**`gmp_fact`** is a function in PHP that calculates the factorial of the argument passed.


# 
## Syntax
```
gmp_fact(GMP|int|string $num): GMP
```

## Parameters

The function takes in one parameter, `num`.

> `num` can be a numeric `string`, ﻿#key# GMP: GNU Multiple Precision Arithmetic Library #key# object, or an `int` type value.

## Return value

The function returns the factorial of `num`.  The value returned is a `GMP` type number.
## Code

<?php
$val1 = gmp_fact(4);
echo gmp_strval($fact1) . "\n";
?>

What is gmp_fact in PHP?

Syntax

Parameters

Return value

Code

Expected output