run code in 200+ php & hhvm versions
Bugs & Features
<?php class A { private function __construct() {} } class B { final private function __construct() {} } class C extends A { public function __construct() {} } class D extends B { public function __construct() {} } var_dump(new C()); var_dump(new D());

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).
Note: hhvm uses a JIT which only kicks in after a few runs. Since we run scripts only once, hhvm always runs slower.

VersionSystem time (s)User time (s)Memory (MiB)