<?php $a = [[4, 3, 2, 1], [5, 6, 7, 8], [12, 11, 10, 9], [13, 14, 15, 16]]; function f($a){foreach($a as$i=>$y){foreach($y as$x=>$w){$r[]=$i&1?$w:array_reverse($y)[$x];}}return $r;} print_r(f($a));
You have javascript disabled. You will not be able to edit any code.