title: Search for a string in HTML source rendered page with PHP
body: <p>I have a rendered page written in PHP that output this code:</p>
  
  <pre><code>    &lt;html&gt;
      &lt;body&gt;
     random code 
  
      &lt;u&gt;Hello everyone&lt;/u&gt;
  
     random code    
      &lt;/body&gt;
      &lt;/html&gt;
  </code></pre>
  
  <p>Now I need to check if the page contains the string 'Hello everyone' and to something when found, or do nothing when not found. The page rendered is located in the same server.
  Thanks.</p>