run code in 200+ php & hhvm versions
Bugs & Features
<?php $value = '3.5'; if ($value != '') { $css_class = substr($value, 0, 1) . substr($value, 2, 1); } echo $css_class;
based on Bu0Cq

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)