etozhemaks 
App Store 
$ggmsg = DB::Query("SELECT * FROM `gchat` where `id_user` = '".$user['id']."' ORDER BY `id` DESC LIMIT 1");
$mmmm = DB::Query("SELECT * FROM `gchat` ORDER BY `id` DESC LIMIT 1");
while($gmsg = DB::Assoc($ggmsg)){
if($mmmm['id'] == $gmsg['id'])
$err = 'Test';
}
Пупся 
Jack Sparrow
$mmmm = DB::Query("SELECT * FROM `gchat` ORDER BY `id` DESC LIMIT 1")->fetch();
if($user['id'] == $mmmm['id_user']) {
$err = 'Test';
}