The difference between class static call and scope resolution operator in PHP

This article mainly introduces the difference between class static calling and range resolution operators in PHP. Friends who need it can refer to it. I hope it can help everyone.

The specific code is as follows:

<?php
//在子类或类内部用“::”调用本类或父类时，不是静态调用方法，而是范围解析操作符。
class ParentClass {
 public static $my_static = &#39;parent var &#39;;
 function test() {
  self::who(); // 输出 &#39;parent&#39; 是范围解析，不是静态调用
  $this->who(); // 输出 &#39;child&#39;
  static::who(); // 延迟静态绑定 是范围解析，不是静态调用
 }
 function who() {
  echo &#39;parent<br>&#39;;
 }
}
class ChildClass extends ParentClass {
 public static $my_static = &#39;child var &#39;;
 function who() {
  echo &#39;child<br>&#39;;
 }
}
$obj = new ChildClass();
$obj->test();
echo ChildClass::$my_static;//静态调用

The above output

parent

child

child

child var

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