$selected attribute not working in codeigniters form_dropdown() - forms

Question

I have an editform with a dropdown for choosing a category.
I also made a function for getting the category from the database.
I set an array $opties for the dropdown to select form and a 'selected' parameter called $selectie this one contains the category for that specific company in the database.
It looks like this:
<tr>
<td><?= form_label('Categorieen'); ?></td>
<td><?= form_dropdown('categorieen', $opties, $selectie); ?></td>
</tr>
Question
Why is my 'selected' part not working?
When I do a print_r($selectie) I get:
Array
(
[12] => Vlaggen
)
which is my category in the database.
When I do a print_r($opties) I get:
Array
(
[11] => Webdesign
[12] => Vlaggen
[13] => Auto-s
[14] => Electronica
[15] => Boeken
[16] => Antiek-en-Kunst
[17] => Auto-Onderdelen
[18] => Computers-Hardware
[19] => Computers-Software
)
I don't know what the problem is.
Some help would be appreciated.
Controller:
function updatebedrijven()
{
$dbres = $this->db->get('categorieen');
$ddmenu = array();
foreach ($dbres->result_array() as $tablerow) {
$ddmenu[$tablerow['idcategorieen']] = $tablerow['Categorie'];
}
$data['opties'] = $ddmenu;
$id = $this->uri->segment(3);
$id2 = $this->uri->segment(3);
$data['selected'] = $this->members_model->getselection($id2);
$data['info'] = $this->members_model->getbedrijf($id);
$data['id'] = $id;
$this->load->view('members/header');
$this->load->view('members/editform', $data);
$this->load->view('members/footer');
}
Model:
//This one is for the $opties
function getbedrijf($id)
{
$this->db->where('idbedrijven', $id);
$query = $this->db->get('bedrijven');
if ($query->num_rows() == 1) {
$row = $query->row_array(0);
return $row;
}
}
//This one is for the $selectie
function getselection($id2)
{
$this->db->from('bedrijfcategorieen');
$this->db->join('categorieen', 'bedrijfcategorieen.idcategorieen = categorieen.idcategorieen');
$this->db->where('bedrijfcategorieen.idbedrijven', $id2);
$query = $this->db->get();
return $query->result();
}

Answer 1

form_dropdown uses the arrays key => value as its 'value' and 'option',
to select a data from your dropdown you will need the key of your selected data for example you choose
[12] => Vlaggen to select it you need its key which is 12, and not an array like
Array
(
[12] => Vlaggen
)
<?
//just for testing
echo form_dropdown('categorieen', $opties, key($selectie));
?>