bbPress check if is-subscribed

function shmoo_bbp_user_subscribe_check( $args = '', $user_id = 0 ) {
    echo shmoo_bbp_get_user_subscribe_check( $args, $user_id );
}
    function shmoo_bbp_get_user_subscribe_check( $args = '', $user_id = 0 ) {
        if ( ! bbp_is_subscriptions_active() ) {
            return;
        }

        // Parse arguments against default values
        $r = bbp_parse_args( $args, array(
            'subscribe'   => 'nope',
            'unsubscribe' => 'yes',
            'user_id'     => 0,
            'topic_id'    => 0,
            'forum_id'    => 0,
        ), 'get_user_subscribe_link' );

        // Validate user and object ID's
        $user_id  = bbp_get_user_id( $r['user_id'], true, true );
        $topic_id = bbp_get_topic_id( $r['topic_id'] );
        $forum_id = bbp_get_forum_id( $r['forum_id'] );
        if ( empty( $user_id ) || ( empty( $topic_id ) && empty( $forum_id ) ) ) {
            return false;
        }

        // No link if you can't edit yourself
        if ( ! current_user_can( 'edit_user', (int) $user_id ) ) {
            return false;
        }

        // Check if viewing a single forum
        if ( empty( $topic_id ) && ! empty( $forum_id ) ) {

            // Decide which link to show
            $is_subscribed = bbp_is_user_subscribed_to_forum( $user_id, $forum_id );
            if ( ! empty( $is_subscribed ) ) {
                $text       = $r['unsubscribe'];
                $query_args = array( 'action' => 'bbp_unsubscribe', 'forum_id' => $forum_id );
            } else {
                $text       = $r['subscribe'];
                $query_args = array( 'action' => 'bbp_subscribe',   'forum_id' => $forum_id );
            }

            $sub  = $is_subscribed ? 'is-subscribed' : '';
            $html = sprintf( '%s', $sub );


        } else {

            // Decide which link to show
            $is_subscribed = bbp_is_user_subscribed_to_topic( $user_id, $topic_id );
            if ( ! empty( $is_subscribed ) ) {
                $text       = $r['unsubscribe'];
                $query_args = array( 'action' => 'bbp_unsubscribe', 'topic_id' => $topic_id );
            } else {
                $text       = $r['subscribe'];
                $query_args = array( 'action' => 'bbp_subscribe',   'topic_id' => $topic_id );
            }

            $sub  = $is_subscribed ? 'is-subscribed' : '';
            $html = sprintf( '%s', $sub );
        }

        // Return the link
        return apply_filters( 'bbp_get_user_subscribe_link', $html, $r, $user_id, $topic_id );
}