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286<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
287<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
288<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
289<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
290<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
291<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
292<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
293<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
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295<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
296<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
297<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
298<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
299<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
300<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
301<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
302<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
303<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
304<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
305</ul>
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310<li class="toctree-l2"><a class="reference internal" href="benchmark.html">Benchmarking Class</a></li>
311<li class="toctree-l2 current"><a class="current reference internal" href="#">Caching Driver</a></li>
312<li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li>
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318<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
319<li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li>
320<li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li>
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337<li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li>
338<li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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340</ul>
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342</ul>
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344<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><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>
359</ul>
360</li>
361</ul>
362<ul>
363<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
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365<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
366<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
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>
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380<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
381<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
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383<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
384<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
385</ul>
386</li>
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388
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397
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412
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423 <div role="main" class="document">
424
425 <div class="section" id="caching-driver">
426<h1>Caching Driver<a class="headerlink" href="#caching-driver" title="Permalink to this headline"></a></h1>
427<p>CodeIgniter features wrappers around some of the most popular forms of
428fast and dynamic caching. All but file-based caching require specific
429server requirements, and a Fatal Exception will be thrown if server
430requirements are not met.</p>
431<div class="contents local topic" id="contents">
432<ul class="simple">
433<li><a class="reference internal" href="#example-usage" id="id1">Example Usage</a></li>
434<li><a class="reference internal" href="#class-reference" id="id2">Class Reference</a></li>
435<li><a class="reference internal" href="#drivers" id="id3">Drivers</a><ul>
436<li><a class="reference internal" href="#alternative-php-cache-apc-caching" id="id4">Alternative PHP Cache (APC) Caching</a></li>
437<li><a class="reference internal" href="#file-based-caching" id="id5">File-based Caching</a></li>
438<li><a class="reference internal" href="#memcached-caching" id="id6">Memcached Caching</a></li>
439<li><a class="reference internal" href="#wincache-caching" id="id7">WinCache Caching</a></li>
440<li><a class="reference internal" href="#redis-caching" id="id8">Redis Caching</a></li>
441<li><a class="reference internal" href="#dummy-cache" id="id9">Dummy Cache</a></li>
442</ul>
443</li>
444</ul>
445</div>
446<div class="custom-index container"></div><div class="section" id="example-usage">
447<h2><a class="toc-backref" href="#id1">Example Usage</a><a class="headerlink" href="#example-usage" title="Permalink to this headline"></a></h2>
448<p>The following example will load the cache driver, specify <a class="reference external" href="#alternative-php-cache-apc-caching">APC</a>
449as the driver to use, and fall back to file-based caching if APC is not
450available in the hosting environment.</p>
451<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">,</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;adapter&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;apc&#39;</span><span class="p">,</span> <span class="s1">&#39;backup&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;file&#39;</span><span class="p">));</span>
452
453<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$foo</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">))</span>
454<span class="p">{</span>
455 <span class="k">echo</span> <span class="s1">&#39;Saving to the cache!&lt;br /&gt;&#39;</span><span class="p">;</span>
456 <span class="nv">$foo</span> <span class="o">=</span> <span class="s1">&#39;foobarbaz!&#39;</span><span class="p">;</span>
457
458 <span class="c1">// Save into the cache for 5 minutes</span>
459 <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="nv">$foo</span><span class="p">,</span> <span class="mi">300</span><span class="p">);</span>
460<span class="p">}</span>
461
462<span class="k">echo</span> <span class="nv">$foo</span><span class="p">;</span>
463</pre></div>
464</div>
465<p>You can also prefix cache item names via the <strong>key_prefix</strong> setting, which is useful
