PHP - how to flip the rows and columns of a 2D array

Question

Normally I\'d be asking how to turn something like this:

1      2        3
4      5        6
7      8        9
10    11       12

Into this:

Answer 1

falvarez, the ZOrderToNOrder function does not work correctly when one or more columns have got one more element that other columns (other > 1).

i think this code fix it:

public static function ZOrderToNOrder($array, $columns) {
    $numElements = count($array);

    $maxRows = array();
    for ($i = 0; $i < $columns; $i++) {
        $maxRows[$i] = intval(ceil(($numElements - $i) / $columns));
    }

    $newArray = array();

    $rowCounter = 0;
    $colCounter = 0;
    foreach ($array as $element) {
        $newArray[$rowCounter][$colCounter] = $element;
        $rowCounter++;
        if ($rowCounter === $maxRows[$colCounter]) {
            $rowCounter = 0;
            $colCounter++;
        }
    }

    return self::arrayFlatten($newArray);
}

Regards,

Armando