why isn't this unsetting?

[sabret00the]

alternatively for anyone else baffled by this in the future (probably me).

PHP Code:

        $tagtodelete = urldecode($_POST['tagdelete']);

        $formdetails['taglist'] = explode(',', $formdetails['taglist']);

        unset($formdetails['taglist'][array_search($tagtodelete, $formdetails['taglist'])]);
        $formdetails['taglist'] = implode(',', array_values($formdetails['taglist']));