<?php function swapOutermost(&$a) { if(count($a) < 2){ return; } $len = count($a); $temp = $a[0]; $a[0] = $a[$len - 1]; $a[$len - 1] = $temp; swapOutermost(array_slice($a, 1, $len - 2)); } $array = [1, 2, 3, 4, 5, 6, 7]; swapOutermost($array); var_export($array);
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