title: DOMPDF echo() not outputting text
body: <p>I just upgraded to dompdf 6.1 and now when I do something like </p>
  
  <pre><code>&lt;?php echo 'hello'; ?&gt; 
  </code></pre>
  
  <p>inside my document, the 'hello' does not show up on the pdf. According to the documentation I should be allowed to use</p>
  
  <pre><code>&lt;?php ?&gt; 
  </code></pre>
  
  <p>in my html to render text... here is my html, when I render it all that shows is "Test" on the pdf document</p>
  
  <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
  &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;
  &lt;head&gt;
  &lt;meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /&gt;
  &lt;title&gt;Untitled Document&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
  Test &lt;?php echo 'Hello'; ?&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Any ideas? I am not sure what I am doing wrong.</p>
  
  <p>Thank you</p>
  
  <p>EDIT: For people googling for this...</p>
  
  <p>I now use the method of capturing the output buffer. I should have updated this question long ago. Now, instead of using file_get_contents("myFile.php") I do this:</p>
  
  <pre><code>ob_start();
  require_once("myFile.php");
  $dompdf = new DOMPDF();
  $myHtmlInput = ob_get_clean();
  $dompdf-&gt;load_html($myHtmlInput);
  </code></pre>
  
  <p>Using this method will resolve any issues I outline above, though I think after 4 years, most people will have figured this out already.</p>