BBP_Akismet::filter_post_terms( string $terms = '', int $topic_id, int $reply_id )

	public function filter_post_terms( $terms = '', $topic_id = 0, $reply_id = 0 ) {

		// Validate the reply_id and topic_id
		$reply_id = bbp_get_reply_id( $reply_id );
		$topic_id = bbp_get_topic_id( $topic_id );

		// Get any pre-existing terms
		$existing_terms = wp_get_object_terms( $topic_id, bbp_get_topic_tag_tax_id(), array( 'fields' => 'names' ) );

		// Save the terms for later in case the reply gets hammed
		if ( !empty( $terms ) )
			update_post_meta( $reply_id, '_bbp_akismet_spam_terms', $terms );

		// Keep the topic tags the same for now
		return $existing_terms;
	}