CODEWITHSUNDEEP
phpoopinheritanceparent-child
Emad Ha
Emad Ha

Reputation: 1222

PHP check class parent before instantiating

What I'm trying to do is to check some class inheritance before instantiating

class A{}
class B extends A{}
class C{}

i want to check B, C classes for their inheritance before moving forward, if they inherit A then move on, otherwise i will not instantiate.

What i don't want:

// That's not what i want
$B = new B();
var_dump($B instance of A); // Valid => true

What i want:

// That's what i want
var_dump(B instance of A); // Not valid

But i'm just wondering if that's possible here.

Thanks.

Upvotes: 2

Views: 263

Answers (1)

schellingerht
schellingerht

Reputation: 5796

Yes, it's possible with:

is_subclass_of();

Example below from http://php.net/manual/en/function.is-subclass-of.php:

// usable only since PHP 5.0.3
if (is_subclass_of('WidgetFactory_Child', 'WidgetFactory')) {
   echo "yes, WidgetFactory_Child is a subclass of WidgetFactory\n";
} else {
   echo "no, WidgetFactory_Child is not a subclass of WidgetFactory\n";
}

Upvotes: 6

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