Add BCC notifications based on check boxes

// http://www.gravityhelp.com/forums/topic/help-with-conditional-routing
// change the 53 here to your form ID
add_filter('gform_pre_submission_filter_53', 'add_bcc');
function add_bcc($form){

    // the array indexes here are the values of the input select boxes.  View source of the form to see the actual IDs
    $addresses = array(
        1 => '[email protected],[email protected]',
        2 => '[email protected],[email protected]',
        3 => '[email protected],[email protected]',
        4 => '[email protected],[email protected]',
        5 => '[email protected],[email protected]',
        6 => '[email protected],[email protected]',
        7 => '[email protected],[email protected]',
        8 => '[email protected],[email protected]',
        9 => '[email protected],[email protected]',
        11 => '[email protected],[email protected]',
        12 => '[email protected],[email protected]',
        13 => '[email protected],[email protected]',
        14 => '[email protected],[email protected]',
        15 => '[email protected],[email protected]',
        16 => '[email protected],[email protected]',
        17 => '[email protected],[email protected]',
        18 => '[email protected],[email protected]',
        19 => '[email protected],[email protected]',
        21 => '[email protected],[email protected]',
        22 => '[email protected],[email protected]',
        22 => '[email protected],[email protected]',
        24 => '[email protected],[email protected]',
        24 => '[email protected],[email protected]',
        25 => '[email protected],[email protected]',
        26 => '[email protected],[email protected]',
        27 => '[email protected],[email protected]',
        28 => '[email protected],[email protected]',
        29 => '[email protected],[email protected]',
        31 => '[email protected],[email protected]',
        32 => '[email protected],[email protected]'
    );

    // my form uses input_1 for the select box.  Your form may be different.  Change it here is necessary
    $input_prefix = 'input_1_';

    // clear out any BCC notifications from the form builder
    $bcc = '';

    // loop through 30 fields to see if we need to send more notifications
    for ($i=1; $i<=30; $i++) {

        // be careful: Gravity Forms avoids numbering inputs with numbers ending in zero
        $input_field = $input_prefix . $i;

        // Check the form submission for the select box. If there is a value in $input_field, then add the addresses for that selection to the bcc list
        // rgpost is a safe way of accessing the $_POST values
        if (rgpost($input_field)) {
            $bcc .= $addresses[$i] . ','; // we'll strip off this last comma later
        }
    }

    // remove the trailing comma is there is one
    $form['notification']['bcc'] = rtrim($bcc, ',');

    // return the modified form object
    return $form;
}