466to avoid collisions when you’re running multiple applications on the same environment.</p>
467<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">,</span>
468 <span class="k">array</span><span class="p">(</span><span class="s1">&#39;adapter&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;apc&#39;</span><span class="p">,</span> <span class="s1">&#39;backup&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;file&#39;</span><span class="p">,</span> <span class="s1">&#39;key_prefix&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;my_&#39;</span><span class="p">)</span>
469<span class="p">);</span>
470
471<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">);</span> <span class="c1">// Will get the cache entry named &#39;my_foo&#39;</span>
472</pre></div>
473</div>
474</div>
475<div class="section" id="class-reference">
476<h2><a class="toc-backref" href="#id2">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline"></a></h2>
477<dl class="class">
478<dt id="CI_Cache">
479<em class="property">class </em><code class="descname">CI_Cache</code><a class="headerlink" href="#CI_Cache" title="Permalink to this definition"></a></dt>
480<dd><dl class="method">
481<dt id="CI_Cache::is_supported">
482<code class="descname">is_supported</code><span class="sig-paren">(</span><em>$driver</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::is_supported" title="Permalink to this definition"></a></dt>
483<dd><table class="docutils field-list" frame="void" rules="none">
484<col class="field-name" />
485<col class="field-body" />
486<tbody valign="top">
487<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
488<li><strong>$driver</strong> (<em>string</em>) – the name of the caching driver</li>
489</ul>
490</td>
491</tr>
492<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if supported, FALSE if not</p>
493</td>
494</tr>
495<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
496</td>
497</tr>
498</tbody>
499</table>
500<p>This method is automatically called when accessing drivers via
501<code class="docutils literal"><span class="pre">$this-&gt;cache-&gt;get()</span></code>. However, if the individual drivers are used,
502make sure to call this method to ensure the driver is supported in the
503hosting environment.</p>
504<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">apc</span><span class="o">-&gt;</span><span class="na">is_supported</span><span class="p">())</span>
505<span class="p">{</span>
506 <span class="k">if</span> <span class="p">(</span><span class="nv">$data</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">apc</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;my_cache&#39;</span><span class="p">))</span>
507 <span class="p">{</span>
508 <span class="c1">// do things.</span>
509 <span class="p">}</span>
510<span class="p">}</span>
511</pre></div>
512</div>
513</dd></dl>
514
515<dl class="method">
516<dt id="CI_Cache::get">
517<code class="descname">get</code><span class="sig-paren">(</span><em>$id</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::get" title="Permalink to this definition"></a></dt>
518<dd><table class="docutils field-list" frame="void" rules="none">
519<col class="field-name" />
520<col class="field-body" />
521<tbody valign="top">
522<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
523<li><strong>$id</strong> (<em>string</em>) – Cache item name</li>
524</ul>
525</td>
526</tr>
527<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Item value or FALSE if not found</p>
528</td>
529</tr>
530<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
531</td>
532</tr>
533</tbody>
534</table>
535<p>This method will attempt to fetch an item from the cache store. If the
536item does not exist, the method will return FALSE.</p>
537<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$foo</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;my_cached_item&#39;</span><span class="p">);</span>
538</pre></div>
539</div>
540</dd></dl>
541
542<dl class="method">
543<dt id="CI_Cache::save">
544<code class="descname">save</code><span class="sig-paren">(</span><em>$id</em>, <em>$data</em><span class="optional">[</span>, <em>$ttl = 60</em><span class="optional">[</span>, <em>$raw = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::save" title="Permalink to this definition"></a></dt>
545<dd><table class="docutils field-list" frame="void" rules="none">
546<col class="field-name" />
547<col class="field-body" />
548<tbody valign="top">
549<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
550<li><strong>$id</strong> (<em>string</em>) – Cache item name</li>
551<li><strong>$data</strong> (<em>mixed</em>) – the data to save</li>
552<li><strong>$ttl</strong> (<em>int</em>) – Time To Live, in seconds (default 60)</li>
553<li><strong>$raw</strong> (<em>bool</em>) – Whether to store the raw value</li>
554</ul>
555</td>
556</tr>
557<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
558</td>
559</tr>
560<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
561</td>
562</tr>
563</tbody>
564</table>
565<p>This method will save an item to the cache store. If saving fails, the
566method will return FALSE.</p>
567<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;cache_item_id&#39;</span><span class="p">,</span> <span class="s1">&#39;data_to_cache&#39;</span><span class="p">);</span>
568</pre></div>
569</div>
570<div class="admonition note">
571<p class="first admonition-title">Note</p>
572<p class="last">The <code class="docutils literal"><span class="pre">$raw</span></code> parameter is only utilized by APC and Memcache,
573in order to allow usage of <code class="docutils literal"><span class="pre">increment()</span></code> and <code class="docutils literal"><span class="pre">decrement()</span></code>.</p>
574</div>
575</dd></dl>
576
577<dl class="method">
578<dt id="CI_Cache::delete">
579<code class="descname">delete</code><span class="sig-paren">(</span><em>$id</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::delete" title="Permalink to this definition"></a></dt>
580<dd><table class="docutils field-list" frame="void" rules="none">
581<col class="field-name" />
582<col class="field-body" />
583<tbody valign="top">
584<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
