字符串函数
PHP Manual

number_format

(PHP 4, PHP 5)

number_formatFormat a number with grouped thousands

说明

string number_format ( float $number [, int $decimals = 0 ] )
string number_format ( float $number , int $decimals = 0 , string $dec_point = '.' , string $thousands_sep = ',' )

This function accepts either one, two, or four parameters (not three):

If only one parameter is given, number will be formatted without decimals, but with a comma (",") between every group of thousands.

If two parameters are given, number will be formatted with decimals decimals with a dot (".") in front, and a comma (",") between every group of thousands.

If all four parameters are given, number will be formatted with decimals decimals, dec_point instead of a dot (".") before the decimals and thousands_sep instead of a comma (",") between every group of thousands.

返回值

A formatted version of number.

参数

number

The number being formatted.

decimals

Sets the number of decimal points.

dec_point

Sets the separator for the decimal point.

This function only takes the first byte for the separator. This means that multibyte characters will NOT work, resulting in a broken multibyte sequence.

thousands_sep

Sets the thousands separator.

Only the first byte of thousands_sep is used. For example, if you use & as thousands_sep on the number 1000, number_format() will return 1&000.

As noted above in the description of the dec_point parameter, then this function is not multibyte aware so using multibyte characters as separators will result in broken sequences.

范例

Example #1 number_format() Example

For instance, French notation usually use two decimals, comma (',') as decimal separator, and space (' ') as thousand separator. This is achieved with this line :

<?php

$number 
1234.56;

// english notation (default)
$english_format_number number_format($number);
// 1,235

// French notation
$nombre_format_francais number_format($number2','' ');
// 1 234,56

$number 1234.5678;

// english notation without thousands seperator
$english_format_number number_format($number2'.''');
// 1234.57

?>

参见


字符串函数
PHP Manual