(PHP 4, PHP 5)
number_format — Format a number with grouped thousands
$number
   [, int $decimals = 0
  ] )$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.
  
numberThe number being formatted.
decimalsSets the number of decimal points.
dec_pointSets the separator for the decimal point.
thousands_sepSets the thousands separator.
   A formatted version of number.
  
| Version | Description | 
|---|---|
| 5.4.0 | This function now supports multiple bytes in dec_pointandthousands_sep. Only the first byte of each
        separator was used in older versions. | 
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
?>