Codeigniter how to get userid after login

Best practice would be that when you check the login details in your model after success you should create a session saving userid of that user and use that anywhere in your application for fetching respective data against that user. Take a look at following psuedo code for login user.

    public function userAuthentication($username,$pass){$this->db->select('id');$this->db->where('username',$username);$this->db->where('password',md5($pass));$result = $this->db->get('users')->result();if(!empty($result)){   $this->session->set_userdata('userlogged_in', $result[0]->id);  return true;}else{  return false;}}

You can place this function in your model and apply it in your controller. I hope this helps.

As good coder create session at login time and use session at website wide.

public function login($username, $password) {    $user = $this->db        ->select("username, name, phone")        ->where(             [                'username' => $username,                'password' => md5($password)             ]         )        ->get("table_name")        ->row();   if ($user) {         $logindata = [             'userid' => $user->username,             'name'   => $user->name,             'phone'  => $user->phone         ];         $this->session              ->set_userdata($logindata);         return true;   }   else {         return false;   }} 

Then after you can use anywhere in website

echo $this->session->userid;

I hope it will help you in general way.

You may create a session and set user id after successful login.