title: php array_iunique case insensitive no latin values
body: <p>Hello I have string that might include duplicate strings-words for example "Το το" So far what I have is this:</p>
  
  <pre><code>function array_iunique($array) {
      return array_intersect_key($array,array_unique(array_map('mb_strtolower',$array)));
  }
  </code></pre>
  
  <p><a href="http://www.php.net/manual/de/function.array-unique.php#78801" rel="nofollow">array_iunique</a></p>
  
  <p>When i test with a string in English like "To to" it works great and outputs an array with 1 value, but when I try it with the Greek string mentioned above it doesn't. What am I missing here ?</p>
  
  <p>Expected result would be to return only 1 word and I'm interested in Greek only.</p>