Question

是否存在可用的money_format的任意精度替代，可以使用字符串而不是浮点作为参数？

并不是我计划对数万亿的货币单位进行计算，但是在经历了麻烦以便在不滥用浮点数的情况下正确处理货币算术之后，有一个函数不会随意喷出随机数字。 15位，即使用户决定给它无意义的数据。或者，嘿，也许有人想在Zimbabwe dollars购买两支的口香糖？

我对使用正则表达式犹豫不决，因为我希望利用money_format的本地化。

编辑 - 找到了可行的解决方案;见下文

Answer 1

尝试NumberFormatter课程

Answer 2

从PHP网站here和here上的评论者提交的函数拼凑而成。编辑使用任意精度参数。

class format {
    function money($format, $number) 
    { 
        // Takes plain-format, arbitrary-length decimal string (eg: '123456789123456789.123456')
        // Returns localized monetary string, truncated at the hundredth value after the decimal point.
        // (eg: $ 123,456,789,123,456,789.12)
        $regex  = '/%((?:[\^!\-]|\+|\(|\=.)*)([0-9]+)?'. 
                  '(?:#([0-9]+))?(?:\.([0-9]+))?([in%])/'; 
        if (setlocale(LC_MONETARY, 0) == 'C') { 
            setlocale(LC_MONETARY, ''); 
        } 
        $locale = localeconv(); 
        preg_match_all($regex, $format, $matches, PREG_SET_ORDER); 
        foreach ($matches as $fmatch) { 
            $value = (string) $number;
            $flags = array( 
                'fillchar'  => preg_match('/\=(.)/', $fmatch[1], $match) ? 
                               $match[1] : ' ', 
                'nogroup'   => preg_match('/\^/', $fmatch[1]) > 0, 
                'usesignal' => preg_match('/\+|\(/', $fmatch[1], $match) ? 
                               $match[0] : '+', 
                'nosimbol'  => preg_match('/\!/', $fmatch[1]) > 0, 
                'isleft'    => preg_match('/\-/', $fmatch[1]) > 0 
            ); 
            $width      = trim($fmatch[2]) ? (int)$fmatch[2] : 0; 
            $left       = trim($fmatch[3]) ? (int)$fmatch[3] : 0; 
            $right      = trim($fmatch[4]) ? (int)$fmatch[4] : $locale['int_frac_digits']; 
            $conversion = $fmatch[5]; 

            $positive = true; 
            if ($value[0] == '-') { 
                $positive = false; 
                $value  = bcmul($value, '-1');
            } 
            $letter = $positive ? 'p' : 'n'; 

            $prefix = $suffix = $cprefix = $csuffix = $signal = ''; 

            $signal = $positive ? $locale['positive_sign'] : $locale['negative_sign']; 

            if ($locale["{$letter}_sign_posn"] == 1 && $flags['usesignal'] == '+')
                $prefix = $signal; 
            elseif ($locale["{$letter}_sign_posn"] == 2 && $flags['usesignal'] == '+') 
                $suffix = $signal; 
            elseif ($locale["{$letter}_sign_posn"] == 3 && $flags['usesignal'] == '+')
                $cprefix = $signal; 
            elseif ($locale["{$letter}_sign_posn"] == 4 && $flags['usesignal'] == '+')
                $csuffix = $signal; 
            elseif ($flags['usesignal'] == '(' || $locale["{$letter}_sign_posn"] == 0) {
                $prefix = '('; 
                $suffix = ')'; 

            } 
            if (!$flags['nosimbol']) { 
                $currency = $cprefix . 
                            ($conversion == 'i' ? $locale['int_curr_symbol'] : $locale['currency_symbol']) . 
                            $csuffix; 
            } else { 
                $currency = ''; 
            } 
            $space  = $locale["{$letter}_sep_by_space"] ? ' ' : ''; 

            $value = format::number($value, $right, $locale['mon_decimal_point'], 
                     $flags['nogroup'] ? '' : $locale['mon_thousands_sep']);

            $value = @explode($locale['mon_decimal_point'], $value); 

            $n = strlen($prefix) + strlen($currency) + strlen($value[0]); 
            if ($left > 0 && $left > $n) { 
                $value[0] = str_repeat($flags['fillchar'], $left - $n) . $value[0]; 
            } 
            $value = implode($locale['mon_decimal_point'], $value); 
            if ($locale["{$letter}_cs_precedes"]) { 
                $value = $prefix . $currency . $space . $value . $suffix; 
            } else { 
                $value = $prefix . $value . $space . $currency . $suffix; 
            } 
            if ($width > 0) { 
                $value = str_pad($value, $width, $flags['fillchar'], $flags['isleft'] ? 
                         STR_PAD_RIGHT : STR_PAD_LEFT); 
            } 

            $format = str_replace($fmatch[0], $value, $format); 
        } 
        return $format; 
    } 

    function number  ($number  , $decimals = 2 , $dec_point = '.' , $sep = ',', $group=3   ){
        // Arbitrary-precision number formatting:
        // Takes plain-format, arbitrary-length decimal string (eg: '123456789123456789.123456').
        // Takes the same parameters as PHP's native number_format plus a flexible 'grouping' parameter. 
        // WARNINGS: Truncates -- does not round; not inherently locale-aware

        $num = (string) $number;   
        if (strpos($num, '.')) $num = substr($num, 0, (strpos($num, '.') + 1 + $decimals)); // truncate
        $num = explode('.',$num);
        while (strlen($num[0]) % $group) $num[0]= ' '.$num[0];
        $num[0] = str_split($num[0],$group);
        $num[0] = join($sep[0],$num[0]);
        $num[0] = trim($num[0]);
        $num = join($dec_point[0],$num);

        return $num;
    }
}

试验：

 setlocale(LC_MONETARY, 'en_ZW'); // pick your favorite hyperinflated currency
 $string = '123456789123456789.123456';

 echo "original string: " . 
  $string . "<br>";
  // 123456789123456789.123456
 echo "float cast - " . 
  ((float) $string) . "<br>";
  // 1.23456789123E+17
 echo "number_format original: " . 
  number_format($string, 4) . "<br>";
  // 123,456,789,123,456,768.0000
 echo "number_format new: " . 
  format::number($string, 4) . "<br>";
  // 123,456,789,123,456,789.1234
 echo "money_format original: " . 
  money_format('%n', $string) . "<br>";
  // Z$ 123,456,789,123,456,784.00 
 echo "money_format new: " . 
  format::money('%n',$string) . "<br>";
  // Z$ 123,456,789,123,456,789.12

任意精确数字格式/ money_format？

2 个答案: