PHP Manual: Multiply numbers

GMP gmp_mul(GMPintstring $num1, GMPintstring $num2)

Multiplies num1 by num2 and returns the result.

num1

A number that will be multiplied by num2.

A GMP object, an int or a numeric string.

num2

A number that will be multiplied by num1.

A GMP object, an int or a numeric string.

A GMP object.

Example #1 gmp_mul example

<?php
$mul = gmp_mul("12345678", "2000");
echo gmp_strval($mul) . "\n";
?>

The above example will output:

24691356000