PHP | gmp_add() for adding large numbers

The gmp_add() is a built-in function in PHP which is used to add two GMP numbers (GNU Multiple Precision : For large numbers).

Syntax :

gmp_add ( $num1, $num2 )

Parameters: This function accepts two GMP numbers as mandatory parameters as shown in the above syntax. These can be a GMP object in PHP version 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number. This function adds these two numbers and returns it.

Return Value: This function returns a GMP number which is sum of the two numbers passed as parameter.

Examples:

Input : "123456789", "987654321"
Output : 1111111110

Input : "5628179032615", "7136454221086"
Output : 12764633253701

Below programs illustrate the gmp_add() function in PHP :

Program 1 :

<?php
$sum = gmp_add("5628179032615", "7136454221086");
echo gmp_strval($sum);

?>
</div>

Output:

12764633253701

Program 2:

<?php

$sum = gmp_add("123456789", "987654321");

echo gmp_strval($sum);

?>

Output:

1111111110

Reference:
http://php.net/manual/en/function.gmp-add.php