**`gmp_mul`** is a function in PHP which multiplies two numbers.

# 
## Syntax
```
gmp_mul(GMP|int|string $num1, GMP|int|string $num2): GMP
```

## Parameters

The function takes in two parameters, `num1` and `num2`.

> `num1` and `num2` can be a  ﻿#key# GMP: GNU Multiple Precision Arithmetic Library #key# object, integer, or numeric string.

## Return value

The function returns the product of `num1` and `num2`, which is a number of `GMP` type.

## Code

<?php
$val1 = gmp_mul("12345678", "20");
echo gmp_strval($val1) . "\n";
?>

What is gmp_mul in PHP?

gmp_mul in PHP multiplies two numbers and returns a GMP type number.

What is gmp_mul in PHP?

Syntax

Parameters

Return value

Code

Expected output