class A {}class B {}class C extends B {}$obj=new ReflectionClass('C');var_dump($obj->isSubclassOf ('A')); //boolean falsevar_dump($obj->isSubclassOf ('B')); //boolean true
(PHP 5, PHP 7, PHP 8)
ReflectionClass::isSubclassOf — 检查是否为子类
检查类是否为指定类的子类，或者实现了指定的接口。
class A {}class B {}class C extends B {}$obj=new ReflectionClass('C');var_dump($obj->isSubclassOf ('A')); //boolean falsevar_dump($obj->isSubclassOf ('B')); //boolean trueNote, that this method is a bit different than the `instanceof` operator, which returns true, when it is a subclass or the very same class (interface). Here, only being a subclass results in true, eg.class A {}class B extends A {}$a = new ReflectionClass('A');$AA = new A;$b = new ReflectionClass('B');$BB = new B;var_dump($a->isSubclassOf($b)); // falsevar_dump($AA instanceof $BB); // falsevar_dump($b->isSubclassOf($a)); // truevar_dump($BB instanceof $AA); // truevar_dump($a->isSubclassOf($a)); // falsevar_dump($AA instanceof $AA); // true