3v4l.org

run code in 300+ PHP versions simultaneously
<?php $m= date("m"); $de= date("d"); $y= date("Y"); $svnumber=array(); for($i=0; $i<=6; $i++){ $date=date('Y-m',mktime(0,0,0,($m-$i),$y)); echo $date.'\n'; }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 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 - 5.6.38, 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
2020-01\n2019-12\n2019-11\n2019-10\n2019-09\n2019-08\n2019-07\n

preferences:
281.92 ms | 405 KiB | 448 Q