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# PHP | stats_stat_factorial() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP stats_stat_factorial() function.

The built-in stats_stat_factorial() function in PHP returns the factorial of an integer.

## Syntax

Following below is the syntax to use this function -

`float stats_stat_factorial( int \$n )`

## Parameter Details

Sr.NoParameterDescription
1

n

An integer

## Return Value

This PHP function returns the factorial of an integer, n.

## Dependencies

This built-in function was first introduced in statistics extension (PHP version 4.0.0 and PEAR v1.4.0). In this tutorial guide, we used the latest release of stats-2.0.3 (PHP v7.0.0 or newer and PEAR version 1.4.0 or newer).

### Example1

In the below example, we have compute the factorial of an integer 0 -

```<?php
var_dump(stats_stat_factorial(0));
?>```

#### Output

When the above code is executed, it will produce the following result -

`float(1)`

### Example2

In the below example, we have compute the factorial of an integer 1 -

```<?php
var_dump(stats_stat_factorial(1));
?>```

#### Output

When the above code is executed, it will produce the following result -

`float(1)`

### Example3

In the below example, we have compute the factorial of an integer 2 -

```<?php
var_dump(stats_stat_factorial(2));
?>```

#### Output

When the above code is executed, it will produce the following result -

`float(2)`

### Example4

In the below example, we have compute the factorial of an integer 3 -

```<?php
var_dump(stats_stat_factorial(3));
?>```

#### Output

When the above code is executed, it will produce the following result -

`float(6)`

### Example5

The following is an error case. In the below example, we passed an empty parameter. A warning is shown in logs -

```<?php
// error cases
var_dump(stats_stat_factorial());
?>```

#### Output

The above code will produce the following result and a warning in logs PHP Warning: stats_stat_factorial(): expects exactly 1 parameter, 0 given

`bool(false)`

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we will be studying about the PHP stats_stat_independent_t() Function.

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