run code in 200+ php & hhvm versions
Bugs & Features
<?php $data = ['First', 'Second', 'Third', 'Fourth', 'Fifth', 'Sixth']; $chose = []; $result = []; foreach($data as $i=>$item) { $pair = array_rand(array_diff_key($data, $chose, [$i]); $chose[] = $pair; $result[]= [$item, $data[$pair]]; var_dump($chose); } //var_dump($result);

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)