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php面向对象编程self和static的区别,面向对象编程self
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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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