3v4l.org

run code in 300+ PHP versions simultaneously
<?php print(date('Y w', strtotime('Monday'))."\n"); print(date('Y w', strtotime('Monday this week'))."\n"); print(date('Y w', strtotime('this Monday'))."\n"); print(date('Y w', strtotime('last Monday'))."\n");
Output for 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
2016 1 2016 1 2016 1 2015 1
preferences:
193.01 ms | 404 KiB | 220 Q