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PHP | stats_rand_gen_normal() 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_rand_gen_normal() function.

The PHP stats_rand_gen_normal() Function generates a single random deviate from the normal distribution.

Syntax

Following below is the syntax to use this function -

`float stats_rand_gen_normal( float \$av, float \$sd )`

Parameter Details

Sr.NoParameterDescription
1

av

The mean of the normal distribution

2

sd

The standard deviation of the normal distribution

Return Value

This built-in PHP function returns a random deviate from the normal distribution with av as the mean of the normal distribution and sd as the standard deviation of the normal distribution.

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

Below example generates a random deviate from the normal distribution with mean set to 0, and standard deviation set to 1 -

```<?php
var_dump(is_float(stats_rand_gen_normal(0, 1)));
?>```

Output

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

`bool(true)`

Example2

Below example generates a random deviate from the normal distribution with mean set to 0, and standard deviation set to 0 -

```<?php
var_dump(stats_rand_gen_normal(0, 0));
?>```

Output

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

`float(0)`

Example3

Following is an error case. In the following example below, we have passed sd < 0. A warning is shown in logs -

```<?php
// error cases
var_dump(stats_rand_gen_normal(0, -0.1)); // sd < 0
?>```

Output

The above code will produce the following result and a warning in logs PHP Warning: stats_rand_gen_normal(): sd < 0.0. sd: -1.000000E-1

`bool(false)`

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

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