Multi user mysql for VBB forum

$dbusers = array(
array('user' => 'mysql_username_1', 'password' => 'mysql_password_1') // First MySQL user/password combination
, array('user' => 'mysql_username_2', 'password' => 'mysql_password_2') // Second MySQL user/password combination
, array('user' => 'mysql_username_3', 'password' => 'mysql_password_3') // Third MySQL user/password combination
);
$mysql_user = $dbusers[rand(0, count($dbusers) - 1)];
$config['MasterServer']['username'] = $mysql_user['user'];
$config['MasterServer']['password'] = $mysql_user['password'];