run code in 200+ php & hhvm versions
Bugs & Features
<?php abstract class A { /** @var int */ public $foo; private function __construct() { $this->foo = 5; } } class B extends A { } class C extends B { public function __construct() { parent::__construct(); } } new C();

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)