如何注册/收集父母和子女班级？

Question

I am looking for a good way to auto hook child classes from a parent class in WordPress.

I'm creating a plugin with some different templates and I would like to gather all the child template classes in an array so I can list them.

class template {
    // Methods
}

class name1 extends template {
    // Methods
}

class name2 extends template {
    // Methods
}

class name3 extends template {
    // Methods
}

Answer 1

You could use get_declared_classes() (link to docs).

Then iterate the result and see which of the returned classes is a a children of your template class.

E.g.:

// given these classes

class father {}
class child1 extends father {}
class child2 extends father {}
class child3 extends father {}
class notMe {}

// you could have an utility function like this

function getChildrenOf(string $parentClass): array {

    if (!class_exists($parentClass)) {
       return [];
    }

    $classes = array_filter(get_declared_classes(), function($class) use($parentClass) {

        return is_a($class, $parentClass, true);
    });

    return $classes;
}

// which you could use like this

$childrenClasses = getChildrenOf(father::class);

var_dump($childrenClasses);

You can see it all working together here.