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
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