How can PHP functions be structured to improve code readability and maintainability?

PHP functions can be structured to improve code readability and maintainability by following best practices such as using descriptive function names, keeping functions short and focused on a single task, and utilizing comments to explain the purpose of the function and its parameters. Additionally, organizing functions logically within the codebase can make it easier to navigate and understand the functionality of the application.

// Example of a well-structured PHP function
function calculateTotalPrice($price, $quantity) {
    // Calculate the total price
    $totalPrice = $price * $quantity;
    
    // Return the total price
    return $totalPrice;
}