3v4l.org

run code in 300+ PHP versions simultaneously
<?php $startDate = "2015-08-01"; $endDate = "2015-08-31"; $startDate = strtotime($startDate); $endDate = strtotime($endDate); for($i = strtotime('Friday', $startDate); $i <= $endDate; $i = strtotime('+1 week', $i)) echo date('l Y-m-d', $i).PHP_EOL;

preferences:
53.65 ms | 402 KiB | 5 Q