115 lines
5.3 KiB
HTML
115 lines
5.3 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Web Page Caching : CodeIgniter User Guide</title>
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<style type='text/css' media='all'>@import url('../userguide.css');</style>
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<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
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<script type="text/javascript" src="../nav/nav.js"></script>
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<script type="text/javascript" src="../nav/prototype.lite.js"></script>
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<script type="text/javascript" src="../nav/moo.fx.js"></script>
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<script type="text/javascript" src="../nav/user_guide_menu.js"></script>
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<meta http-equiv='expires' content='-1' />
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<meta http-equiv= 'pragma' content='no-cache' />
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<meta name='robots' content='all' />
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<meta name='author' content='ExpressionEngine Dev Team' />
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<meta name='description' content='CodeIgniter User Guide' />
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</head>
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<body>
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<!-- START NAVIGATION -->
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<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
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<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
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<div id="masthead">
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td><h1>CodeIgniter User Guide Version 2.1.3</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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</tr>
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</table>
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</div>
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<!-- END NAVIGATION -->
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<!-- START BREADCRUMB -->
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td id="breadcrumb">
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<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
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<a href="../index.html">User Guide Home</a> ›
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Page Caching
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</td>
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<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
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</tr>
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</table>
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<!-- END BREADCRUMB -->
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<br clear="all" />
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<!-- START CONTENT -->
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<div id="content">
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<h1>Web Page Caching</h1>
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<p>CodeIgniter lets you cache your pages in order to achieve maximum performance.</p>
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<p>Although CodeIgniter is quite fast, the amount of dynamic information you display in your pages will correlate directly to the
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server resources, memory, and processing cycles utilized, which affect your page load speeds.
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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>
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<h2>How Does Caching Work?</h2>
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<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.
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When a page is loaded for the first time, the cache file will be written to your <dfn>application/cache</dfn> folder. On subsequent page loads the cache file will be retrieved
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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>
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<p>Note: The Benchmark tag is not cached so you can still view your page load speed when caching is enabled.</p>
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<h2>Enabling Caching</h2>
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<p>To enable caching, put the following tag in any of your controller functions:</p>
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<code>$this->output->cache(<var>n</var>);</code>
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<p>Where <var>n</var> is the number of <strong>minutes</strong> you wish the page to remain cached between refreshes.</p>
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<p>The above tag can go anywhere within a function. It is not affected by the order that it appears, so place it wherever it seems
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most logical to you. Once the tag is in place, your pages will begin being cached.</p>
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<p class="important"><strong>Warning:</strong> Because of the way CodeIgniter stores content for output, caching will only work if you are generating display for your controller with a <a href="./views.html">view</a>.</p>
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<p class="important"><strong>Note:</strong> Before the cache files can be written you must set the file permissions on your
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<dfn>application/cache</dfn> folder such that it is writable.</p>
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<h2>Deleting Caches</h2>
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<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. Note:
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Removing the tag will not delete the cache immediately. It will have to expire normally. If you need to remove it earlier you
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will need to manually delete it from your cache folder.</p>
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</div>
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<!-- END CONTENT -->
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<div id="footer">
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<p>
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Previous Topic: <a href="errors.html">Error Handling</a>
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·
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<a href="#top">Top of Page</a> ·
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<a href="../index.html">User Guide Home</a> ·
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Next Topic: <a href="profiling.html">Profiling Your Application</a>
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</p>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2012 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
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</div>
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</body>
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</html>
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