public function subscribes($data) {
$this->db->query("INSERT INTO " . DB_PREFIX . "ar_letters(email_user,email_date) values ('".$data['email']."','".date("Y-m-d")."')");
}
public function getTotalCustomersByEmail($data) {
$query = $this->db->query("SELECT email_user FROM " . DB_PREFIX . "ar_letters where email_user='".$data['email']."'");
return $query->row;
}