run code in 200+ php & hhvm versions
Bugs & Features
<?php $yearMonth = '2017-06'; $firstDayOfThisMonth = new \DateTime($yearMonth . '-01'); var_dump($firstDayOfThisMonth->format('W')); $lastDayOfThisMonth = clone $firstDayOfThisMonth; $lastDayOfThisMonth = $lastDayOfThisMonth->modify('last day of this month'); var_dump($lastDayOfThisMonth->format('W')); $startDate = new \DateTime($firstDayOfThisMonth->format('Y') . 'W' . $firstDayOfThisMonth->format('W')); $endDate = new \DateTime($lastDayOfThisMonth->format('Y') . 'W' . $lastDayOfThisMonth->format('W')); $endDate->modify('+6 days'); var_dump($startDate); var_dump($endDate);
based on m5qdF

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)