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php面向对象编程self和static的区别,面向对象编程self
Jun 13, 2016 am 08:41 AM
php
self
static
php面向对象编程self和static的区别,面向对象编程self
在php的面向对象编程中,总会遇到
class test{ public static function test(){ self::func(); static::func(); } public static function func(){} }
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可你知道self和static的区别么?
其实区别很简单,只需要写几个demo就能懂:
Demo for self:
class Car { public static function model(){ self::getModel(); } protected static function getModel(){ echo "This is a car model"; } }
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Car::model();
Class Taxi extends Car { protected static function getModel(){ echo "This is a Taxi model"; } }
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Taxi::model();
得到输出
This is a car model This is a car model
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可以发现,self在子类中还是会调用父类的方法
Demo for static
class Car { public static function model(){ static::getModel(); } protected static function getModel(){ echo "This is a car model"; } } Car::model(); Class Taxi extends Car { protected static function getModel(){ echo "This is a Taxi model"; } } Taxi::model();
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得到输出
This is a car model This is a Taxi model
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可以看到,在调用static,子类哪怕调用的是父类的方法,但是父类方法中调用的方法还会是子类的方法(好绕嘴。。)
在PHP5.3版本以前,static和self还是有一点区别,具体是什么,毕竟都是7版本的天下了。就不去了解了。
总结呢就是:self只能引用当前类中的方法,而static关键字允许函数能够在运行时动态绑定类中的方法。
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