run code in 200+ php & hhvm versions
Bugs & Features
<?php class Foo { private $bar; } $foo = new Foo(); $friend = Closure::bind(function & (Foo $foo) use (& $friend) { return & $foo->bar; }, null, 'Foo')->__invoke($foo); var_dump($foo); $friend = 'baz'; var_dump($foo);

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)