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
转载至:https://www.cnblogs.com/xdao/p/static_self_in_php.html