PHP中双冒号和箭头运算符之间的区别? [英] Difference between double colon and arrow operators in PHP?

问题描述

在php网络手册的边栏中，链接文本 addChild方法使用::范围解析运算符，但是在示例中，它使用Arrow运算符.谁能告诉我为什么?

In the sidebar of the php web manual, link text the addChild method uses the :: scope resolution operator, but in the example it uses the Arrow operator. Can anyone tell me why that is?

推荐答案

::用于静态元素，而->用于实例元素.

:: is for static elements while -> is for instance elements.

例如:

class Example {
  public static function hello(){
    echo 'hello';
  }
  public function world(){
    echo 'world';
  }
}

// Static method, can be called from the class name
Example::hello();

// Instance method, can only be called from an instance of the class
$obj = new Example();
$obj->world();

有关静态概念的更多信息

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