3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $dt = new DateTime('first Monday of this month'); echo $dt->format('W'); $month = "3"; $year = "2014"; $beg = (int) date('W', strtotime("first monday of $year-$month")); $end = (int) date('W', strtotime("last monday of $year-$month")); print(join(', ', range($beg, $end)));
based on 9qnsh