会话不工作PHP

Question

The session is not getting created and keep getting redirected to login.php. Really don't understand why! I really need help :(

Here is my 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($user) {
    if($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();

?>

Here is a part of my Login page:

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 = "";
}

And here is a part of the index.php:

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

What I have tried:

I tried putting a session_start(); at the start no luck. Looked for errors in all the code used in these pages.

Answer 1

Call the session_start(); before the if statement in the login page.