Featured Images of the Current User’s All Active Memberships

/**

 * Display featured images of the current user's active memberships

 * Add the [membership_thumbnail] shortcode to display the featured images of all active memberships of the current user.

 */

function custom_membership_thumbnail_shortcode() {

    if ( !is_user_logged_in() ) return;

    $user = MeprUtils::get_currentuserinfo();

    $memberships = $user->active_product_subscriptions( 'ids' );

    $output = '';

    if ( empty($memberships) ) return;

    foreach ( $memberships as $membership ) {

        if ( has_post_thumbnail( $membership ) ) {

            $thumbnail_url = get_the_post_thumbnail_url( $membership, 'thumbnail' );

            $output .= "<img src='" . esc_url( $thumbnail_url ) . "' class='membership-thumbnail' width='400' height='400' style='margin: 10px;'>";

        }

        return $output;

    }

    return '';

}

add_shortcode( 'membership_thumbnail', 'custom_membership_thumbnail_shortcode' );