Events Tickets Pro - Link events to existing ticket product

EvTic_product_ticket_linker.php

/*
 * Add or remove event ids to an existing ticket product
 */
function tribe_link_product_event ( $product_id, $event_id ) {
    if ( !in_array($event_id, get_post_meta( $product_id, '_tribe_wooticket_for_event') ) ) {
        add_post_meta( $product_id, '_tribe_wooticket_for_event', $event_id );
    }
}

function tribe_unlink_product_event ( $product_id, $event_id ) {
    delete_post_meta( $product_id, '_tribe_wooticket_for_event', $event_id );
}

/*
 * Replace start_event_id and end_event_id with respective values
 *  and uncomment function for events imported via csv
 * or add individual lines for each linking: 
 * tribe_link_product_event(<product_id>,<event_id>);
 * for removing rename function to ***_unlink_***
 /*
 
function link_multiple_events_to_tickets() {
  $product_ids = array(); // insert product id 
  $start_event_id = Null; // replace with actual event ids
  $end_event_id = Null;
  for( $add_event_id = $start_event_id; $add_event_id <= $end_event_id; $add_event_id++ ) {
    for( $prod_iter = 0, $products = count($product_ids); $prod_iter < $products; ++$prod_iter ) {
      tribe_link_product_event( $product_ids[$prod_iter], $add_event_id );
    }
  }
}

link_multiple_events_to_tickets(); //comment out when linkages made