/** * 格式化金额 * * @param int $money * @param int $len * @param string $sign * @return string */function format_money($money, $len=2, $sign='￥'){    $negative = $money > 0 ? '' : '-';    $int_money = intval(abs($money));    $len = intval(abs($len));    $decimal = '';//小数    if ($len > 0) {        $decimal = '.'.substr(sprintf('%01.'.$len.'f', $money),-$len);    }    $tmp_money = strrev($int_money);    $strlen = strlen($tmp_money);    for ($i = 3; $i < $strlen; $i += 3) {        $format_money .= substr($tmp_money,0,3).',';        $tmp_money = substr($tmp_money,3);    }    $format_money .= $tmp_money;    $format_money = strrev($format_money);    return $sign.$negative.$format_money.$decimal;} 源文地址：http://www.cnblogs.com/jackoogle/p/4265825.html