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PHP | gmp_add() for adding large numbers

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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

Last Updated : 13 Apr, 2018
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