BP_REST_Topics_Endpoint::get_topic_tags( int $topic_id )

	public function get_topic_tags( $topic_id ) {

		if ( empty( $topic_id ) ) {
			return;
		}

		// Topic is spammed so display pre-spam terms.
		if ( bbp_is_topic_spam( $topic_id ) ) {

			// Get pre-spam terms.
			$new_terms = get_post_meta( $topic_id, '_bbp_spam_topic_tags', true );

			// If terms exist, explode them and compile the return value.
			if ( empty( $new_terms ) ) {
				$new_terms = '';
			}

			// Topic is not spam so get real terms.
		} else {
			$terms = array_filter( (array) get_the_terms( $topic_id, bbp_get_topic_tag_tax_id() ) );

			// Loop through them.
			foreach ( $terms as $term ) {
				$new_terms[] = $term->name;
			}
		}

		// Set the return value.
		$topic_tags = ( ! empty( $new_terms ) ) ? implode( ', ', $new_terms ) : '';

		return apply_filters( 'bbp_get_form_topic_tags', esc_attr( $topic_tags ) );
	}