Is there something like get_declared_classes_implementing()

[boen_robot]

Is there a way, prefferably a built in function, with which I can see all classes that implement a certain interface?I could use class_implements() to check if one class implements one or more interfaces, but it would take quite a few loops (when in combination with get_declared_classes()) to list all classes that implement a single interface. Even more if I had to check for more then a single interface.