Php code highlight in Jekyll kramdown don't work

I'm using Jekyll with kramdown and pygments, it work fine for javascript or python code but When I create php like:

{% highlight php %}header('Content-Type: application/json');echo json_encode(array('jsonrpc' => "2.0",'result' => $result,'id' => $request->id,'error' => null));{% endhighlight %}

Each line is one span with x class:

<code class="language-php" data-lang="php"><span class="x">header('Content-Type: application/json');</span><span class="x">echo json_encode(array(</span><span class="x">    'jsonrpc' =&gt; "2.0",</span><span class="x">    'result' =&gt; $result,</span><span class="x">    'id' =&gt; $request-&gt;id,</span><span class="x">    'error' =&gt; null</span><span class="x">));</span></code>

Why I don't have tokens with different classes for php code?