Get Multiple Bookings Checkout Form Fields

/**
 * Get multiple bookings checkout pages booking form fields using placeholder #_BOOKINGFORMCUSTOM{field_id}
 */
if ( is_admin() )add_filter('em_booking_output_placeholder','my_bookings_placeholder',1,3);
function my_bookings_placeholder($replace, $EM_Booking, $full_result){
	global $wpdb;

	$main_booking_id= $wpdb->get_var($wpdb->prepare('SELECT booking_main_id FROM '.EM_BOOKINGS_RELATIONSHIPS_TABLE.' WHERE booking_id=%d', $EM_Booking->booking_id));
	$booking_meta	= $wpdb->get_var($wpdb->prepare('SELECT booking_meta FROM '.EM_BOOKINGS_TABLE.' WHERE booking_id=%d', $main_booking_id));
	$booking_meta	= unserialize($booking_meta);

	$replace = '';

	foreach($booking_meta['booking'] as $key => $value){
		if ( '#_BOOKINGFORMCUSTOM{'.$key.'}' == $full_result){
				$replace = $booking_meta['booking'][$key];
				break;
		}
	}

	foreach($booking_meta['registration'] as $key => $value){
		if ( '#_BOOKINGFORMCUSTOM{'.$key.'}' == $full_result){
				$replace = $booking_meta['booking'][$key];
				break;
		}
	}

	return $replace;
}