Today, we will discuss the pi() function in PHP. This function is used to return the value of pi.

What is the pi() Function?

The pi() function in PHP is a built-in function that is used to return the value of pi. The value of pi is a mathematical constant that represents the ratio of the circumference of a circle to its diameter. The value of pi is approximately 3.1415926535898.

How to Use the pi() Function

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

// Get the value of pi using the pi() function
$result = pi();

// Output the result
echo $result;

In this example, we call the pi() function to get the value of pi. We then store the result in a variable and output it to the screen.


The pi() function in PHP is a useful tool for any PHP developer working with mathematics or geometry. By using this function, you can quickly and easily get the value of pi, which can be useful in a variety of applications. We hope that this guide has been helpful in understanding how to use the pi() function in your PHP code.

Practice Your Knowledge

Which of the following statements about the value of PI in PHP are correct?

Quiz Time: Test Your Skills!

Ready to challenge what you've learned? Dive into our interactive quizzes for a deeper understanding and a fun way to reinforce your knowledge.

Do you find this helpful?