Get child class namespace from superclass in PHP

Question

Assuming I have the following classes in different files:

Answer 1

In my case, I needed to create a method in parent class, that can call a static method with call_user_func() in some subclass. If you know the full class name, you can call_user_func() no problemo. The trick was to call a static method in the subclass' namespace.

So we have i.e.

\MyTools\AbstractParent
\Something\Else\Foo extends \MyTools\AbstractParent
\Something\Else\Bar extends \MyTools\AbstractParent

We now need a method in AbstractParent. This method called from subclass Foo will be able to call Bar::doMe() by prepending its own namespace.

Here is how you do it with dynamic call:

namespace MyTools;
abstract class AbstractParent {
    public static method doMe(){}

    public function callSomethingStaticInClass($class){
        // current namespace IS NOT MyTools
        // so you cannot use __NAMESPACE__
        $currentClass = get_class($this);
        $refl = new ReflectionClass($currentClass);
        $namespace = $refl->getNamespaceName();

        // now we know what the subclass namespace is...
        // so we prefix the short class name
        $class =  $namespace . '\\' . $class;
        $method = 'doMe';

        return call_user_func(array( $class, $method ));
    }

};

namespace Something\Else;
class Foo extends AbstractParent { }
class Bar extends AbstractParent { }

$foo = new Foo();
$foo->callSomethingStaticInClass('Bar');

To make it work with a static call replace get_class($this) with get_called_class()