run code in 200+ php & hhvm versions
<?php for($i=0; $i<256; $i++) echo !ord(chr($i)) == $i;

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)