CodeIgniter: Getting data from form array into post array

Question

I'm racking my brain. I'm using CodeIgniter, trying to get a value from a form checkbox into a data array to send off to the database. Here are the snippets:

Form (view):

<label>Rental Car?</label><input type="checkbox" name="options[is_rental]" value="1" <?php echo set_checkbox('options[is_rental]', '1', FALSE); ?> />

Controller:

$data['is_rental'] = $this->input->post('options[is_rental]');

Now, during this process I'm also validating and re-populating the form with data using options[is_rental] and that works just fine. Using var_dump I get:

Dumps (with the checkbox checked) from the controller:

var_dump($this->input->post('options[is_rental]'))

Returns

bool(false)

and...

var_dump($this->input->post('options'))

Returns

array(3) { ["engine"]=> string(4) "4cyl" ["transmission"]=> string(9) "automatic" ["is_rental"]=> string(1) "1" }

For what it's worth, I can't get to those other values in the array either.

Solution

Why not just do:

$data = $this->input->post('options');

Then $data['is_rental'] should == 1