How to add like on instagram media using php

Question

i'm building a small App for instagram and i need to post a like on any media

$uurl='https://api.instagram.com/v1/media/'.$media_id.'/likes';
            $inst_stream2 = callInstagram($uurl);
            $results2 = json_decode($inst_stream2, true);

    function callInstagram($url)
       {
    $ch = curl_init();
   curl_setopt_array($ch, array(
      CURLOPT_URL => $url,
      CURLOPT_RETURNTRANSFER => true,
      CURLOPT_SSL_VERIFYPEER => false,
      CURLOPT_SSL_VERIFYHOST => 2
      ));

     $result = curl_exec($ch);
      curl_close($ch);
     return $result;
    }

but it doesn't post any like !!