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 in need can refer to it

The specific code is as follows:

who(); // 输出 'child'
  static::who(); // 延迟静态绑定 是范围解析，不是静态调用
 }
 function who() {
  echo 'parent
';
 }
}
class ChildClass extends ParentClass {
 public static $my_static = 'child var ';
 function who() {
  echo 'child
';
 }
}
$obj = new ChildClass();
$obj->test();
echo ChildClass::$my_static;//静态调用

The above output

parent

child

child

child var

Summary

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