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

小云云
小云云Original
2018-01-11 10:32:251354browse

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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