建设网站定位分析/推广代理

额，只是复习到这里，做点笔记吧。

单例模式。何谓也？我想就是唯一吧。唯一的意思大概希特勒已经说的很清楚了。就是我也说不明白……把代码贴上来了事。

<?php
// Single instance mode(Pardon me for my Chinglish...if there is someone look this...)
class Single {
    // the private construct method for not to be extends or get instance
    private function __construct()
    {
        // in this moment just do nothing
    }

    private static $instance = null; // for store the single instance

    // private function __clone(){} # Is it necessary?
    
    public static function getObj()
    {
        if ( ! isset(self::$instance) )
        {
            $obj = new self();
            
            return self::$instance = $obj;
        }
        else
            return self::$instance;
    }
}

// $single = new Single(); 

$single = Single::getObj();
$singl1 = Single::getObj();
$singl2 = Single::getObj();

var_dump($single, $singl1, $singl2);

if ($single === $singl1)
    echo '<pre>So...Like this, is it right? ';

以前听培训老师讲的是“三私一公”，可这个三思，我也忘了，不记得写__clone了。也茫然到底写还是不写。为此我搜了两条记录。只是看看……

http://blog.csdn.net/shenpengchao/article/details/51865083

http://www.jb51.net/article/68752.htm

End of jottings.