3v4l.org

run code in 300+ PHP versions simultaneously
<?php $date=date('Y-m'); var_dump($date); var_dump(date('Y-m'),strtotime("$date -1 month")); ?>
Output for 5.2.7 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(7) "2013-10" string(7) "2013-10" int(1377986400)
Output for 7.3.32 - 7.3.33, 7.4.26, 8.0.13
string(7) "2013-10" string(7) "2013-10" int(1377993600)
Output for 5.2.0 - 5.2.6
string(7) "2013-10" string(7) "2013-10" int(1380232800)
Output for 5.1.0 - 5.1.6
string(7) "2013-10" string(7) "2013-10" int(1380348780)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5
string(7) "2013-10" string(7) "2013-10" int(1383260400)
preferences:
309.13 ms | 402 KiB | 460 Q