how to add commas to numbers in php without number_format code example

Example: format money with commas in php

<?php
function CurrencyFormat($number)
{
   $decimalplaces = 2;
   $decimalcharacter = '.';
   $thousandseparater = ',';
   return number_format($number,$decimalplaces,$decimalcharacter,$thousandseparater);
}
?>