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- <div class="section" id="web-page-caching">
-<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&#8217;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">$this</span><span class="o">-&gt;</span><span class="na">output</span><span class="o">-&gt;</span><span class="na">cache</span><span class="p">(</span><span class="nv">$n</span><span class="p">);</span>
-</pre></div>
-</div>
-<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">-&gt;</span><span class="na">output</span><span class="o">-&gt;</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">-&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>
-</pre></div>
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