Yac::get (PECL yac >= 1.0.0)Yac::get — Retrieve values from cache 说明 public Yac::get(string|array $key, int &$cas = null): mixed Retrieve values from cache 参数 key string keys, or array of multiple keys. cas if not null, it will be set to the retrieved item's cas. 返回值 mixed on success, false on failure