585<li><strong>$id</strong> (<em>string</em>) – name of cached item</li>
586</ul>
587</td>
588</tr>
589<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
590</td>
591</tr>
592<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
593</td>
594</tr>
595</tbody>
596</table>
597<p>This method will delete a specific item from the cache store. If item
598deletion fails, the method will return FALSE.</p>
599<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">delete</span><span class="p">(</span><span class="s1">&#39;cache_item_id&#39;</span><span class="p">);</span>
600</pre></div>
601</div>
602</dd></dl>
603
604<dl class="method">
605<dt id="CI_Cache::increment">
606<code class="descname">increment</code><span class="sig-paren">(</span><em>$id</em><span class="optional">[</span>, <em>$offset = 1</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::increment" title="Permalink to this definition"></a></dt>
607<dd><table class="docutils field-list" frame="void" rules="none">
608<col class="field-name" />
609<col class="field-body" />
610<tbody valign="top">
611<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
612<li><strong>$id</strong> (<em>string</em>) – Cache ID</li>
613<li><strong>$offset</strong> (<em>int</em>) – Step/value to add</li>
614</ul>
615</td>
616</tr>
617<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">New value on success, FALSE on failure</p>
618</td>
619</tr>
620<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
621</td>
622</tr>
623</tbody>
624</table>
625<p>Performs atomic incrementation of a raw stored value.</p>
626<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// &#39;iterator&#39; has a value of 2</span>
627
628<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">increment</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 3</span>
629
630<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">increment</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">,</span> <span class="mi">3</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 6</span>
631</pre></div>
632</div>
633</dd></dl>
634
635<dl class="method">
636<dt id="CI_Cache::decrement">
637<code class="descname">decrement</code><span class="sig-paren">(</span><em>$id</em><span class="optional">[</span>, <em>$offset = 1</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::decrement" title="Permalink to this definition"></a></dt>
638<dd><table class="docutils field-list" frame="void" rules="none">
639<col class="field-name" />
640<col class="field-body" />
641<tbody valign="top">
642<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
643<li><strong>$id</strong> (<em>string</em>) – Cache ID</li>
644<li><strong>$offset</strong> (<em>int</em>) – Step/value to reduce by</li>
645</ul>
646</td>
647</tr>
648<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">New value on success, FALSE on failure</p>
649</td>
650</tr>
651<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
652</td>
653</tr>
654</tbody>
655</table>
656<p>Performs atomic decrementation of a raw stored value.</p>
657<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// &#39;iterator&#39; has a value of 6</span>
658
659<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">decrement</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 5</span>
660
661<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">decrement</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 3</span>
662</pre></div>
663</div>
664</dd></dl>
665
666<dl class="method">
667<dt id="CI_Cache::clean">
668<code class="descname">clean</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::clean" title="Permalink to this definition"></a></dt>
669<dd><table class="docutils field-list" frame="void" rules="none">
670<col class="field-name" />
671<col class="field-body" />
672<tbody valign="top">
673<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
674</tr>
675<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
676</tr>
677</tbody>
678</table>
679<p>This method will ‘clean’ the entire cache. If the deletion of the
680cache files fails, the method will return FALSE.</p>
681<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">clean</span><span class="p">();</span>
682</pre></div>
683</div>
684</dd></dl>
685
686<dl class="method">
687<dt id="CI_Cache::cache_info">
688<code class="descname">cache_info</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::cache_info" title="Permalink to this definition"></a></dt>
689<dd><table class="docutils field-list" frame="void" rules="none">
690<col class="field-name" />
691<col class="field-body" />
692<tbody valign="top">
693<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Information on the entire cache database</td>
694</tr>
695<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">mixed</td>
696</tr>
697</tbody>
698</table>
699<p>This method will return information on the entire cache.</p>
700<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">var_dump</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">cache_info</span><span class="p">());</span>
701</pre></div>
702</div>
703<div class="admonition note">
704<p class="first admonition-title">Note</p>
705<p class="last">The information returned and the structure of the data is dependent
706on which adapter is being used.</p>
707</div>
708</dd></dl>
709
710<dl class="method">
711<dt id="CI_Cache::get_metadata">
712<code class="descname">get_metadata</code><span class="sig-paren">(</span><em>$id</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::get_metadata" title="Permalink to this definition"></a></dt>
713<dd><table class="docutils field-list" frame="void" rules="none">
714<col class="field-name" />
715<col class="field-body" />
716<tbody valign="top">
717<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
718<li><strong>$id</strong> (<em>string</em>) – Cache item name</li>
719</ul>
720</td>
721</tr>
722<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Metadata for the cached item</p>
723</td>
724</tr>
725<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
726</td>
727</tr>
728</tbody>
729</table>
730<p>This method will return detailed information on a specific item in the
731cache.</p>
