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<?php class B extends A { const A = 'a'; } class C extends B { const B = 'b'; } abstract class A { private static $constants = array(); public static function get() { self::resolve(); } private static function resolve() { if (empty() $r = new ReflectionClass(get_called_class()); var_dump($r->getConstants()); } } $arr = array(false); var_dump(in_array(false, $arr, true));