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

function flip_row_col_array($array) {
    $out = array();
    foreach ($array as  $rowkey => $row) {
        foreach($row as $colkey => $col){
            $out[$colkey][$rowkey]=$col;
        }
    }
    return $out;
}