How to use PHP number_format() function

1. Below code can use for that

<?php
echo number_format("1000000")."<br>";
echo number_format("1000000",2)."<br>";
echo number_format("1000000",2,",",".");
?>

Outputs will be

1,000,000
1,000,000.00
1.000.000,00

Syntax

number_format(number,decimals,decimalpoint,separator)