* 13 * * * /usr/bin/php /var/www/path/to/file/database-bkup-test.php &>/tmp/mycroncommand.log

$today = date('Y-m-d');
$user = 'db_user';
$password = 'db_password';
$host = '127.0.0.1'; //this is actually replaced with an address to another remote server
$port='3306';
$database='database_name';

exec('mysqldump --user='.$user.' --password='.$password.' --host='.$host.' --port='.$port.' '.$database.' > /db-bkup/db-'.$today.'.sql');