$postID = $_REQUEST['pIdPost'];
    $result = mysqli_query($con,
    "SELECT

comments.IdPost, comments.IdUser,
comments.Comment AS Comment , users.UserImage ,
users.Username ,  DATE_FORMAT(comments.CommentDate, '%d/%m/%Y %H:%i:%s') AS cDate

    FROM comments, users

    WHERE

    comments.IdPost = '$postID'

    AND

    users.IdUser = comments.IdUser ")or die('Errant Query:');

    while($row = mysqli_fetch_assoc($result))
        {
            $output[]=$row;
        }

    header('content-type: application/json; charset=utf-8');

    print(json_encode($output, JSON_UNESCAPED_UNICODE));
    //print(json_encode($output));
    mysqli_close($con);

[{"IdPost":"2",
"IdUser":"5",
"Comment":"Me 3",
"UserImage":"images/defaultUser.png",
"Username":"Mia",
"CommentDate":"16/11/2014 00:01:05"}]