gistfile1.txt

function array_sort_bycolumn(&$array, $column, $dir = 'asc') {
    $newarr = null;
    $sortcol = array();
    foreach ($array as $a) {
        $sortcol[$a[$column]][] = $a;
    };
    ksort($sortcol);
    foreach ($sortcol as $col) {
        foreach ($col as $row)
            $newarr[] = $row;
    }
    if ($dir == 'desc')
        if ($newarr) {
            $array = array_reverse($newarr);
        } else {
            $array = $newarr;
        } else
        $array = $newarr;
    return $array;
}