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  <h1>Caching </h1>
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<article>
    
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	  <ul>
  <li><a href="#script-caching">Script caching</a></li>
  <li><a href="#clearing-the-cache">Clearing the cache</a></li>
  <li><a href="#disabling-the-cache">Disabling the cache</a></li>
</ul>

<hr />

<h2 id="script-caching">Script caching</h2>

<p>By default the PHP PhantomJs library compiles and aggressively caches script templates the first time that they are run. This means that if you override any <a href="http://jonnnnyw.github.io/php-phantomjs/4.0/custom-scripts/">partial scripts</a> after the script template has been cached by the library then the changes will not take affect until you <a href="#clearing-the-cache">clear the compiled cache</a>.</p>

<p>It is recommended that you <a href="#disabling-the-cache">disable the compiler cache</a> while developing your own custom scripts.</p>

<blockquote>
  <h4 id="note">Note</h4>
  <p>The default cache location is the system tmp directory. The location of this directory can be found through the <code>sys_get_temp_dir()</code> PHP directive.</p>
</blockquote>

<h2 id="disabling-the-cache">Disabling the cache</h2>

<p>The compiler cache can be easily disabled. When disabled script templates will be compiled for each request and no caching will take place.</p>

<figure class="highlight"><pre><code class="language-php" data-lang="php"><span class="x">    </span>
<span class="x">    </span><span class="cp">&lt;?php</span>
    
    <span class="k">use</span> <span class="nx">JonnyW\PhantomJs\Client</span><span class="p">;</span>
    
    <span class="nv">$client</span> <span class="o">=</span> <span class="nx">Client</span><span class="o">::</span><span class="na">getInstance</span><span class="p">();</span>
    <span class="nv">$client</span><span class="o">-&gt;</span><span class="na">getProcedureCompiler</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">disableCache</span><span class="p">();</span></code></pre></figure>

<p>The compiler cache is enabled by default however you can enable it manually if the situation arises.</p>

<figure class="highlight"><pre><code class="language-php" data-lang="php"><span class="x">    </span>
<span class="x">    </span><span class="cp">&lt;?php</span>
    
    <span class="k">use</span> <span class="nx">JonnyW\PhantomJs\Client</span><span class="p">;</span>
    
    <span class="nv">$client</span> <span class="o">=</span> <span class="nx">Client</span><span class="o">::</span><span class="na">getInstance</span><span class="p">();</span>
    <span class="nv">$client</span><span class="o">-&gt;</span><span class="na">getProcedureCompiler</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">enableCache</span><span class="p">();</span></code></pre></figure>

<blockquote>
  <h4 id="important">Important</h4>
  <p>Script caching greatly improves performance therefore you should ensure that the cache is enabled in any production environment or in situtations where performance is important.</p>
</blockquote>

<h2 id="clearing-the-cache">Clearing the cache</h2>

<p>The compiler cache can be easily cleared. This will force script templates to be recompiled and cached on the next request.</p>

<figure class="highlight"><pre><code class="language-php" data-lang="php"><span class="x">    </span>
<span class="x">    </span><span class="cp">&lt;?php</span>
    
    <span class="k">use</span> <span class="nx">JonnyW\PhantomJs\Client</span><span class="p">;</span>
    
    <span class="nv">$client</span> <span class="o">=</span> <span class="nx">Client</span><span class="o">::</span><span class="na">getInstance</span><span class="p">();</span>
    <span class="nv">$client</span><span class="o">-&gt;</span><span class="na">getProcedureCompiler</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">clearCache</span><span class="p">();</span></code></pre></figure>

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