3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = range(1, 20); foreach ($array as $k => $v) { echo $v, ','; unset($array[$k]); } echo join(',', $array);
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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,
preferences:
329.47 ms | 406 KiB | 451 Q