How can the EVA principle be applied to improve the readability and maintainability of PHP code, as suggested in the forum thread?

Issue: The EVA principle (Easily Valuable and Accessible) can be applied to improve the readability and maintainability of PHP code by ensuring that code is well-structured, well-documented, and easy to understand. Fix:

/**
 * This function calculates the sum of two numbers.
 *
 * @param int $num1 The first number
 * @param int $num2 The second number
 * @return int The sum of the two numbers
 */
function calculateSum($num1, $num2) {
    return $num1 + $num2;
}