3v4l.org

run code in 300+ PHP versions simultaneously
<?php $URLdate = "2016-03-21"; $URL = date("Y_m_d",strtotime("last Monday", strtotime($URLdate))) . '.html'; echo $URL;
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
2016_03_14.html
preferences:
222.25 ms | 404 KiB | 332 Q