For ITSE 2402 students, here is an example in php:
http://www.plus2net.com/php_tutorial/php_math_number_format.php

  A student wrote this test example:


  I just copied the formatting of 

  .number_format($variable,3,"#",",);

  as listed on that site in the 3rd example listed. 

 echo "

 The value after formating = ".number_format($number,3,"#",":");
// Will display 2:512:589#668
( with : after each thousand and # as decimal symbol )

The 3 is the amount of digits to put the , after and I 
changed the # to a . for the decimal and the : to a comma. 
So in the listed example, where they have a colon, I have a 
comma and where they have a #, I have a decimal.