Šak to tam máš napsané v čem je chyba.
A když si vyjedeš mysql_connect na php:
http://php.net/manual/en/function.mysql-connect.php
tak tam máš:
"Warning
This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used."
Tomu taky nerozumíš?