Online PHP editor | refs for 9gfps

<?php class A { public static $data = ['a']; public static function getData() { $classes = class_parents($class); $classes[] = get_called_class(); return call_user_func_array('array_merge', array_map( function($class) { return $class::$data; }, $classes ) ); } } class B extends A { public static $data = ['b']; } class C extends B { public static $data = ['c']; } class D extends C { public static $data = ['d']; } var_dump(A::getData()); var_dump(B::getData()); var_dump(C::getData()); var_dump(D::getData());