title: Json_encode Charset problem
body: <p>When I use json_encode to encode my multi lingual strings , It also changes special characters.What should I do to keep them same .</p>
  
  <p>For example </p>
  
  <pre><code>&lt;?
  echo json_encode(array('şüğçö'));
  </code></pre>
  
  <p>It returns something like ["\u015f\u00fc\u011f\u00e7\u00f6"]</p>
  
  <p>But I want ["şüğçö"]</p>