instanceof 判斷后代子類 >[info]判斷左邊的對象是否是右邊類的后代(實例化的結果) * * * ``` class Person { ?public $name = '蒼老師'; } class Boy extends Person { ?public $name = '小澤澤'; } class Girl { ?public $name = '小靜靜'; } // 實例化Person類 $p = new Person; $b = new Boy; $g = new Girl; var\_dump($p instanceof Person);?// true var\_dump($b instanceof Person);?// true var\_dump($g instanceof Person);?// false var\_dump($p instanceof Boy);?// false ```