how to obtain all subclasses of a class in php

Question

Is it possible to get all subclasses of given class in php?

You mean like "hey, PHP, what subclasses are out there for class MyBaseClass"? Probably not, because they may live in files that aren't loaded. — sblom, Aug 12 '10 at 16:48

score 36 · Accepted Answer · edited May 23 '17 at 10:30

36

function getSubclassesOf($parent) {
    $result = array();
    foreach (get_declared_classes() as $class) {
        if (is_subclass_of($class, $parent))
            $result[] = $class;
    }
    return $result;
}

Coincidentally, this implementation is exactly the one given in the question linked to by Vadim.

edited May 23 '17 at 10:30

Community

1
1

answered Aug 12 '10 at 16:49

Artefacto

96,375
17
202
225

2

Yes, it's just necessary to keep in mind it will only work if the files defining these classes are already (auto)loaded. Great code though. – Camilo Martin Dec 09 '13 at 03:38

score 3 · Answer 2 · answered Mar 09 '20 at 15:02

3

Using PHP 7.4:

$children = array_filter(get_declared_classes(), fn($class) => is_subclass_of($class, MyClass::class));

answered Mar 09 '20 at 15:02

celsowm

846
9
34
59

Looks like PHP 8.0 for me. But still upvoting because of the clean oneliner alternative – Mark Walet Aug 25 '21 at 11:31

score -2 · Answer 3 · answered Apr 01 '20 at 13:09

-2

function getClassNames(string $className): array
{
    $ref = new ReflectionClass($className);
    $parentRef = $ref->getParentClass();

    return array_unique(array_merge(
        [$className],
        $ref->getInterfaceNames(),
        $ref->getTraitNames(),
        $parentRef ?getClassNames($parentRef->getName()) : []
    ));
}

answered Apr 01 '20 at 13:09

gskema

3,141
2
20
39

The request is for the child classes, not the parent class. – reinierpost Jun 12 '23 at 15:12

how to obtain all subclasses of a class in php

3 Answers3

Linked