public function init()
    {
        $host =getenv('PDO_HOST');
        if($host) {
            $this->setHost(trim($host));
        }

        $database = getenv('PDO_DATABASE');
        if($database) {
            $this->setDatabase(trim($database));
        }
        $user = getenv('PDO_USER');
        if($user) {
            $this->setUser($user);
        }

        $password = getenv('PDO_PASSWORD');
        if($password) {
            $this->setPassword($password);
        }
    }