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run code in 300+ PHP versions simultaneously
<?php class B extends A { const A = 'a'; } class C extends B { const B = 'b'; } abstract class A { public static function get() { self::resolve(); } private static function resolve() { $r = new ReflectionClass(get_called_class()); var_dump($r->getConstants()); } } A::get(); B::get(); C::get();

preferences:
46.6 ms | 402 KiB | 5 Q