# PHP | stats_dens_pmf_poisson() Function

March 26, 2021

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_dens_pmf_poisson() Function.

The built-in PHP

The built-in PHP

*stats_dens_pmf_poisson()*function is a Probability Mass Function of the poisson distribution.## Syntax

Following below is the syntax to use this function -

float stats_dens_pmf_poisson( float $x, float $lb )

## Parameter Details

Sr.No | Parameter | Description |
---|---|---|

1 |
| The value at which the probability mass is calculated. |

2 | lb | The parameter of the poisson distribution |

## Return Value

This function returns the probability mass at x, where the random variable follows the Poisson distribution whose parameter is lb or

*false*on failure.## 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

The following example below computes the probability mass at each x -

<?php // check for each x foreach (range(0, 5) as $x) { var_dump(round(stats_dens_pmf_poisson($x, 1), 6)); echo "<br>"; } ?>

#### Output

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

float(0.367879) float(0.367879) float(0.18394) float(0.061313) float(0.015328) float(0.003066)

### Example2

The following example below computes the probability mass for each lb -

<?php // check for each lb foreach (range(0.5, 3, 0.5) as $lb) { var_dump(round(stats_dens_pmf_poisson(1, $lb), 6)); echo "<br>"; } ?>

#### Output

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

float(0.303265) float(0.367879) float(0.334695) float(0.270671) float(0.205212) float(0.149361)

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

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*stats_dens_t()*Function.Feel free to ask your questions where necessary and we will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

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