3v4l.org

run code in 300+ PHP versions simultaneously
<?php $yr = "2013"; $week = "53"; $day = date("N", strtotime("Monday")); echo date("Y-m-d", strtotime($yr . "W" . $week . $day)); // "2014W011"
Output for 5.1.1 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 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
2013-12-30
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/1MRR4 on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5
2013-01-30
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
1970-01-01
preferences:
246.61 ms | 402 KiB | 400 Q