run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = array(); $t = microtime(true); for ($i = 0; $i < 10000000; ++$i) $a[] = rand(); echo (microtime(true) - $t) / 1000000;
based on bB6vK

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)