class A {}
class B {}
class C extends B {}
$obj=new ReflectionClass('C');
var_dump($obj->isSubclassOf ('A')); //boolean false
var_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。
成功时返回 true
, 或者在失败时返回 false
。
class A {}
class B {}
class C extends B {}
$obj=new ReflectionClass('C');
var_dump($obj->isSubclassOf ('A')); //boolean false
var_dump($obj->isSubclassOf ('B')); //boolean true
Note, 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($b)); // false
var_dump($AA instanceof $BB); // false
var_dump($b->isSubclassOf($a)); // true
var_dump($BB instanceof $AA); // true
var_dump($a->isSubclassOf($a)); // false
var_dump($AA instanceof $AA); // true