title: Slug Url turkish character
body: <p>I have one question. I am using slug url function for my SEO friendly url but my function not posted turkish character.</p>
  
  <pre><code>function url_slug($str)
  {   
      $str = mb_strtolower( trim( $str ), 'UTF-8' );
      $str = preg_replace('/[^a-zA-Z0-9]/i',' ', $str);
      $str = trim($str);
      $str = preg_replace('/\s+/', '-', $str);
      return $str;
  }
  </code></pre>
  
  <p>for example when i post this title: <code>şekerli bir öğütücü çok ışıklı bir bahçe</code></p>
  
  <p>Url shows me : <code>ekerli-bir-t-c-ok-kl-bir-bah-e</code></p>
  
  <p>What can i do here? Anyone can help me here ?</p>