"flip (transpose) the rows and columns of a 2d array without changing the number of columns" Answer’s


Just walk the array in the correct order. Assuming you have relatively small arrays, the easiest solution is just to create a brand new array during that walk.

A solution will be of the form:

$rows = count($arr);
$ridx = 0;
$cidx = 0;

$out = array();

foreach($arr as $rowidx => $row){
    foreach($row as $colidx => $val){
        $out[$ridx][$cidx] = $val;
        if($ridx >= $rows){
            $ridx = 0;
Wednesday, March 31, 2021
answered 11 Months ago
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