Message and confirmation of the Codeigniter form

I am not a professional, but I know my way around PHP, I am new to Codeigniter.

Looking through these guides: http://net.tutsplus.com/articles/news/codeigniter-from-scratch-day-5-crud/

OK, so I have a page that lists users, clicking on the username will go to the edit page, the URL of this page is index.php / users / edit / 1 (where 1 is the user ID)

There is a form on the editing page, this form contains several parts, each part is filled from different tables in the database. Therefore, my controller for editing looks like this:

function edit() {

        //load model
        $this->load->model('users_model');

        //assign user data from DB 
        $data['data_user'] = $this->users_model->getUser($this->uri->segment(3));
        //get users Password, using username from above
        $data['data_user_password']= $this->users_model->getUserPassword($data['data_user'][0]->UserName);

        $data['page_content'] = 'pages/users_edit';
        $this->load->view('template/template', $data);
    }

: $data['data_user'] , , , $data['data_user_password']

, user_edit.php, . , :

if (is_array($data_user)) {
    foreach($data_user as $user) 
    {
        $userID         = $user->id;
        $userName       = $user->Name;
        $userUserName   = $user->UserName;
        $userMail       = $user->Mail;
        $userDepartment = $user->Department;
        $userWorkPhone  = $user->WorkPhone;
        $userHomePhone  = $user->HomePhone;
        $userMobile     = $user->Mobile;

    }
}
//user password
if (is_array($data_user_password)) {
    foreach($data_user_password as $user) 
    {
        $userPassword   = $user->value;
    }
}

Name: 
<?php echo form_input('name', set_value('name', $userName), 'id="name" class="inputLong"'); ?>

, : index.php/users/update

:

function update() {

        echo '<pre>';
        print_r($_POST);
        echo '</pre>';
        //exit();

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

        $this->form_validation->set_rules('name', 'Name', 'trim|required');

        if ($this->form_validation->run() == FALSE)
        {
            $this->load->view('pages/users_edit');
        }
        else
        {
            $this->index();
        }

    }

, form input = name id = name

, if ($ this- > form_validation- > run() == FALSE), , , , , - . , , post $, edit().

, validation_errors, :

Name .

, , , , PHP:

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: userUserName

Filename: pages/users_edit.php

Line Number: 50