Группировать и сортировать личные сообщения

$qMess = mysqli_query($connect,"SELECT * FROM `messages` WHERE (m_to='".$user["id"]."') OR (m_from='".$user["id"]."') GROUP BY m_to ORDER BY `mess_id` DESC");

$qMess = mysqli_query($connect,"SELECT * FROM `messages` WHERE (m_to='".$user["id"]."') OR (m_from='".$user["id"]."') ORDER BY `m_to` ASC, `mess_id` DESC");

$qMess = mysqli_query($connect,"SELECT * FROM `messages` WHERE (m_to='".$user["id"]."') OR (m_from='".$user["id"]."') ORDER BY 
if(`m_from`='".$user["id"]."',1,0) DESC, `mess_id` DESC");

$qMess = mysqli_query($connect,"SELECT * FROM `messages` WHERE (m_to='".$user["id"]."') OR (m_from='".$user["id"]."') ORDER BY 
if(`m_to`='".$user["id"]."',1,0) DESC, `mess_id` DESC");

$qMess = mysqli_query($connect,"SELECT * FROM `messages` WHERE (m_to='".$user["id"]."') OR (m_from='".$user["id"]."') ORDER BY `mess_id` DESC");

$dialog = array();
$orderdialog = array();
while ($row=mysql_fetch_assoc($qMess)) {
$users = ($user['id']==$row['m_to'])?($row['m_to'].$row['m_from']):($row['m_from'].$row['m_to']);
if (!isset($dialog[$users])) { $dialog[$users] = array(); $orderdialog[] = $users; }
$dialog[$users][] = $row;
}

foreach ($orderdialog as $users) {
$cd = $dialog[$users];
var_dump($cd); 
}

while ($row = $qMess->fetch_assoc())