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ReflectionClass::isSubclassOf

(PHP 5, PHP 7, PHP 8)

ReflectionClass::isSubclassOf — Checks if a subclass

Description

public ReflectionClass::isSubclassOf(ReflectionClass|string $class): bool

Checks if the class is a subclass of a specified class or implements a specified interface.

Parameters

class: Either the name of the class as string or a ReflectionClass object of the class to check against.

Return Values

Returns true on success or false on failure.

See Also

ReflectionClass::isInterface() - Checks if the class is an interface
ReflectionClass::implementsInterface() - Implements interface
is_subclass_of() - Checks if the object has this class as one of its parents or implements it
get_parent_class() - Retrieves the parent class name for object or class

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User Contributed Notes 2 notes

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2

dhairya lakhera ¶

8 years ago

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

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voitcus at gmail dot com ¶

5 years ago

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