->和有什么区别?和::在PHP中? [英] What is the difference between -> and :: in PHP?

问题描述

这个东西困扰了我很久了，我在任何地方都找不到！

This thing has been bugging me for long and I can't find it anywhere!

在PHP中使用::和->

What is the difference when using classes in php between :: and ->

让我举个例子.

想象一下一个名为MyClass的类，该类中有一个函数myFunction

Imagine a class named MyClass and in this class there is a function myFunction

使用之间有什么区别

MyClass myclass = new MyClass
myclass::myFunction();

或

MyClass myclass = new MyClass
myclass->myFunction();

谢谢

推荐答案

如上所述，"::"用于静态方法调用，而->"用于实例方法调用

as stated, "::" is for static method calls whereas "->" is for instance method calls

除了使用parent ::访问基类中的函数外，其中"parent ::"可用于静态和非静态父方法

except for when using parent:: to access functions in a base class, where "parent::" can be used for both static and non-static parent methods

abstract class myParentClass
{
   public function foo()
   {
      echo "parent class";
   }
}

class myChildClass extends myParentClass
{
   public function bar()
   {
      echo "child class";
      parent::foo();
   }
}

$obj = new myChildClass();
$obj->bar();

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