How important is code readability and maintainability when deciding between separate functions and if() statements in PHP?

Code readability and maintainability are crucial factors when deciding between separate functions and if() statements in PHP. Using separate functions can make the code more modular, easier to understand, and simpler to maintain in the long run. On the other hand, using if() statements can lead to complex and hard-to-follow code, especially as the logic grows more intricate.

// Using separate functions for better readability and maintainability
function calculateSquare($num) {
    return $num * $num;
}

function calculateCube($num) {
    return $num * $num * $num;
}

// Calling the functions
echo calculateSquare(2); // Output: 4
echo calculateCube(2); // Output: 8