PHP不会将会话设置为TRUE

Question

I'm trying to create a login system but it doesn't seem to set "Session=true". Please help I'm stuck with this for too long now.

Session starts Checked all my code No PHP errors and No database Errors

Login Page:

if($session->is_logged_in()) {
  redirect_to("index.php");
}


if (isset($_POST['submit'])) { // Form has been submitted.

  $user_name = trim($_POST['user_name']);
  $password = trim($_POST['password']);

  // Check database to see if username/password exist.
    $found_user = User::authenticate($user_name, $password);

  if ($found_user) {
    $session->login($found_user);
    redirect_to("index.php");
  } else {
    // username/password combo was not found in the database
    $message = "Username/password combination incorrect.";
  }

} else { // Form has not been submitted.
  $user_name = "";
  $password = "";
}

Session Class:

class Session {

    private $logged_in=false;
    public $user_id;

    function __construct() {
        session_start();
        $this->check_login();
    if($this->logged_in) {
      // actions to take right away if user is logged in
    } else {
      // actions to take right away if user is not logged in
    }
    }

  public function is_logged_in() {
    return $this->logged_in;
  }

    public function login($user) {
    // database should find user based on username/password
    if($user){
      $this->user_id = $_SESSION['user_id'] = $user->id;
      $this->logged_in = true;
    }
  }

  public function logout() {
    unset($_SESSION['user_id']);
    unset($this->user_id);
    $this->logged_in = false;
  }

    private function check_login() {
    if(isset($_SESSION['user_id'])) {
      $this->user_id = $_SESSION['user_id'];
      $this->logged_in = true;
    } else {
      unset($this->user_id);
      $this->logged_in = false;
    }
  }

}

$session = new Session();

index page:

if (!$session->is_logged_in()) { redirect_to("login.php");

Authorize Method:

public static function authenticate($user_name="", $password="") {
    global $database;
    $user_name = $database->escape_value($user_name);
    $password = $database->escape_value($password);

     $sql="SELECT * FROM users WHERE user_name='{$user_name}' AND password ='{$password}' LIMIT 1";
    $result_array = self::find_by_sql($sql);
        return !empty($result_array) ? array_shift($result_array) : false;
    }

Answer 1

Change your is_logged_in() function to:

public function is_logged_in() {
  $this->check_login();
  return $this->logged_in;
}

Otherwise is_logged_in() will always return false on each new request (such as redirecting between pages). By calling check_login() first, it will set the logged_in variable with the value (true or false, dependent on if $_SESSION['user_id'] is set.

EDIT:

I'm sorry, I've overlooked the line in the constructor where you already call $this->check_login();

Another thing is that the authenticate function returns an Array instead of an object. So, change the following:

$this->user_id = $_SESSION['user_id'] = $user->id;

To

$this->user_id = $_SESSION['user_id'] = $user['id'];

Answer 2

Finally I have found the solution to this.

Guess what? It wasn't my codes fault but it was my servers(WAMP 2) fault. So, I uninstalled WAMP 2 and updated to the newer version WAMP 2.5. Solved my problem and no more getting redirect to login page!