**一.Class魔术常量语法** ``` ::class ```   **二.实例** 1.static中的本类 ``` public static function say(){ echo self::class; } ``` 2.普通方法中获取本类名 ``` public function show(){ echo $this::class; } public function show(){ echo self::class; } ``` 3.外类获取类名 ``` echo Person::class; echo $obj::class; ```