CodeIgniter updating data using radio button for each row - php

Question

i want to update data using radio button for each row of my data.
Example:
My table
id | name | age | number | account | note | place | radio
after i click the radio button (Mencurigakan/Tidak Mencurigakan), the radio will be updated. I tried using this code and i cannot read my id column and i only can update one row
Controller:
public function updateradio($id) {
$data=$this->welcome_model;
$data->radio=$this->input->post("radio$id");
$data->update_bb($id);
}
Model:
public function update_bb($id) {
$id = /*i need something here*/
$data = array('radio' => $this->input->post("radio$id"));
$this->db->where('id', $id);
$this->db->update('info', $data);
}
View:
<?php
foreach ($results as $row) {
echo '<tr>';
echo '<td>' . $row->id . '</td>';
echo '<td>' . $row->name . '</td>';
echo '<td>' . $row->age . '</td>';
echo '<td>' . $row->number . '</td>';
echo '<td>' . "Rp " . $row->account . '</td>';
echo '<td>' . $row->note . '</td>';
echo '<td>' . $row->place . '</td>';
?>
<form action="<?php echo base_url(); ?>welcome/updateradio" method="post">
<div class="radio">
<label>
<input type="radio" name="radio<?php echo $row->id ?>" value="3"/>
Mencurigakan
</label>
</div>
<div class="radio">
<label>
<input type="radio" name="radio<?php echo $row->id ?>" value="2"/>
Tidak Mencurigakan
</label>
</div>
</td>
<?php
echo '</tr>';
}
?>
<button type="submit" class="btn btn-group">Update</button>
</form>
Any help would be appreciated!