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How to manage Codeigniter session with Ionic 3 application?

 have developed Codeigniter back-end and I want to use same controllers with Ionic 3 application. Ionic 3 login works perfect with back-end controller and creates session and I store user data in the session variable. When I access another controller via Ionic 3 after login success, it has no any user data in the session. I need to keep session data until it destroy on logout because user data is used in each controller access whether user is logged in or not. Here is my code.
//main login function
function user_login(){

   //Allow Cross origin

   $username = $this->input->post('username');
   $password = MD5($this->input->post('password'));

   $data = array('status'=>false,'message'=>'','data'=>'');

   //check a session exists,if not create new
       $user_data = array(
               'username' => $username,
               'attempts' => 0,
               'logged_in' => false

   $attempts = $this->session->userdata('attempts'); //get number of tried attempts

   $this->session->set_userdata('attempts',($attempts + 1));//increse number of attempts from one

       $lognError = $this->login_model->get_data_from_login_error_table($username);
       $b = true;

       if(sizeof($lognError) > 0){

           $trialsCount = $lognError['trials_count']; //get number of attempts that tried

           if($trialsCount >= 25){

               $b = false;

       if($b == true){

           $is_login = $this->login_model->login($username,$password);

           if($is_login != null) {

               $this->session->set_userdata('loged_in', true);
               $this->session->set_userdata('user_details', $user_details);
           } else {
               $data['status'] = false;
               $data['message'] = 'Incorrect username or password';

   // }
   echo json_encode($data);

//Checking whether user logged or not
public function is_login(){

   $details = $this->session->userdata('username');
   $is_loged_in = $this->session->userdata('loged_in');

   if(!$details || !$is_loged_in) {

$this->session->userdata(‘username’); returns null when I access via Ionic 3 but works fine with browser. How can I use PHP backend with ionic 3?
Help me out to solve this problem. Thanks in advanced.

What you describe is usually due to improper session and/or cookie config settings. Show the associated $config values and maybe someone will spot a problem.

Things to check, how is it loading pages, looks all ajax one page, check cors, are you acquiring js from a cdnjs site, if so this might be causing issues.
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