$result=$this->db->query("SELECT from_user,to_user,type FROM chats WHERE (from_user=$user_id OR to_user=$user_id) AND type IN('0','1')")->result_array();
$result=$this->db->query("SELECT from_user,to_user,type FROM chats WHERE (from_user=$user_id OR to_user=$user_id) AND type IN('0','1')")->result_array();