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<?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 for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 7, 1 => 6, 2 => 5, 3 => 4, 4 => 3, 5 => 2, 6 => 1, )

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