run code in 200+ php & hhvm versions
Bugs & Features
<?php function foo(&$http_response_header) { file_get_contents('http://www.google.com'); } $x = null; foo($x); var_dump($x);
based on k7e5N

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)