Koenig, Мини ошибка, " - забыл.
$valid_url = mysql_result(mysql_query("select count(*) from `favorites` where `user_id` = '$user_id' and `url` = '$url'"), 0); Koenig, Мини ошибка, " - забыл.
$valid_url = mysql_result(mysql_query("select count(*) from `favorites` where `user_id` = '$user_id' and `url` = '$url'"), 0);