title: Search Text In Files Using PHP
body: <p>How to search text in some files like PDF, doc, docs or txt using PHP?
  I want to do similar function as Full Text Search in MySQL,
  but this time, I'm directly search through files, not database.</p>
  
  <p>The search will do searching in many files that located in a folder.
  Any suggestion, tips or solutions for this problem?</p>
  
  <p>I also noticed that, google also do searching through the files.</p>