php - Codeigniter user_model Invalid argument supplied for foreach() -

i have problem user_model.php, below it's errors:

a php error encountered severity: warning

message: invalid argument supplied foreach()

filename: models/user_model.php

line number: 18

backtrace:

file: \httpdocs\application\models\user_model.php line: 18 function: _error_handler

file: \httpdocs\application\controllers\user.php line: 9 function: check_role

file: \httpdocs\index.php line: 292 function: require_once

user_model.php

public function check_role() {     $user_id = $this->session->userdata('admin_user_id');     // roles     if ($user_id) {         $row = $this->db->get_where(tbl_users, array('id' => $user_id))->row();         $roles = $this->db->get_where(tbl_roles, array('id' => $row->role_id))->row_array();         foreach ($roles $key => $value) {             $this->session->set_userdata($key, $value);         }     } } 

what wrong foreach?

try check count($roles) before foreach().

public function check_role() {     $user_id = $this->session->userdata('admin_user_id');     // roles     if ($user_id) {         $row = $this->db->get_where(tbl_users, array('id' => $user_id))->row();         $roles = $this->db->get_where(tbl_roles, array('id' => $row->role_id))->row_array();         if(count($roles)>0)         {             foreach ($roles $key => $value) {                $this->session->set_userdata($key, $value);             }         }     } }