public function sortArrayByColumn(&$arr, $col)
    {
        $newArray = [];
        $sort_col = array();
        foreach ($arr as $key => $row) {
            $sort_col[$key] = strtoupper($row[$col]);
        }
        asort($sort_col, SORT_LOCALE_STRING);

        foreach ($sort_col as $key => $val) {
            $newArray[$key] = $arr[$key];
        }

        $arr = $newArray;
    }