Авторизация Логин/Email как реализовать?

if ($config['auth_metod']) {

$config['auth_metod'] = (preg_match('/.+@.+\..+/i',$_POST['login_name'])===1);

$_POST['login_name'] = $db->safesql($_POST['login_name']);

$where = filter_var($_POST['login_name'], FILTER_VALIDATE_EMAIL) ? "email" : "name";
$where.= "='{$_POST['login_name']}'";

$method = $db->super_query( "SELECT method FROM " . USERPREFIX . "_users WHERE {$where}" );

if( $method['method'] ) {
	if( preg_match( "/[\||\'|\<|\>|\"|\!|\?|\$|\/|\\\|\&\~\*\+]/", $_POST['login_name']) ) $allow_user = false;
	$where_name = "email='{$_POST['login_name']}'";
} else {
	if( preg_match( "/[\||\'|\<|\>|\"|\!|\?|\$|\@|\/|\\\|\&\~\*\+]/", $_POST['login_name']) ) $allow_user = false;
	$where_name = "name='{$_POST['login_name']}'";
}