function bbp_new_topic_handler( $action = '' ) {

	// Bail if action is not bbp-new-topic
	if ( 'bbp-new-topic' !== $action ) {
		return;
	}

	// Nonce check
	if ( ! bbp_verify_nonce_request( 'bbp-new-topic' ) ) {
		bbp_add_error( 'bbp_new_topic_nonce', __( '<strong>ERROR</strong>: Are you sure you wanted to do that?', 'bbpress' ) );
		return;
	}

	// Define local variable(s)
	$view_all = false;
	$forum_id = $topic_author = 0;
	$topic_title = $topic_content = '';
	$anonymous_data = array();
	$terms = array( bbp_get_topic_tag_tax_id() => array() );

	/** Topic Author **********************************************************/

	// User is anonymous
	if ( bbp_is_anonymous() ) {

		// Filter anonymous data (variable is used later)
		$anonymous_data = bbp_filter_anonymous_post_data();

		// Anonymous data checks out, so set cookies, etc...
		bbp_set_current_anonymous_user_data( $anonymous_data );

	// User is logged in
	} else {

		// User cannot create topics
		if ( ! current_user_can( 'publish_topics' ) ) {
			bbp_add_error( 'bbp_topic_permission', __( '<strong>ERROR</strong>: You do not have permission to create new topics.', 'bbpress' ) );
			return;
		}

		// Topic author is current user
		$topic_author = bbp_get_current_user_id();
	}

	// Remove kses filters from title and content for capable users and if the nonce is verified
	if ( current_user_can( 'unfiltered_html' ) && ! empty( $_POST['_bbp_unfiltered_html_topic'] ) && wp_create_nonce( 'bbp-unfiltered-html-topic_new' ) === $_POST['_bbp_unfiltered_html_topic'] ) {
		remove_filter( 'bbp_new_topic_pre_title',   'wp_filter_kses'      );
		remove_filter( 'bbp_new_topic_pre_content', 'bbp_encode_bad',  10 );
		remove_filter( 'bbp_new_topic_pre_content', 'bbp_filter_kses', 30 );
	}

	/** Topic Title ***********************************************************/

	if ( ! empty( $_POST['bbp_topic_title'] ) ) {
		$topic_title = sanitize_text_field( $_POST['bbp_topic_title'] );
	}

	// Filter and sanitize
	$topic_title = apply_filters( 'bbp_new_topic_pre_title', $topic_title );

	// No topic title
	if ( empty( $topic_title ) ) {
		bbp_add_error( 'bbp_topic_title', __( '<strong>ERROR</strong>: Your topic needs a title.', 'bbpress' ) );
	}

	// Title too long
	if ( bbp_is_title_too_long( $topic_title ) ) {
		bbp_add_error( 'bbp_topic_title', __( '<strong>ERROR</strong>: Your title is too long.', 'bbpress' ) );
	}

	/** Topic Content *********************************************************/

	if ( ! empty( $_POST['bbp_topic_content'] ) ) {
		$topic_content = $_POST['bbp_topic_content'];
	}

	// Filter and sanitize
	$topic_content = apply_filters( 'bbp_new_topic_pre_content', $topic_content );

	// No topic content
	if ( empty( $topic_content ) ) {
		bbp_add_error( 'bbp_topic_content', __( '<strong>ERROR</strong>: Your topic cannot be empty.', 'bbpress' ) );
	}

	/** Topic Forum ***********************************************************/

	// Error check the POST'ed topic id
	if ( isset( $_POST['bbp_forum_id'] ) ) {

		// Empty Forum id was passed
		if ( empty( $_POST['bbp_forum_id'] ) ) {
			bbp_add_error( 'bbp_topic_forum_id', __( '<strong>ERROR</strong>: Forum ID is missing.', 'bbpress' ) );

		// Forum id is not a number
		} elseif ( ! is_numeric( $_POST['bbp_forum_id'] ) ) {
			bbp_add_error( 'bbp_topic_forum_id', __( '<strong>ERROR</strong>: Forum ID must be a number.', 'bbpress' ) );

		// Forum id might be valid
		} else {

			// Get the forum id
			$posted_forum_id = intval( $_POST['bbp_forum_id'] );

