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@ 2020-02-08T09:29:20Z

<?php

function swapOutermost(&$a, $i = 0) {
    $last = count($a) - 1 - $i;
    if ($i < $last) {
        [$a[$i], $a[$last]] = [$a[$last], $a[$i]];
        swapOutermost($a, ++$i);
    }
}

$array = [1, 2, 3, 4, 5, 6, 7];
swapOutermost($array);
var_export($array);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

109.7 ms | 1490 KiB | 5 Q