$user_chat = mysql_query("SELECT `postchat` FROM `chat_users` WHERE `id_u` = '" . $user . "' LIMIT 1");
echo $user_chat['postchat'];$user - идентефикатор пользователя. $user_chat = mysql_query("SELECT `postchat` FROM `chat_users` WHERE `id_u` = '" . $user . "' LIMIT 1");
echo $user_chat['postchat'];$user - идентефикатор пользователя.