3v4l.org

run code in 300+ PHP versions simultaneously
<?php $input = new \DateTime('2017-07-17'); $firstDayOfMonth = new \DateTime($input->format('Y-m-01')); $order = (int)($input->format('n') / 7) + 1; var_dump($input->format('l')); var_dump($input->format('n') / 7 + 1);

preferences:
31.73 ms | 402 KiB | 5 Q