run code in 200+ php & hhvm versions
Bugs & Features
<?php function test() { return null; } function call() { a = test(); if (!a) { return 4221412; } } call();
based on Cl9K5

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)