php单例模式

最新推荐文章于 2024-10-14 13:22:54 发布

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最新推荐文章于 2024-10-14 13:22:54 发布

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class Singleton
{
    /**
     * @var array
     */
    private static $instances = [];

    /**
     * Prevent direct instantiation.
     */
    private function __construct()
    {
    }

    /**
     * Get the instance of this class.
     *//self 当前函数所在类 static 当前调用的类名

* @return mixed */ final public static function getInstance() { $classname = get_called_class(); if (! isset(self::$instances[$classname])) { self::$instances[$classname] = new static(); } return self::$instances[$classname]; } /** * Prevent cloning. * * @throws \RuntimeException */ final public function __clone() { throw new \RuntimeException('Clone is not allowed for ' . get_class($this)); } /** * Prevent unserialization. * * @throws \RuntimeException */ final public function __wakeup() { throw new \RuntimeException('Unserialization is not allowed for ' . get_class($this)); }}