title: How to convert ASCII characters in a string in to normal characters?
body: <p>How to change all ASCII character-set in a string to normal form with a single function?
  for example:
  for string "Hello Günter" when change into ASCII character-set is "text=Hello+G%C3%BCnter". I want reverse of this. I have string like "text=Hello+G%C3%BCnter" need to obtain "Hello Günter".
  is there build in function in PHP? </p>