number_format: the second parameter indicates the number of decimals after the decimal point

 
<?php

$i = 123456;
$f = 98765.567;

$si = number_format($i, 0, ',', '.');
$sf = number_format($f, 2);

echo "\$si = $si and \$sf = $sf\n";
?>

1.	Format an integer and a floating-point value with the number_format() function.
2.	Formatting Numbers As Text
3.	number_format for English format and Italian format
4.	number_format($n, $p, $t, $d) rounds $n to $p decimal places, using $t as the thousands separator and $d as the decimal separator.
5.	number_format($n,$p) rounds $n to $p decimal places, adding commas between thousands
6.	number_format() enables us to determine the precision we require using a second argument: an integer.
7.	Printing a formatted number

number_format: the second parameter indicates the number of decimals after the decimal point : number_format « Data Type « PHP