[PHP知识库]php 单例模式，又在脑海中重温了一次

温故而知新。下面的代码能否进一步升级的更完善？欢迎思考留言。

<?php

class Database
{
    // 保存实例化对象
    private static $instance;

    //保存数据库句柄
    private $db;

    private function __construct(array $options)
    {
        // $this->db = mysqli_connect($options['dh_host'], $options['db_user'], $options['db_password'],
        //     $options['db_database']);
    }

    public static function getInstance(array $options): self
    {
        if (static::$instance === null) {
            static::$instance = new static($options);
        }
        return static::$instance;
    }

    public function getDb()
    {
        return $this->db;
    }

    private function __clone()
    {
        // echo 'Clone' . PHP_EOL;
    }

    public function __wakeup()
    {
        // echo 'wakeup';
    }
}

$database = Database::getInstance([]);
// $databaseNew = clone $database;
// $database = serialize($database);
// $database = unserialize($database);