# Expm1()

Today, we will discuss the `expm1()` function in PHP. This function is used to calculate the exponential value of a number minus 1.

## What is the expm1() Function?

The `expm1()` function in PHP is a built-in function that is used to calculate the exponential value of a number minus 1. The exponential value of a number minus 1 is calculated as e raised to the power of the number provided as input minus 1. The function takes a number as input and returns the exponential value of the number minus 1.

## How to Use the expm1() Function

Using the `expm1()` function in PHP is very simple. Here is an example of how to use the function:

``````<?php
\$number = 2;

// Calculate the exponential value of the number minus 1 using the expm1() function
\$exponential_value_minus_one = expm1(\$number);

// Output the exponential value of the number minus 1
echo \$exponential_value_minus_one;
?>``````

In this example, we set the number as a variable. We then call the `expm1()` function with the number as a parameter to calculate the exponential value of the number minus 1. Finally, we output the exponential value of the number minus 1 to the screen.

## Conclusion

The `expm1()` function in PHP is a useful tool for any PHP developer working with mathematics. By using this function, you can calculate the exponential value of a number minus 1, which can be useful in a variety of applications. We hope that this guide has been helpful in understanding how to use the `expm1()` function in your PHP code.