title: Get HTML source code of page with PHP
body: <p>If I have the html file:</p>
  
  <pre><code>&lt;!doctype html&gt;
   &lt;html&gt;
    &lt;head&gt;&lt;/head&gt;
     &lt;body&gt;
      &lt;!-- Begin --&gt;
      Important Information
      &lt;!-- End --&gt;
     &lt;/body&gt;
    &lt;/head&gt;
   &lt;/html&gt;
  </code></pre>
  
  <p>How can I use PHP to get the string "Important Information" from the file?</p>