<?php declare(strict_types=1); namespace mystic\forum\utils; use mystic\forum\Database; use mystic\forum\orm\User; final class ValidationUtils { use StaticClass; public static function isUsernameValid(string $name): bool { return !!preg_match('/^[a-z0-9]([._](?![._])|[a-z0-9]){2,30}[a-z0-9]$/', $name); } public static function isUsernameAvailable(Database &$db, string $name): bool { $user = new User(); $user->name = $name; return !$db->fetchWhere($user, "name"); } }