3v4l.org

run code in 500+ PHP versions simultaneously
<?php $arr = ['a','b','c','d','e','f']; $res = array(); $size = count($arr); for($i=$size-1;$i>=0;$i--){ $arr[$size] = $arr[$i]; unset($arr[$i]); $size++; } var_dump($arr);
Output for 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 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.33, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
array(6) { [6]=> string(1) "f" [7]=> string(1) "e" [8]=> string(1) "d" [9]=> string(1) "c" [10]=> string(1) "b" [11]=> string(1) "a" }
preferences:
33.54 ms | 1136 KiB | 8 Q