3v4l.org

run code in 300+ PHP versions simultaneously
<?php for ($t = 1483228800000; $t <= strtotime("now +1 year")*1000; $t=strtotime('+1 month', $t/1000)*1000) { echo $t.","; }
Output for 5.6.0 - 5.6.29, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 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
1483228800000,1485907200000,1488326400000,1491001200000,1493593200000,1496271600000,1498863600000,1501542000000,1504220400000,1506812400000,1509494400000,1512086400000,1514764800000,
Output for 7.3.32 - 7.3.33, 8.0.13
1483228800000,1485907200000,1488326400000,1491004800000,1493596800000,1496275200000,1498867200000,1501545600000,1504224000000,1506816000000,1509494400000,1512086400000,1514764800000,
preferences:
168.22 ms | 402 KiB | 189 Q