title: php replace %20
body: <p>i curently try to make a search for my system using $_GET
  so when user copy the address link of results <a href="http://localhost/search?q=iphone%204" rel="nofollow">http://localhost/search?q=iphone%204</a></p>
  
  <p>how to replce %20 to use + and for same time,when query the sql,it will search for 'iphone 4' not 'iphone+4' .</p>
  
  <p>any idea?</p>
  
  <p>thanks</p>