number_format

    (PHP 4, PHP 5, PHP 7, PHP 8)

    number_format — 以千位分隔符方式格式化一个数字

    说明

    number_format(
        float $num,
        int $decimals = 0,
        ?string $decimal_separator = ".",
        ?string $thousands_separator = ","
    ): string

    使用四舍五入的规则，将数字格式化为千位分组和小数位（可选）。

    参数

    num

    要格式化的数字。

    decimals

    设置小数位数。如果为 0，则从返回值中忽略 decimal_separator。

    decimal_separator

    指定小数点的分隔符。

    thousands_separator

    设置千位分隔符。

    返回值

    num 的格式化版本。

    更新日志

    版本 说明
    8.0.0 在此版本之前，number_format() 接受一个、两个或四个参数（不会是三个）。
    7.2.0 number_format() 现在再也不会返回 -0，之前 num 为 -0.01 的情况下可以返回 -0。

    示例

    示例 #1 number_format() 示例

    例如，法语计数通常使用两位小数，逗号（“,”）作为小数分隔符，空格（“ ”）作为千位分隔符。以下示例展示了格式化数字的各种方法：

    <?php

    $number     = 1234.56;

    // 英文计数（默认）
    $english_format_number = number_format($number);
    // 1,235

    // 法语计数
    $nombre_format_francais = number_format($number, 2, ',', ' ');
    // 1 234,56

    $number = 1234.5678;

    // 没有千位分隔符的英文计数
    $english_format_number = number_format($number, 2, '.', '');
    // 1234.57

    ?>

    参见

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    用户贡献的备注 7 notes

    up
    423
    thomas at weblizards dot de
    15 years ago
    It's not explicitly documented; number_format also rounds:

    <?php
    $numbers     = array(0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009);
    foreach (    $numbers as $number)
    print     $number."->".number_format($number, 2, '.', ',')."<br>";
    ?>

    0.001->0.00
    0.002->0.00
    0.003->0.00
    0.004->0.00
    0.005->0.01
    0.006->0.01
    0.007->0.01
    0.008->0.01
    0.009->0.01
    up
    8
    info at ensostudio dot ru
    2 years ago
    Note: use NumberFormatter to convert in human-readable format instead user function from comments:
    <?php
    echo NumberFormatter::create('en', NumberFormatter::SPELLOUT)->format(12309); // twelve thousand three hundred nine
    echo NumberFormatter::create('ru', NumberFormatter::SPELLOUT)->format(12307.5); // двенадцать тысяч триста семь целых пять десятых
    ?>
    up
    38
    james at bandit dot co.nz
    15 years ago
    Outputs a human readable number.

    <?php
    # Output easy-to-read numbers
    # by james at bandit.co.nz
    function bd_nice_number($n) {
    // first strip any formatting;
    $n = (0+str_replace(",","",$n));

    // is this a number?
    if(!is_numeric($n)) return false;

    // now filter it;
    if($n>1000000000000) return round(($n/1000000000000),1).' trillion';
    else if(    $n>1000000000) return round(($n/1000000000),1).' billion';
    else if(    $n>1000000) return round(($n/1000000),1).' million';
    else if(    $n>1000) return round(($n/1000),1).' thousand';

    return     number_format($n);
    }
    ?>

    Outputs:

    247,704,360 -> 247.7 million
    866,965,260,000 -> 867 billion
    up
    6
    Jeroen de Bruijn [NL]
    19 years ago
    If you want to display a number ending with ,- (like 200,-) when there are no decimal characters and display the decimals when there are decimal characters i use:

    function DisplayDouble($value)
    {
    list($whole, $decimals) = split ('[.,]', $value, 2);
    if (intval($decimals) > 0)
    return number_format($value,2,".",",");
    else
    return number_format($value,0,".",",") .",-";
    }
    up
    8
    Theo Diem
    21 years ago
    formatting numbers may be more easy if u use number_format function.

    I also wrote this :
    function something($number)
    {
    $locale = localeconv();
    return number_format($number,
    $locale['frac_digits'],
    $locale['decimal_point'],
    $locale['thousands_sep']);
    }

    hope this helps =)
    []'s
    up
    20
    MarcM
    18 years ago
    For Zero fill - just use the sprintf() function

    $pr_id = 1;
    $pr_id = sprintf("%03d", $pr_id);
    echo $pr_id;

    //outputs 001
    -----------------

    $pr_id = 10;
    $pr_id = sprintf("%03d", $pr_id);
    echo $pr_id;

    //outputs 010
    -----------------

    You can change %03d to %04d, etc.
    up
    15
    stm555 at hotmail dot com
    19 years ago
    I ran across an issue where I wanted to keep the entered precision of a real value, without arbitrarily rounding off what the user had submitted.

    I figured it out with a quick explode on the number before formatting. I could then format either side of the decimal.

    <?php
    function number_format_unlimited_precision($number,$decimal = '.')
    {
    $broken_number = explode($decimal,$number);
    return     number_format($broken_number[0]).$decimal.$broken_number[1];
    }
    ?>
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