无法将$ _SESSION中的用户名回显到页面

Question

public function user_login()
{
    $email = $_POST['email'];
    $password = $_POST['password'];
    $userdata = $this->em->user_login($email, $password);
    $user_info = $this->em->does_user_exist($email, $password);
    if ($user_info->num_rows() == 1) {
        foreach ($user_info->result() as $row) {
            $data = array(    
                'id' => $row->id,      
                'username' => $row->username,
                'email' => $row->email,    
                'user_type' => $row->user_type,    
                'logged_in' => TRUE
            );
            $this->session->set_userdata($data);
        }
        if($userdata) {
            echo 1;
        } else {
            echo 'error';
        }
    }
}

This is my controller where I check if user can login and does user exist if they exist I get the all of the data and set the session. For some reason when I echo the the session username it wont display. What could be wrong?

Here's how I echo the session:

<div>
  hello<p><?php echo $this->session->userdata('username'); ?></p>
</div>

<div>
  <p><?php echo $data['username']; ?></p>
</div>

Is there any other way to echo a session?

Answer 1

1st : As per your comment you can return the usename as a response to ajax

        if($userdata) {
           echo json_encode(array('success'=>1,'username'=>$this->session->u‌​serdata('username'))‌​);
        } else {
           echo json_encode(array('success'=>0)‌​);
        }

2nd : And update the DOM in ajax success like this .

  success:function(response){

            if(response.success==1){
             $('#div_id').html(response.username);
           }else{
              $('#div_id').html('error');
           }
    }

3rd : And In your ajax dataType should be json

dataType:'json'