PHP string number_format() function

Last Updated : 17 Mar 2025

PHP string 'number_format()' is in-built PHP function. It is used to format a number with grouped thousands. It supports one, two or three parameters (not three).

Syntax:

Parameter	Description	Required/Optional
number	The number being formatted.	Required
decimal	Set the number of decimal point.	Optional
decimalpoint	Sets the separator for the decimal point.	Optional
separator	Set the thousand separator	Optional

Example 1

<?php
$n=199.9;
echo "Your number is:".$n;
echo "<br>"."By using 'number_format()' function :".number_format($n);
?>

Output:

Your number is:199.9
By using 'number_format()' function :200

Example 2

<?php
$n=199.9;
echo "Your number is:".$n;
echo "<br>"."By using 'number_format()' function :".number_format($n,2);
?>

Output:

Your number is:199.9
By using 'number_format()' function :199.90

Example 3

<?php
$n=1000000;
echo "Your number is:".$n;
echo "<br>"."By using 'number_format()' function :".number_format($n);
?>

Output:

Your number is:1000000
By using 'number_format()' function :1,000,000

Example 4

<?php
$n=1000000;
echo "Your number is:".$n;
echo "<br>"."By using 'number_format()' function :".number_format($n,2);
?>

Output:

Your number is:1000000
By using 'number_format()' function :1,000,000.00

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