如何将数据从模型传递到视图（或控制器）

Question

The question is simple: How can i pass data from model to view(or back to the controller) to display errors like "your password is too short"

Here is the controller

class UsersController extends Controller {

    private $username;
    private $password;

    function register()
    {
        if($_POST)
        {
            $this->User->username = $_POST['username'];
            $this->User->password = $_POST['password'];
            $this->User->register();
        }
    }



}

the model

class User extends Model {

    public $username;
    public $password;

    function register()
    {
        $username = $this->username;
        $password = $this->password;

        if (!empty($username) && !empty($password))
        {
            // registration process
        }
        else
        {
            // "you must provide a username and password" or something like that
        }
    }

Answer 1

Just have your register function in your model return "PASSWORD"; to the controller and have your controller take the return from the model and return it to the view. Let the view interpret what the error output for "PASSWORD" is.

Example:

the controller

class UsersController extends Controller {

    private $username;
    private $password;

    function register()
    {
        if($_POST)
        {
            $this->User->username = $_POST['username'];
            $this->User->password = $_POST['password'];
            return $this->User->register();
        }
    }
}

the model

class User extends Model {

    public $username;
    public $password;

    function register()
    {
        $username = $this->username;
        $password = $this->password;

        if (!empty($username) && !empty($password))
        {
            // ...
            return "SUCCESS";
        }
        else
        {
            return "PASSWORD";
        }
    }
}

the view

$responses = array("SUCCESS" => "Registered Successfully!", "PASSWORD" => "You must provide a username and password!");

$result = $this->UsersController->register();
echo $responses[$result];