function bbp_close_topic( $topic_id = 0 ) {

	// Get topic
	$topic = bbp_get_topic( $topic_id );
	if ( empty( $topic ) ) {
		return $topic;
	}

	// Get previous topic status meta
	$status       = bbp_get_closed_status_id();
	$topic_status = get_post_meta( $topic_id, '_bbp_status', true );

	// Bail if already closed and topic status meta exists
	if ( $status === $topic->post_status && ! empty( $topic_status ) ) {
		return false;
	}

	// Set status meta public
	$topic_status = $topic->post_status;

	// Execute pre close code
	do_action( 'bbp_close_topic', $topic_id );

	// Add pre close status
	add_post_meta( $topic_id, '_bbp_status', $topic_status );

	// Set closed status
	$topic->post_status = $status;

	// Toggle revisions off as we are not altering content
	if ( post_type_supports( bbp_get_topic_post_type(), 'revisions' ) ) {
		$revisions_removed = true;
		remove_post_type_support( bbp_get_topic_post_type(), 'revisions' );
	}

	// Update topic
	$topic_id = wp_update_post( $topic );

	// Toggle revisions back on
	if ( true === $revisions_removed ) {
		$revisions_removed = false;
		add_post_type_support( bbp_get_topic_post_type(), 'revisions' );
	}

	// Execute post close code
	do_action( 'bbp_closed_topic', $topic_id );

	// Return topic_id
	return $topic_id;
}