How to check is user login or not in codeigniter?

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$this->load->library('session');

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if ($this->session->userdata('logged_in')) {
    // User is logged in
    // Add your code for logged in user here
} else {
    // User is not logged in
    // Add your code for guest users here
}

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function is_user_logged_in(){
   $CI = &get_instance();
   $CI->load->library('session');
   
   if ($CI->session->userdata('logged_in')) {
       return true;
   } else {
       return false;
   }
}

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if (is_user_logged_in()) {
    // User is logged in
    // Add your code for logged in user here
} else {
    // User is not logged in
    // Add your code for guest users here
}