732<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">var_dump</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get_metadata</span><span class="p">(</span><span class="s1">&#39;my_cached_item&#39;</span><span class="p">));</span>
733</pre></div>
734</div>
735<div class="admonition note">
736<p class="first admonition-title">Note</p>
737<p class="last">The information returned and the structure of the data is dependent
738on which adapter is being used.</p>
739</div>
740</dd></dl>
741
742</dd></dl>
743
744</div>
745<div class="section" id="drivers">
746<h2><a class="toc-backref" href="#id3">Drivers</a><a class="headerlink" href="#drivers" title="Permalink to this headline"></a></h2>
747<div class="section" id="alternative-php-cache-apc-caching">
748<h3><a class="toc-backref" href="#id4">Alternative PHP Cache (APC) Caching</a><a class="headerlink" href="#alternative-php-cache-apc-caching" title="Permalink to this headline"></a></h3>
749<p>All of the methods listed above can be accessed without passing a
750specific adapter to the driver loader as follows:</p>
751<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
752<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">apc</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
753</pre></div>
754</div>
755<p>For more information on APC, please see
756<a class="reference external" href="http://php.net/apc">http://php.net/apc</a>.</p>
757</div>
758<div class="section" id="file-based-caching">
759<h3><a class="toc-backref" href="#id5">File-based Caching</a><a class="headerlink" href="#file-based-caching" title="Permalink to this headline"></a></h3>
760<p>Unlike caching from the Output Class, the driver file-based caching
761allows for pieces of view files to be cached. Use this with care, and
762make sure to benchmark your application, as a point can come where disk
763I/O will negate positive gains by caching.</p>
764<p>All of the methods listed above can be accessed without passing a
765specific adapter to the driver loader as follows:</p>
766<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
767<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">file</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
768</pre></div>
769</div>
770</div>
771<div class="section" id="memcached-caching">
772<h3><a class="toc-backref" href="#id6">Memcached Caching</a><a class="headerlink" href="#memcached-caching" title="Permalink to this headline"></a></h3>
773<p>Multiple Memcached servers can be specified in the memcached.php
774configuration file, located in the _application/config/* directory.</p>
775<p>All of the methods listed above can be accessed without passing a
776specific adapter to the driver loader as follows:</p>
777<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
778<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">memcached</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
779</pre></div>
780</div>
781<p>For more information on Memcached, please see
782<a class="reference external" href="http://php.net/memcached">http://php.net/memcached</a>.</p>
783</div>
784<div class="section" id="wincache-caching">
785<h3><a class="toc-backref" href="#id7">WinCache Caching</a><a class="headerlink" href="#wincache-caching" title="Permalink to this headline"></a></h3>
786<p>Under Windows, you can also utilize the WinCache driver.</p>
787<p>All of the methods listed above can be accessed without passing a
788specific adapter to the driver loader as follows:</p>
789<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
790<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">wincache</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
791</pre></div>
792</div>
793<p>For more information on WinCache, please see
794<a class="reference external" href="http://php.net/wincache">http://php.net/wincache</a>.</p>
795</div>
796<div class="section" id="redis-caching">
797<h3><a class="toc-backref" href="#id8">Redis Caching</a><a class="headerlink" href="#redis-caching" title="Permalink to this headline"></a></h3>
798<p>Redis is an in-memory key-value store which can operate in LRU cache mode.
799To use it, you need <a class="reference external" href="https://github.com/phpredis/phpredis">Redis server and phpredis PHP extension</a>.</p>
800<p>Config options to connect to redis server must be stored in the application/config/redis.php file.
801Available options are:</p>
802<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;socket_type&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;tcp&#39;</span><span class="p">;</span> <span class="c1">//`tcp` or `unix`</span>
803<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;socket&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/var/run/redis.sock&#39;</span><span class="p">;</span> <span class="c1">// in case of `unix` socket type</span>
804<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;host&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;127.0.0.1&#39;</span><span class="p">;</span>
805<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;password&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">NULL</span><span class="p">;</span>
806<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;port&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">6379</span><span class="p">;</span>
807<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;timeout&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
808</pre></div>
809</div>
810<p>All of the methods listed above can be accessed without passing a
811specific adapter to the driver loader as follows:</p>
812<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
813<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">redis</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
814</pre></div>
815</div>
816<p>For more information on Redis, please see
817<a class="reference external" href="http://redis.io">http://redis.io</a>.</p>
818</div>
819<div class="section" id="dummy-cache">
820<h3><a class="toc-backref" href="#id9">Dummy Cache</a><a class="headerlink" href="#dummy-cache" title="Permalink to this headline"></a></h3>
821<p>This is a caching backend that will always ‘miss.’ It stores no data,
822but lets you keep your caching code in place in environments that don’t
823support your chosen cache.</p>
824</div>
825</div>
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