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.

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User Contributed Notes 2 notes

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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