src/Storage/Bloc.php
public function has($uid) {
        if (null === $this->memory) {
            return false;
        }
        return shm_has_var($this->memory, $uid);
    }
public function has($uid) {
        if (null === $this->memory) {
            return false;
        }
        return shm_has_var($this->memory, $uid);
    }
Test if has datas with $uid key
@param mixed $uid
@return boolean