Online PHP editor | output for NoPDi

<?php class A { public function x(): int { return 5; } } $cl = get_class(new class() { public function x(): int { return 6; } }); $createProxy = function(string $class): string { $resName = 'Proxy_' . md5($class); class_alias($class, $resName . '_alias'); eval('class ' . $resName . ' extends ' . $resName . '_alias { public function x(): int { return 7; } }'); return $resName; }; $proxyCl = $createProxy($cl); var_dump((new $cl)->x()); var_dump((new $proxyCl)->x());