Ticket spaces bookings table column

<?php
/*
 This snippet will add a custom column to the bookings table, which shows the number of ticket spaces booked when viewing a booking table with the scope of a single ticket type.

 For help with adding this for your site, see here - http://wp-events-plugin.com/tutorials/how-to-safely-add-php-code-to-wordpress/
 */

/**
 * Adds columns in the bookings tables
 * @param array $template
 * @return string
 */
function my_em_bookings_table_cols_template_ticket_spaces($template){
    $template['ticket_spaces'] = 'Ticket Spaces';
    return $template;
}
add_action('em_bookings_table_cols_template', 'my_em_bookings_table_cols_template_ticket_spaces',10,1);

/**
 * @param string $val
 * @param string $col
 * @param EM_Booking $EM_Booking
 */
function my_em_custom_booking_form_cols_ticket_spaces($val, $EM_Booking){
    global $wpdb;
    $spaces = $EM_Booking->get_spaces();
    if( !empty($_REQUEST['ticket_id']) ){
        foreach( $EM_Booking->get_tickets_bookings() as $EM_Ticket_Booking ){ /* @var $EM_Ticket_Booking EM_Ticket_Booking */
            if( $EM_Ticket_Booking->ticket_id == $_REQUEST['ticket_id'] ){
                $spaces = $EM_Ticket_Booking->get_spaces();
            }
        }
    }
    return absint($spaces);
}
add_filter('em_bookings_table_rows_col_ticket_spaces','my_em_custom_booking_form_cols_ticket_spaces', 10, 3);