private function insert()
 {
     $this->error = false;
     $this->msg = false;
     $this->v = array('_name' => '', '_branch' => '', '_phone' => '');
     if (isset($_POST['client-form']) && $_POST['client-form']) {
         $requires = array('_name', '_branch', '_phone');
         $values = $this->sanitize_fields($_POST, $requires);
         if (!$values) {
             $this->error = 'Preencha todos os campos! ';
         }
     }
     if (isset($values) && $values) {
         $values['_register_date'] = date('Y-m-d');
         $client = new Model_client();
         $result = $client->insert_client($values);
         if (!$result) {
             $this->error = 'Erro ao cadastrar cliente. Tente novamente! ';
             $this->v = array('_name' => $values['_name'], '_branch' => $values['_branch'], '_phone' => $values['_phone']);
         } else {
             $this->clients = $client->get_clients();
             if (!$this->clients) {
                 $this->error = $client->error;
             }
             include_once 'view/view-client.php';
             exit;
         }
     }
     if (isset($client->error)) {
         $this->error .= $client->error;
     }
     include_once "view/client-insert.php";
 }