PHP function to convert RMB from lowercase to uppercase, no length limit, accurate to minutes (recommended)

This article introduces a function implemented in PHP to convert RMB from lower case to upper case. There is no limit on the length of the number and it can be accurate to the minute. Friends in need, please refer to it.

When printing invoices or displaying bills, it is often necessary to convert the RMB amount from lowercase to uppercase.

The following is an improved function for converting RMB from lower case to upper case. The function is as follows: 1. Supports astronomical numbers, and integer digits can theoretically be infinitely long; 2. Supports decimals. For currency, it is generally accurate to two decimal places. You can set whether the decimal places are rounded; 3. Support custom currency units. Some systems require the capital to be "Yuan", and some require "Yuan", which can be customized; 4. Supports the custom padding of "zero" at the end of numbers that end with integers and contain decimals. For example, some systems require that a number such as 1960.30 be converted to uppercase to be "one thousand, nine hundred, six, ten yuan and three cents", while some systems require The requirement is "One thousand nine hundred six hundred yuan and zero thirty cents". In both cases, it is correct according to the "basic regulations for correctly filling in bills and settlement vouchers", and can now be customized.

Example code:

 <?php
    /**
     * 人民币小写转大写
     *
     * @param string $number 数值
     * @param string $int_unit 币种单位，默认"元"，有的需求可能为"圆"
     * @param bool $is_round 是否对小数进行四舍五入
     * @param bool $is_extra_zero 是否对整数部分以0结尾，小数存在的数字附加0,比如1960.30，
     *             有的系统要求输出"壹仟玖佰陆拾元零叁角"，实际上"壹仟玖佰陆拾元叁角"也是对的
     * @return string
     * @site bbs.it-home.org
     */
    function num2rmb($number = 0, $int_unit = '元', $is_round = TRUE, $is_extra_zero = FALSE)
    {
        // 将数字切分成两段
        $parts = explode('.', $number, 2);
        $int = isset($parts[0]) ? strval($parts[0]) : '0';
        $dec = isset($parts[1]) ? strval($parts[1]) : '';

        // 如果小数点后多于2位，不四舍五入就直接截，否则就处理
        $dec_len = strlen($dec);
        if (isset($parts[1]) && $dec_len > 2)
        {
            $dec = $is_round
                    ? substr(strrchr(strval(round(floatval("0.".$dec), 2)), '.'), 1)
                    : substr($parts[1], 0, 2);
        }

        // 当number为0.001时，小数点后的金额为0元
        if(empty($int) && empty($dec))
        {
            return '零';
        }

        // 定义
        $chs = array('0','壹','贰','叁','肆','伍','陆','柒','捌','玖');
        $uni = array('','拾','佰','仟');
        $dec_uni = array('角', '分');
        $exp = array('', '万');
        $res = '';

        // 整数部分从右向左找
        for($i = strlen($int) - 1, $k = 0; $i >= 0; $k++)
        {
            $str = '';
            // 按照中文读写习惯，每4个字为一段进行转化，i一直在减
            for($j = 0; $j < 4 && $i >= 0; $j++, $i--)
            {
                $u = $int{$i} > 0 ? $uni[$j] : ''; // 非0的数字后面添加单位
                $str = $chs[$int{$i}] . $u . $str;
            }
            //echo $str."|".($k - 2)."<br>";
            $str = rtrim($str, '0');// 去掉末尾的0
            $str = preg_replace("/0+/", "零", $str); // 替换多个连续的0
            if(!isset($exp[$k]))
            {
                $exp[$k] = $exp[$k - 2] . '亿'; // 构建单位
            }
            $u2 = $str != '' ? $exp[$k] : '';
            $res = $str . $u2 . $res;
        }

        // 如果小数部分处理完之后是00，需要处理下
        $dec = rtrim($dec, '0');

        // 小数部分从左向右找
        if(!empty($dec))
        {
            $res .= $int_unit;

            // 是否要在整数部分以0结尾的数字后附加0，有的系统有这要求
            if ($is_extra_zero)
            {
                if (substr($int, -1) === '0')
                {
                    $res.= '零';
                }
            }

            for($i = 0, $cnt = strlen($dec); $i < $cnt; $i++)
            {
                $u = $dec{$i} > 0 ? $dec_uni[$i] : ''; // 非0的数字后面添加单位
                $res .= $chs[$dec{$i}] . $u;
            }
            $res = rtrim($res, '0');// 去掉末尾的0
            $res = preg_replace("/0+/", "零", $res); // 替换多个连续的0
        }
        else
        {
            $res .= $int_unit . '整';
        }
        return $res;
    }

    echo "<pre class="brush:php;toolbar:false">";
    $number = "1000000000000000012345678900.501";
    echo $number.":".num2rmb($number);
    echo "\n";
    $number = "1960.30";
    echo $number.":".num2rmb($number);
    echo "\n";
    $number = "1960.30";
    echo $number.":".num2rmb($number, "圆", true, true);
    echo "\n";
    $number = "123456789.005";
    echo $number.":".num2rmb($number);
    echo "\n";
    $number = "123456789.005";
    echo $number.":".num2rmb($number, "元", false);
    echo "\n";
    $number = "10000000000000000060009.101";
    echo $number.":".num2rmb($number);
    echo "\n";
    $number = "1680.32";
    echo $number.":".num2rmb($number);
?>

Output result: 1000000000000000012345678900.501: One thousand billion billion billion zero one hundred two hundred three hundred million four thousand five hundred six hundred and seventy-eight thousand eight thousand nine hundred yuan five cents 1960.30: One thousand nine hundred dollars and three cents 1960.30: One thousand nine hundred yuan, ten yuan and three cents 123456789.005: One hundred and twenty-three hundred and four hundred and fifty thousand six thousand and seven hundred and eighty-nine dollars and one cent 123456789.005: One hundred and twenty-three hundred and four hundred and fifty thousand six thousand and seven hundred and eighty-nine yuan 10000000000000000060009.101: One hundred trillion billion six million zero nine yuan one dime 1680.32: One thousand sixty-eight dollars, three cents and two cents