			// Forum id is empty
			if ( 0 === $posted_forum_id ) {
				bbp_add_error( 'bbp_topic_forum_id', __( '<strong>ERROR</strong>: Forum ID is missing.', 'bbpress' ) );

			// Forum id is a negative number
			} elseif ( 0 > $posted_forum_id ) {
				bbp_add_error( 'bbp_topic_forum_id', __( '<strong>ERROR</strong>: Forum ID cannot be a negative number.', 'bbpress' ) );

			// Forum does not exist
			} elseif ( ! bbp_get_forum( $posted_forum_id ) ) {
				bbp_add_error( 'bbp_topic_forum_id', __( '<strong>ERROR</strong>: Forum does not exist.', 'bbpress' ) );

			// Use the POST'ed forum id
			} else {
				$forum_id = $posted_forum_id;
			}
		}
	}

	// Forum exists
	if ( ! empty( $forum_id ) ) {

		// Forum is a category
		if ( bbp_is_forum_category( $forum_id ) ) {
			bbp_add_error( 'bbp_new_topic_forum_category', __( '<strong>ERROR</strong>: This forum is a category. No topics can be created in this forum.', 'bbpress' ) );

		// Forum is not a category
		} else {

			// Forum is closed and user cannot access
			if ( bbp_is_forum_closed( $forum_id ) && ! current_user_can( 'edit_forum', $forum_id ) ) {
				bbp_add_error( 'bbp_new_topic_forum_closed', __( '<strong>ERROR</strong>: This forum has been closed to new topics.', 'bbpress' ) );
			}

			// Forum is private and user cannot access
			if ( bbp_is_forum_private( $forum_id ) && ! current_user_can( 'read_forum', $forum_id ) ) {
				bbp_add_error( 'bbp_new_topic_forum_private', __( '<strong>ERROR</strong>: This forum is private and you do not have the capability to read or create new topics in it.', 'bbpress' ) );

			// Forum is hidden and user cannot access
			} elseif ( bbp_is_forum_hidden( $forum_id ) && ! current_user_can( 'read_forum', $forum_id ) ) {
				bbp_add_error( 'bbp_new_topic_forum_hidden', __( '<strong>ERROR</strong>: This forum is hidden and you do not have the capability to read or create new topics in it.', 'bbpress' ) );
			}
		}
	}

	/** Topic Flooding ********************************************************/

	if ( ! bbp_check_for_flood( $anonymous_data, $topic_author ) ) {
		bbp_add_error( 'bbp_topic_flood', __( '<strong>ERROR</strong>: Slow down; you move too fast.', 'bbpress' ) );
	}

	/** Topic Duplicate *******************************************************/

	if ( ! bbp_check_for_duplicate( array( 'post_type' => bbp_get_topic_post_type(), 'post_author' => $topic_author, 'post_content' => $topic_content, 'anonymous_data' => $anonymous_data ) ) ) {
		bbp_add_error( 'bbp_topic_duplicate', __( '<strong>ERROR</strong>: Duplicate topic detected; it looks as though you&#8217;ve already said that.', 'bbpress' ) );
	}

	/** Topic Bad Words *******************************************************/

	if ( ! bbp_check_for_moderation( $anonymous_data, $topic_author, $topic_title, $topic_content, true ) ) {
		bbp_add_error( 'bbp_topic_moderation', __( '<strong>ERROR</strong>: Your topic cannot be created at this time.', 'bbpress' ) );
	}

	/** Topic Status **********************************************************/

	// Get available topic statuses
	$topic_statuses = bbp_get_topic_statuses();

	// Maybe put into moderation
	if ( ! bbp_check_for_moderation( $anonymous_data, $topic_author, $topic_title, $topic_content ) ) {
		$topic_status = bbp_get_pending_status_id();

	// Check possible topic status ID's
	} elseif ( ! empty( $_POST['bbp_topic_status'] ) && in_array( $_POST['bbp_topic_status'], array_keys( $topic_statuses ), true ) ) {
		$topic_status = sanitize_key( $_POST['bbp_topic_status'] );

	// Default to published if nothing else
	} else {
		$topic_status = bbp_get_public_status_id();
	}

