<?php  
 function check($user_id, $topic_id){

        $query = mysql_query("SELECT user_id, topic_id FROM sa where topic_id='$topic_id' and user_id='$user_id'");
        if (mysql_num_rows($query)==1){



           return 'you have already voted';
        }
        else {

            $against = ' <li>
    <button type="submit" value="Actions" class="against" title="against">
      <i></i><span>Against</span></button>
          </li>';

            $support ='<li>
            <button type="submit" value="Actions" class="support" title="support">
                <i></i>
                <span>Support</span>
            </button>
        </li>';
            return compact('support', 'against');
        }

extract(check($_SESSION['user_id'], $topicId));

  echo $against;
  echo $support;
?>

ben bu hatayı almaya devam:

Warning: extract() [function.extract]: First argument should be an array