Parsing the money_format () function in PHP

In PHP, we often need to format numbers into currency strings. In this case, we need to use PHP's built-in function money_format() function. This article will take you to take a look at this function. First, let's take a look at the syntax of this function:

money_format ( string $format , float $number )

• $format: Specifies the string to be formatted and how to format the variables in the string. Single % character optional flags optional field width optional, left precision optional, right precision required, single conversion character.

• $number: The number that needs to be formatted.

• Return value: Returns the formatted characters. Characters before and after the format string will be returned unchanged. If the number passed in is not a number, null will be returned and E_WARNING will be generated.

Note: money_format() function This function wraps strfmon() in the C function library, only It is defined that it can only be used when the system running this function has the strfmon function, but the Windows system does not. All money_format() is available in Windows is not defined, resulting in an undefined error. Or the php version you are using is lower than 4.3.

1. The use of positive numbers

<?php
$number = 1234.56;
// 打印 en_US locale 的国际化格式
setlocale(LC_MONETARY, &#39;en_US&#39;);
echo money_format(&#39;%i&#39;, $number) . "\n";
// USD 1,234.56

// 打印意大利国家的格式，带两位浮点小数`
setlocale(LC_MONETARY, &#39;it_IT&#39;);
echo money_format(&#39;%.2n&#39;, $number) . "\n";
// Eu 1.234,56
?>

2. The use of negative numbers

<?php
$number = -1234.5672;
// 美国国家的格式，使用圆括号 () 标记负数。
// 左侧精度使用十位
setlocale(LC_MONETARY, &#39;en_US&#39;);
echo money_format(&#39;%(#10n&#39;, $number) . "\n";
// ($        1,234.57)

// 相似的格式，添加了右侧两位小数点的精度，同时用 * 来填充
echo money_format(&#39;%=*(#10.2n&#39;, $number) . "\n";
// ($********1,234.57)

3. Add some introduction before and after the format string

<?php
setlocale(LC_MONETARY, &#39;en_GB&#39;);
$fmt = &#39;The final value is %i (after a 10%% discount)&#39;;
echo money_format($fmt, 1234.56) . "\n";
// The final value is  GBP 1,234.56 (after a 10% discount)

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