create transpose matrix using php [duplicate]

Answer 1

I believe this works with rectangular arrays as well. The trick: return array_map(null, ...$squareArray); seems to work in an unexpected way for a single column array

function RotateSquare2DArray($squareArray) 
{

    if ($squareArray == null) { return null; }
    $rotatedArray = array();
    $r = 0;

    foreach($squareArray as $row) {
        $c = 0;
        if (is_array($row)) {
            foreach($row as $cell) {
                $rotatedArray[$c][$r] = $cell;
                ++$c;
            }
        }
        else $rotatedArray[$c][$r] = $row;
        ++$r;
    }
    return $rotatedArray;
}

If the array is associative, I use this

function RotateSquareAssociativeArray($squareArray)
{
    if ($squareArray == null) { return null; }
    $rotatedArray = array();
    $r = 0;

    foreach($squareArray as $c=>$row) {
        if (is_array($row)) {
            foreach($row as $key=>$cell) {
                $rotatedArray[$key][$c] = $cell;
            }
        }
        else {
            $rotatedArray[$c][$r] = $row;
        }
        ++$r;
    }
    return $rotatedArray;
}