How can PHP code be structured to separate data validation, presentation, and logic for better readability and maintainability?

To separate data validation, presentation, and logic in PHP code for better readability and maintainability, you can utilize the MVC (Model-View-Controller) design pattern. This involves dividing your code into separate folders or classes for models (data handling), views (presentation), and controllers (logic). By doing this, you can easily identify and modify different aspects of your code without affecting the others. 

// Model (data validation)
class User {
    public function validateData($data) {
        // Validation logic here
    }
}

// View (presentation)
class UserView {
    public function displayUser($user) {
        // Presentation logic here
    }
}

// Controller (logic)
class UserController {
    public function createUser($data) {
        $user = new User();
        $isValid = $user->validateData($data);
        
        if($isValid) {
            $userView = new UserView();
            $userView->displayUser($data);
        } else {
            echo "Invalid data!";
        }
    }
}

$userController = new UserController();
$userController->createUser($_POST);

Keywords

data validation presentation logic separation readability maintainability

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