gmp_add
(PHP 4 >= 4.0.4, PHP 5)
gmp_add — Add numbers
Description
   resource gmp_add
   ( resource $a
  , resource $b
   )
  Add two numbers.
Parameters
- a
- 
      A number that will be added. It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number. 
- b
- 
      A number that will be added. It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number. 
Return Values
A GMP number representing the sum of the arguments.
Examples
Example #1 gmp_add() example
<?php
$sum = gmp_add("123456789012345", "76543210987655");
echo gmp_strval($sum) . "\n";
?>
The above example will output:
200000000000000