Integral that the value be displayed as a dollar amount set to two decimal places:

 
<?php
  $thenumber = 9.99 * 1.07;

  echo "$" . $thenumber . "<br />"; 

  echo "$" . sprintf ("%.2f", $thenumber); 
?>

1.	Using a sprintf()-style message catalog
2.	Using sprintf with a variable
3.	Using sprintf() to ensure that one digit hex numbers (like 0) get padded with a leading 0.
4.	sprintf print values to a string
5.	sprintf()'s built-in hex-to-decimal conversion with the %x format character
6.	integer displayed as a dollar amount set to two decimal places
7.	Storing a Formatted String
8.	Wrap these in a couple of functions and surround the joined array elements with parentheses

Integral that the value be displayed as a dollar amount set to two decimal places: : sprintf « String « PHP