Shifting of billing fields to shipping tab

Hi!

I want to keep the First name and Last name fields in Billing tab and move all other to shipping tab. I can do this with following code in functions.php. However I get internal server error when trying to checkout. Any help would be highly appreciated.

function billing_fields_another_group( $checkout_fields ){

// 1. We assign a field array to another group here
$checkout_fields[ ‘order’ ][ ‘billing_company’ ] = $checkout_fields[ ‘billing’ ][ ‘billing_company’ ];

$checkout_fields[ ‘order’ ][ ‘billing_country’ ] = $checkout_fields[ ‘billing’ ][ ‘billing_country’ ];

$checkout_fields[ ‘order’ ][ ‘billing_address_1’ ] = $checkout_fields[ ‘billing’ ][ ‘billing_address_1’ ];

$checkout_fields[ ‘order’ ][ ‘billing_address_2’ ] = $checkout_fields[ ‘billing’ ][ ‘billing_address_2’ ];

$checkout_fields[ ‘order’ ][ ‘billing_city’ ] = $checkout_fields[ ‘billing’ ][ ‘billing_city’ ];

$checkout_fields[ ‘order’ ][ ‘billing_state’ ] = $checkout_fields[ ‘billing’ ][ ‘billing_state’ ];

$checkout_fields[ ‘order’ ][ ‘billing_postcode’ ] = $checkout_fields[ ‘billing’ ][ ‘billing_postcode’ ];

$checkout_fields[ ‘order’ ][ ‘billing_phone’ ] = $checkout_fields[ ‘billing’ ][ ‘billing_phone’ ];

// 2. Remove a field from a previous location
unset( $checkout_fields[ ‘billing’ ][ ‘billing_company’ ] );
unset( $checkout_fields[ ‘billing’ ][ ‘billing_country’ ] );
unset( $checkout_fields[ ‘billing’ ][ ‘billing_address_1’ ] );
unset( $checkout_fields[ ‘billing’ ][ ‘billing_address_2’ ] );
unset( $checkout_fields[ ‘billing’ ][ ‘billing_city’ ] );
unset( $checkout_fields[ ‘billing’ ][ ‘billing_state’ ] );
unset( $checkout_fields[ ‘billing’ ][ ‘billing_postcode’ ] );
unset( $checkout_fields[ ‘billing’ ][ ‘billing_phone’ ] );

return $checkout_fields;

}

Regards,
J.