title: find a specific word in external page
body: <p>How to find a specific word in a external page using php ?
  (dom or pregmatch, or what else ?)</p>
  
  <p>example in foo.com source code with :</p>
  
  <blockquote>
    <p>span name="abcd"</p>
  </blockquote>
  
  <p>I want to check if the word abcd is in foo.com in php</p>