PHP 7.2 abstract function override 的使用
abstract class KeyManagerAbstract { /** * 类似于 * * return [ * self::UCC_USER_DETAIL => ["ucc:user:h:%d", 10], * ]; * * @return array */ abstract protected static function hashMap(); public static function getHashKey(string $format, int $id) { } } class KeyManager extends KeyManagerAbstract { prote