这段 php 代码中的一个静态方法的问题

[jacob]

Singleton::getInstance 既没被继承，也没被调用，那么cache是如何得到 它的实例的呢？$this->_handle = new StdClass(); 按我理解就是创建了一个空的对象，具体实现也无法明白

<?php
class Singleton
{
    private static $_instances = array();

    protected function __construct()
    {
    }

    final public function __clone()
    {
        trigger_error("clone method is not allowed.", E_USER_ERROR);
    }

    final public static function getInstance()
    {
        $c = get_called_class();

        if(!isset(self::$_instances[$c])) {
            self::$_instances[$c] = new $c;
        }

        return self::$_instances[$c];
    }
}

class Cache Extends Singleton
{
    private $_handle = null;

    protected function __construct()
    {
        $this->_connect();
    }

    private function _connect()
    {
        $this->_handle = new StdClass();
    }

    public function getHandle()
    {
        return $this->_handle;
    }
}

[hahasong]

Cache::getInstance()会把$_handle赋值给$_instances['Cache']
都singleton了还继承干什么，写的shenmagui

[jacob]

@hahasong getInstance 是final的，怎么会继承呢，

[hahasong]

@jacob final只是不能覆盖，怎么不能继承

[jacob]

@hahasong 那是我理解错误。sorry

[laoyuan]

@jacob LZ，请问怎么在V2发代码啊？我只会用gist。。