PHP没有响应数据

Question

           if($_POST['uniq']){

            $st = $conn->prepare("SELECT * FROM user_friends WHERE (send_to=:uniq OR send_from=:Uniq) AND (send_to=:Uniq OR send_from=:uniq) AND clearence='1'");
            $st->bindParam("Uniq", $friend);
            $st->bindParam("uniq" , $uniq);
            $st->execute();

            if($st->rowCount() > 0)
            {
                echo 'friend';
            }

            $st1 = $conn->prepare("SELECT * FROM user_friends WHERE send_to=:uniq AND send_from=:Uniq AND clearence='0'");
            $st1->bindParam("Uniq", $friend);
            $st1->bindParam("uniq" , $uniq);
            $st1->execute();

            if($st1->rowCount() > 0)
            {
                echo 'uncleared';
            }
 }else{
echo 'Something Went Wrong!';
}

没有响应数据返回但是ajax请求成功发送的参数。