Retrieves the customer's memberships ("active" or "cancelled" status) and returns the ID numbers of the associated membership levels.
- $customer_id (int) - ID of the customer to check. Uses currently logged in customer if omitted.
array- Array of membership level IDs.
Checks to see if the current customer is on the membership level #2:
<?php if( in_array( 2, rcp_get_customer_membership_level_ids() ) ) : ?> <p>Content inside here would only be visible to active members with a membership level ID of 2.</p> <?php endif; ?>