title: PHP Multiple Occurences Of Words Within A String
body: <p>I need to check a string to see if any word in it has multiple occurences. So basically I will accept:</p>
  
  <p>"google makes love"</p>
  
  <p>but I don't accept:</p>
  
  <p>"google makes google love" or "google makes love love google" etc.</p>
  
  <p>Any ideas? Really don't know any way to approach this, any help would be greatly appreciated.</p>