PHP特區 : [分享]格式化數字字串：number_format()

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[分享]number_format

number_format

(PHP 4, PHP 5, PHP 7)

number_format — Format a number with grouped thousands

Description

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.

Parameters

number: The number being formatted.
decimals: Sets the number of decimal points.
dec_point: Sets the separator for the decimal point.
thousands_sep: Sets the thousands separator.

Return Values

A formatted version of number.

Changelog

Version	Description
5.4.0	This function now supports multiple bytes in `dec_point` and `thousands_sep`. Only the first byte of each separator was used in older versions.

Examples

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 ( $number ,  2 ,  ',' ,  ' ' );
 // 1 234,56

 $number  =  1234.5678 ;


// english notation without thousands separator
 $english_format_number  =  number_format ( $number ,  2 ,  '.' ,  '' );
 // 1234.57

 ?>

原文出處：PHP: number_format - Manual

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