3v4l.org

run code in 300+ PHP versions simultaneously
<?php print_r(strtotime("first day"));
Output for 5.3.3 - 5.3.29, 5.4.0 - 5.4.45, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
1372298063
Output for 5.3.0 - 5.3.2
1370051663
Output for 5.2.17
1456029336
Output for 5.2.13 - 5.2.16
1456029337
Output for 5.2.8 - 5.2.12
1456029338
Output for 4.4.8 - 4.4.9, 5.2.2 - 5.2.7
1456029339
Output for 4.4.3 - 4.4.7, 5.1.5 - 5.1.6, 5.2.0 - 5.2.1
1456029340
Output for 4.4.0 - 4.4.2, 5.0.5, 5.1.0 - 5.1.4
1456029341
Output for 4.3.8 - 4.3.11, 5.0.3 - 5.0.4
1456029342
Output for 5.0.0 - 5.0.2
1456009200
Output for 4.3.0 - 4.3.7
1456029343

preferences:
331.53 ms | 401 KiB | 456 Q