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Homephp教程php手册双冒号 ::在PHP中的使用情况

前几天在百度知道里面看到有人问PHP中双冒号::的用法,当时给他的回答比较简洁因为手机打字不大方便!今天突然想起来,所以在这里总结一下我遇到的双冒号::在PHP

前几天在百度知道里面看到有人问PHP中双冒号::的用法,当时给他的回答比较简洁因为手机打字不大方便!今天突然想起来,所以在这里总结一下我遇到的双冒号::在PHP中使用的情况!

双冒号操作符即作用域限定操作符Scope Resolution Operator可以访问静态、const和类中重写的属性与方法。
在类定义外使用的话,使用类名调用。在PHP 5.3.0,可以使用变量代替类名。

Program List:用变量在类定义外部访问

Program List:在类定义外部使用::

程序运行结果:

Fruit Color Red

Program List:调用parent方法

showColor(); ?>

程序运行结果:

Fruit::showColor()
Apple::showColor()

Program List:使用作用域限定符

color; } } class Banana { public $color; public function __construct() { $this->color = "Banana is yellow"; } public function GetColor() { return Apple::showColor(); } } $banana = new Banana; echo $banana->GetColor(); ?>

程序运行结果:

Banana is yellow

Program List:调用基类的方法

程序运行结果:

show color

以上内容给大家详解了::在PHP中的使用情况,希望大家喜欢。

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