3v4l.org

run code in 300+ PHP versions simultaneously
<?php for ($i=0; $i<=12; $i++) { echo '<option value="'.date('Y-m-d', strtotime("-$i month")).'">'.date('Y-m', strtotime("-$i month")).'</option>'; }
Output for 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 - 7.2.34, 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 - 8.2.18, 8.3.0 - 8.3.6
<option value="2023-10-09">2023-10</option><option value="2023-09-09">2023-09</option><option value="2023-08-09">2023-08</option><option value="2023-07-09">2023-07</option><option value="2023-06-09">2023-06</option><option value="2023-05-09">2023-05</option><option value="2023-04-09">2023-04</option><option value="2023-03-09">2023-03</option><option value="2023-02-09">2023-02</option><option value="2023-01-09">2023-01</option><option value="2022-12-09">2022-12</option><option value="2022-11-09">2022-11</option><option value="2022-10-09">2022-10</option>

preferences:
216.1 ms | 405 KiB | 385 Q