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265<li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li>
266<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
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285<li class="toctree-l2"><a class="reference internal" href="libraries.html">Using CodeIgniter Libraries</a></li>
286<li class="toctree-l2"><a class="reference internal" href="creating_libraries.html">Creating Libraries</a></li>
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312<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
313<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
314<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
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317<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
318<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
319<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
320<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
321<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
322<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
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336<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
337<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
338<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
339<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
340</ul>
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348<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
349<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
350<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
351<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
352<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
353<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
354<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
355<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
356<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
357<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
358<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
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367<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
368<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
369<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
370<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
371<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
372<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
373<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
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382<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
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424
425 <div class="section" id="web-page-caching">
426<h1>Web Page Caching<a class="headerlink" href="#web-page-caching" title="Permalink to this headline"></a></h1>
427<p>CodeIgniter lets you cache your pages in order to achieve maximum
428performance.</p>
429<p>Although CodeIgniter is quite fast, the amount of dynamic information
430you display in your pages will correlate directly to the server
431resources, memory, and processing cycles utilized, which affect your
432page load speeds. By caching your pages, since they are saved in their
433fully rendered state, you can achieve performance that nears that of
434static web pages.</p>
435<div class="section" id="how-does-caching-work">
436<h2>How Does Caching Work?<a class="headerlink" href="#how-does-caching-work" title="Permalink to this headline"></a></h2>
437<p>Caching can be enabled on a per-page basis, and you can set the length
438of time that a page should remain cached before being refreshed. When a
439page is loaded for the first time, the cache file will be written to
440your application/cache folder. On subsequent page loads the cache file
441will be retrieved and sent to the requesting user’s browser. If it has
442expired, it will be deleted and refreshed before being sent to the
443browser.</p>
444</div>
445<div class="section" id="enabling-caching">
446<h2>Enabling Caching<a class="headerlink" href="#enabling-caching" title="Permalink to this headline"></a></h2>
447<p>To enable caching, put the following tag in any of your controller
448methods:</p>
449<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">output</span><span class="o">-&gt;</span><span class="na">cache</span><span class="p">(</span><span class="nv">$n</span><span class="p">);</span>
450</pre></div>
451</div>
452<p>Where <code class="docutils literal"><span class="pre">$n</span></code> is the number of <strong>minutes</strong> you wish the page to remain
453cached between refreshes.</p>
454<p>The above tag can go anywhere within a method. It is not affected by
455the order that it appears, so place it wherever it seems most logical to
456you. Once the tag is in place, your pages will begin being cached.</p>
457<div class="admonition important">
458<p class="first admonition-title">Important</p>
459<p class="last">Because of the way CodeIgniter stores content for output,
460caching will only work if you are generating display for your
461controller with a <a class="reference internal" href="views.html"><span class="doc">view</span></a>.</p>
462</div>
463<div class="admonition important">
464<p class="first admonition-title">Important</p>
465<p class="last">If you change configuration options that might affect
466your output, you have to manually delete your cache files.</p>
467</div>
468<div class="admonition note">
469<p class="first admonition-title">Note</p>
470<p class="last">Before the cache files can be written you must set the file
471permissions on your <em>application/cache/</em> directory such that
472it is writable.</p>
473</div>
474</div>
475<div class="section" id="deleting-caches">
476<h2>Deleting Caches<a class="headerlink" href="#deleting-caches" title="Permalink to this headline"></a></h2>
477<p>If you no longer wish to cache a file you can remove the caching tag and
478it will no longer be refreshed when it expires.</p>
479<div class="admonition note">
480<p class="first admonition-title">Note</p>
481<p class="last">Removing the tag will not delete the cache immediately. It will
482have to expire normally.</p>
483</div>
484<p>If you need to manually delete the cache, you can use the <code class="docutils literal"><span class="pre">delete_cache()</span></code>
485method:</p>
486<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Deletes cache for the currently requested URI</span>
487<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">output</span><span class="o">-&gt;</span><span class="na">delete_cache</span><span class="p">();</span>
488
489<span class="c1">// Deletes cache for /foo/bar</span>
490<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">output</span><span class="o">-&gt;</span><span class="na">delete_cache</span><span class="p">(</span><span class="s1">&#39;/foo/bar&#39;</span><span class="p">);</span>
491</pre></div>
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