What is the best practice for defining constants in PHP scripts?

Defining constants in PHP scripts is a common practice to store values that should not change throughout the script execution. The best practice for defining constants in PHP is to use the `define()` function, which ensures that the constant value cannot be changed or redefined later in the script. Constants should be named using all uppercase letters with underscores separating words for readability. 

// Define a constant named PI with a value of 3.14
define('PI', 3.14);

// Example of using the constant in a script
$radius = 5;
$area = PI * $radius * $radius;
echo "The area of the circle is: $area";

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