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PHP program to create a constant using define() function

Here, we are going to learn how to create a constant using define() function in PHP?
Submitted by Nidhi, on November 11, 2020 [Last updated : March 13, 2023]

Creating a Constant in PHP

Here, we will create a PI constant using the define() function and calculate the area of the circle.

PHP code to create a constant using define() function

The source code to create a constant using the define() function is given below. The given program is compiled and executed successfully.

<?php
//PHP program to create a constant
//using define() function.

define(PI, 3.14);

$radius = 5;

$area = PI * $radius * $radius;

print ("Area of circle: " . $area);
?>

Output

Area of circle: 78.5

Explanation

In the above program, we created a constant PI using the define() function that contains value 3.14. Then we created a local variable $radius initialized with 5. Then calculate the area of the circle and print the result on the console screen.

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