php中static和self的区别

在阅读一些框架的源码时发现了new static()，和new self()，甚是不解，后来查阅资料，才知道static采用了延迟绑定，能准确知道是父类还是子类的调用。这就是说static是个聪明的小孩，家里的亲戚的辈分他都能准确的叫出；而不是像他的兄弟self，只知道自己的亲爹妈。

例子如下：

<?php

class Father{

    protected  static $name = "father";

    public static function whoami_self(){

        echo self::$name."\n";

    }

    public static function whoami_static(){

        echo static::$name."\n";

    }

    public static function getInstance_self(){

        return new self();

    }

    public static function getInstance_static(){

        return new static();

    }

}

class FatherBrother extends Father{

    protected  static $name = "uncle";

}

FatherBrother::whoami_self(); //father

FatherBrother::whoami_static(); //uncle

var_dump(FatherBrother::getInstance_self()); //father

var_dump(var_dump(FatherBrother::getInstance_static())); //uncle

巴特西

php中static和self的区别

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