the order that it appears, so place it wherever it seems most logical to
|
|
you. Once the tag is in place, your pages will begin being cached.</p>
|
|
<div class="admonition important">
|
|
<p class="first admonition-title">Important</p>
|
|
<p class="last">Because of the way CodeIgniter stores content for output,
|
|
caching will only work if you are generating display for your
|
|
controller with a <a class="reference internal" href="views.html"><em>view</em></a>.</p>
|
|
</div>
|
|
<div class="admonition important">
|
|
<p class="first admonition-title">Important</p>
|
|
<p class="last">If you change configuration options that might affect
|
|
your output, you have to manually delete your cache files.</p>
|
|
</div>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">Before the cache files can be written you must set the file
|
|
permissions on your <em>application/cache/</em> directory such that
|
|
it is writable.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="deleting-caches">
|
|
<h2>Deleting Caches<a class="headerlink" href="#deleting-caches" title="Permalink to this headline">¶</a></h2>
|
|
<p>If you no longer wish to cache a file you can remove the caching tag and
|
|
it will no longer be refreshed when it expires.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">Removing the tag will not delete the cache immediately. It will
|
|
have to expire normally.</p>
|
|
</div>
|
|
<p>If you need to manually delete the cache, you can use the <tt class="docutils literal"><span class="pre">delete_cache()</span></tt>
|
|
method:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Deletes cache for the currently requested URI</span>
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">output</span><span class="o">-></span><span class="na">delete_cache</span><span class="p">();</span>
|
|
|
|
<span class="c1">// Deletes cache for /foo/bar</span>
|
|
<span class="nv">$this</span><span class="o">-></span><span class="na">output</span><span class="o">-></span><span class="na">delete_cache</span><span class="p">(</span><span class="s1">'/foo/bar'</span><span class="p">);</span>
|
|
</pre></div>
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</div>
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</div>
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</div>
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<footer>
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