- array_reverse: documentation ( source)
- var_export: documentation ( source)
<?php
$array = [[1,2,3,4],[1,2,3,4],[3,4,5,6],[3,4,5,6]];
$result = [];
foreach ($array as $row) {
foreach (array_reverse($row) as $i => $v) {
$result[$i][] = $v;
}
}
var_export($result);