	/** Topic Tags ************************************************************/

	if ( bbp_allow_topic_tags() && ! empty( $_POST['bbp_topic_tags'] ) ) {

		// Escape tag input
		$terms = sanitize_text_field( $_POST['bbp_topic_tags'] );

		// Explode by comma
		if ( strstr( $terms, ',' ) ) {
			$terms = explode( ',', $terms );
		}

		// Add topic tag ID as main key
		$terms = array( bbp_get_topic_tag_tax_id() => $terms );
	}

	/** Additional Actions (Before Save) **************************************/

	do_action( 'bbp_new_topic_pre_extras', $forum_id );

	// Bail if errors
	if ( bbp_has_errors() ) {
		return;
	}

	/** No Errors *************************************************************/

	// Add the content of the form to $topic_data as an array.
	// Just in time manipulation of topic data before being created
	$topic_data = apply_filters( 'bbp_new_topic_pre_insert', array(
		'post_author'    => $topic_author,
		'post_title'     => $topic_title,
		'post_content'   => $topic_content,
		'post_status'    => $topic_status,
		'post_parent'    => $forum_id,
		'post_type'      => bbp_get_topic_post_type(),
		'tax_input'      => $terms,
		'comment_status' => 'closed'
	) );

	// Insert topic
	$topic_id = wp_insert_post( $topic_data, true );

	/** No Errors *************************************************************/

	if ( ! empty( $topic_id ) && ! is_wp_error( $topic_id ) ) {

		/** Close Check *******************************************************/

		// If the topic is closed, close it properly
		if ( ( get_post_field( 'post_status', $topic_id ) === bbp_get_closed_status_id() ) || ( $topic_data['post_status'] === bbp_get_closed_status_id() ) ) {

			// Close the topic
			bbp_close_topic( $topic_id );
		}

		/** Trash Check *******************************************************/

		// If the forum is trash, or the topic_status is switched to
		// trash, trash the topic properly
		if ( ( get_post_field( 'post_status', $forum_id ) === bbp_get_trash_status_id() ) || ( $topic_data['post_status'] === bbp_get_trash_status_id() ) ) {

			// Trash the topic
			wp_trash_post( $topic_id );

			// Force view=all
			$view_all = true;
		}

		/** Spam Check ********************************************************/

		// If the topic is spam, officially spam this topic
		if ( $topic_data['post_status'] === bbp_get_spam_status_id() ) {
			add_post_meta( $topic_id, '_bbp_spam_meta_status', bbp_get_public_status_id() );

			// Force view=all
			$view_all = true;
		}

		/** Update counts, etc... *********************************************/

		do_action( 'bbp_new_topic', $topic_id, $forum_id, $anonymous_data, $topic_author );

		/** Additional Actions (After Save) ***********************************/

		do_action( 'bbp_new_topic_post_extras', $topic_id );

		/** Redirect **********************************************************/

		// Redirect to
		$redirect_to = bbp_get_redirect_to();

		// Get the topic URL
		$redirect_url = bbp_get_topic_permalink( $topic_id, $redirect_to );

		// Add view all?
		if ( bbp_get_view_all() || ! empty( $view_all ) ) {

			// User can moderate, so redirect to topic with view all set
			if ( current_user_can( 'moderate', $topic_id ) ) {
				$redirect_url = bbp_add_view_all( $redirect_url );

			// User cannot moderate, so redirect to forum
			} else {
				$redirect_url = bbp_get_forum_permalink( $forum_id );
			}
		}

		// Allow to be filtered
		$redirect_url = apply_filters( 'bbp_new_topic_redirect_to', $redirect_url, $redirect_to, $topic_id );

		/** Successful Save ***************************************************/

		// Redirect back to new topic
		bbp_redirect( $redirect_url );

	/** Errors ****************************************************************/

	// WP_Error
	} elseif ( is_wp_error( $topic_id ) ) {
		bbp_add_error( 'bbp_topic_error', sprintf( __( '<strong>ERROR</strong>: The following problem(s) occurred: %s', 'bbpress' ), $topic_id->get_error_message() ) );

	// Generic error
	} else {
		bbp_add_error( 'bbp_topic_error', __( '<strong>ERROR</strong>: The topic was not created.', 'bbpress' ) );
	}
}