public static function numtochr($num,$mode=true) {
    $char = array("零","一","二","三","四","五","六","七","八","九");
    $dw = array("","十","百","千","","萬","億","兆");
    $dec = "點";
    $retval = "";
    if($mode)
        preg_match_all("/^0*(\d*)\.?(\d*)/",$num, $ar);
    else
        preg_match_all("/(\d*)\.?(\d*)/",$num, $ar);

    if($ar[1][0] != "") {
        $str = strrev($ar[1][0]);
        for($i=0;$i<strlen($str);$i++) {
            $out[$i] = $char[$str[$i]];
            if($mode) {
                $out[$i] .= $str[$i] != "0"? $dw[$i%4] : "";
                if($str[$i]+$str[$i-1] == 0)
                    $out[$i] = "";
                if($i%4 == 0)
                    $out[$i] .= $dw[4+floor($i/4)];
            }
        }
        $retval = join("",array_reverse($out)) . $retval;
    }
    return $retval;
}