how to get the value of form input box in codeigniter

Based on your comment to my first answer, here is a sample of a Controller, Model and View to update a user entry pulled from a table in a database.

Controller

class Users extends Controller{    function Users()    {        parent::Controller();    }    function browse()    {    }    function edit($id)    {        // Fetch user by id        $user = $this->user_model->get_user($id);        // Form validation        $this->load->library('form_validation');        $this->form_validation->set_rules('name', 'Name', 'required');        if ($this->form_validation->run())        {            // Update user            $user['name'] = $this->input->post('name', true);            $this->user_model->update_user($user);            // Redirect to some other page            redirect('users/browse');        }        else        {            // Load edit view            $this->load->view('users/edit', array('user' => $user));        }    }        }

Model

class User_model extends Model{    function User_model()    {        parent::Model();    }    function get_user($user_id)    {        $sql = 'select * from users where user_id=?';        $query = $this->db->query($sql, array($user_id));        return $query->row();    }    function update_user($user)    {        $this->db->where(array('user_id' => $user['user_id']));        $this->db->update('users', $user);    }}

View

<?php echo form_open('users/edit/' . $user['user_id']); ?><div>    <label for="name">Name:</label>    <input type="text" name="name" value="<?php echo set_value('name', $user['name']); ?>" /></div><div>    <input type="submit" value="Update" /></div><?php echo form_close(); ?>

It's hard to see the problem from your snippets of code, please try and give a little more information as to the structure of your app and where these code samples are placed.

Presume in the last code listing ('somewhere in index') you are getting $id from the form, but you define the ID of the form input box as 'id' array('name'=>'fname','id'=>'id') rather than an integer value so maybe this is where the problem lies.

Where does the $data array get passed to in the third code listing?

From your question I think you want to display a form to edit a person record in the database.

Controller code

// Normally data object is retrieved from the database// This is just to simplify the code$person = array('id' => 1, 'name' => 'stephenc');// Pass to the view$this->load->view('my_view_name', array('person' => $person));

View code

<?php echo form_label('Your name: ', 'name'); ?><?php echo form_input(array('name' => 'name', 'value' => $person['name'])); ?>

Don't forget to echo what is returned from form_label and form_input. This could be where you are going wrong.