Register Form. Why the function mysql_query($query); retuns FALSE?

PHP
2

The problem has solved. I added:

require 'connect.inc.php';

register.php


<?php
require 'connect.inc.php';
....
?>

connect.inc.php


<?php
$mysql_host = 'localhost';
$mysql_user = 'root';
$mysql_pass = '';

$mysql_db = 'a_database';

if (!@mysql_connect($mysql_host, $mysql_user, $mysql_pass) || !@mysql_select_db($mysql_db)) {
    die(mysql_error());
}
?>

P.S. It’s from the video tutorial: http://thenewboston.org/watch.php?cat=11&number=146