mrkad
/
php-phantomjs
zrcadlo https://github.com/jonnnnyw/php-phantomjs.git


			
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  <h1>Debugging </h1>
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<article>
    
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	  <ul>
  <li><a href="#phantomjs-log">PhantomJS log</a></li>
  <li><a href="#javascript-console-log">Javascript console log</a></li>
  <li><a href="#validation-errors">Validation errors</a></li>
</ul>

<hr />

<h2 id="phantomjs-log">PhantomJS log</h2>

<p>Verbose logging can be enabled for PhantomJS by setting the debug flag on the client. This is the same as setting the PhantomJS <code>--debug=true</code> command line option.</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">getEngine</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">debug</span><span class="p">(</span><span class="k">true</span><span class="p">);</span></code></pre></figure>

<p>The client log can be inspected after making a 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="o">...</span>
    
    <span class="nv">$client</span><span class="o">-&gt;</span><span class="na">getLog</span><span class="p">();</span> <span class="c1">// String</span>
    
    <span class="o">...</span></code></pre></figure>

<blockquote>
  <h4 id="note">Note</h4>
  <p>The client log contains some helpful information specific to the PhantomJS library. In some cases these are present in the log even if debugging is disabled.</p>
</blockquote>

<h2 id="javascript-console-log">Javascript console log</h2>

<p>The response object also provides access to a console log. Any javascript errors raised on the requested page will be present in the response console log.</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="o">...</span>
    
    <span class="nv">$response</span><span class="o">-&gt;</span><span class="na">getConsole</span><span class="p">();</span> <span class="c1">// Array</span>
    
    <span class="o">...</span></code></pre></figure>

<h2 id="validation-errors">Validation errors</h2>

<p>Before a script template is compiled and cached it is validated using the <a href="http://">Esprima</a> javascript validation engine. If the script fails to validate then a <code>JonnyW\PhantomJs\Exception\SyntaxException</code> will be raised. Debug information about any validation errors can be found by calling a <code>getErrors()</code> helper method on the exception instance. This will return an array of error information. </p>

<figure class="highlight"><pre><code class="language-php" data-lang="php"><span class="x">    </span><span class="cp">&lt;?php</span> 
    
    <span class="c1">// $exception-&gt;getErrors();    </span>
    <span class="k">array</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
      <span class="k">array</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span> <span class="p">{</span>
        <span class="s1">&#39;lineNumber&#39;</span>  <span class="o">=&gt;</span> <span class="mi">1</span><span class="p">,</span>
        <span class="s1">&#39;column&#39;</span>      <span class="o">=&gt;</span> <span class="mi">17</span><span class="p">,</span>
        <span class="s1">&#39;index&#39;</span>       <span class="o">=&gt;</span> <span class="mi">16</span><span class="p">,</span>
        <span class="s1">&#39;description&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;Unexpected token ;&#39;</span><span class="p">,</span>
        <span class="s1">&#39;message&#39;</span>     <span class="o">=&gt;</span> <span class="s1">&#39;Line 1: Unexpected token ;&#39;</span>
      <span class="p">}</span>
    <span class="p">}</span></code></pre></figure>

<blockquote>
  <h4 id="important">Important</h4>
  <p>Due to a limitation in the validation logic, scripts are currently minified to a single line before validating. This makes the <code>lineNumber</code> value contained in the error output redundant. This is due to be fixed in a future release.</p>
</blockquote>

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