if ( isset( $this->mapping['user_slug'][ $author_slug ] ) ) {
					$data['post_author'] = $this->mapping['user_slug'][ $author_slug ];
				} else {
					$this->logger->warning( sprintf(
						__( 'Could not find the author for "%s" (post #%d)', 'wordpress-importer' ),
						get_the_title( $post_id ),
						$post_id
					) );
					$this->logger->debug( sprintf(
						__( 'Post %d was imported with author "%s", but could not be found', 'wordpress-importer' ),
						$post_id,
						$author_slug
					) );
				}
			}

			$has_attachments = get_post_meta( $post_id, '_wxr_import_has_attachment_refs', true );
			if ( ! empty( $has_attachments ) ) {
				$post = get_post( $post_id );
				$content = $post->post_content;

				// Replace all the URLs we've got
				$new_content = str_replace( array_keys( $this->url_remap ), $this->url_remap, $content );
				if ( $new_content !== $content ) {
					$data['post_content'] = $new_content;
				}
			}

			if ( get_post_type( $post_id ) === 'nav_menu_item' ) {
				$this->post_process_menu_item( $post_id );
			}

			// Do we have updates to make?
			if ( empty( $data ) ) {
				$this->logger->debug( sprintf(
					__( 'Post %d was marked for post-processing, but none was required.', 'wordpress-importer' ),
					$post_id
				) );
				continue;
			}

			// Run the update
			$data['ID'] = $post_id;
			$result = wp_update_post( $data, true );
			if ( is_wp_error( $result ) ) {
				$this->logger->warning( sprintf(
					__( 'Could not update "%s" (post #%d) with mapped data', 'wordpress-importer' ),
					get_the_title( $post_id ),
					$post_id
				) );
				$this->logger->debug( $result->get_error_message() );
				continue;
			}

			// Clear out our temporary meta keys
			delete_post_meta( $post_id, '_wxr_import_parent' );
			delete_post_meta( $post_id, '_wxr_import_user_slug' );
			delete_post_meta( $post_id, '_wxr_import_has_attachment_refs' );
		}
	}

	protected function post_process_menu_item( $post_id ) {
		$menu_object_id = get_post_meta( $post_id, '_wxr_import_menu_item', true );
		if ( empty( $menu_object_id ) ) {
			// No processing needed!
			return;
		}

		$menu_item_type = get_post_meta( $post_id, '_menu_item_type', true );
		switch ( $menu_item_type ) {
			case 'taxonomy':
				if ( isset( $this->mapping['term_id'][ $menu_object_id ] ) ) {
					$menu_object = $this->mapping['term_id'][ $menu_object_id ];
				}
				break;

			case 'post_type':
				if ( isset( $this->mapping['post'][ $menu_object_id ] ) ) {
					$menu_object = $this->mapping['post'][ $menu_object_id ];
				}
				break;

			default:
				// Cannot handle this.
				return;
		}

		if ( ! empty( $menu_object ) ) {
			update_post_meta( $post_id, '_menu_item_object_id', wp_slash( $menu_object ) );
		} else {
			$this->logger->warning( sprintf(
				__( 'Could not find the menu object for "%s" (post #%d)', 'wordpress-importer' ),
				get_the_title( $post_id ),
				$post_id
			) );
			$this->logger->debug( sprintf(
				__( 'Post %d was imported with object "%d" of type "%s", but could not be found', 'wordpress-importer' ),
				$post_id,
				$menu_object_id,
				$menu_item_type
			) );
		}

		delete_post_meta( $post_id, '_wxr_import_menu_item' );
	}


	protected function post_process_comments( $todo ) {
		foreach ( $todo as $comment_id => $_ ) {
			$data = array();

			$parent_id = get_comment_meta( $comment_id, '_wxr_import_parent', true );
			if ( ! empty( $parent_id ) ) {
				// Have we imported the parent now?
				if ( isset( $this->mapping['comment'][ $parent_id ] ) ) {
					$data['comment_parent'] = $this->mapping['comment'][ $parent_id ];
				} else {
					$this->logger->warning( sprintf(
						__( 'Could not find the comment parent for comment #%d', 'wordpress-importer' ),
						$comment_id
					) );
					$this->logger->debug( sprintf(
						__( 'Comment %d was imported with parent %d, but could not be found', 'wordpress-importer' ),
						$comment_id,
						$parent_id
					) );
				}
			}

			$author_id = get_comment_meta( $comment_id, '_wxr_import_user', true );
			if ( ! empty( $author_id ) ) {
				// Have we imported the user now?
				if ( isset( $this->mapping['user'][ $author_id ] ) ) {
					$data['user_id'] = $this->mapping['user'][ $author_id ];
				} else {
					$this->logger->warning( sprintf(
						__( 'Could not find the author for comment #%d', 'wordpress-importer' ),
						$comment_id
					) );
					$this->logger->debug( sprintf(
						__( 'Comment %d was imported with author %d, but could not be found', 'wordpress-importer' ),
						$comment_id,
						$author_id
					) );
				}
			}

			// Do we have updates to make?
			if ( empty( $data ) ) {
				continue;
			}

			// Run the update
			$data['comment_ID'] = $comment_ID;
			$result = wp_update_comment( wp_slash( $data ) );
			if ( empty( $result ) ) {
				$this->logger->warning( sprintf(
					__( 'Could not update comment #%d with mapped data', 'wordpress-importer' ),
					$comment_id
				) );
				continue;
			}

			// Clear out our temporary meta keys
			delete_comment_meta( $comment_id, '_wxr_import_parent' );
			delete_comment_meta( $comment_id, '_wxr_import_user' );
		}
	}


	/**
	 * There is no explicit 'top' or 'root' for a hierarchy of WordPress terms
	 * Terms without a parent, or parent=0 are either unconnected (orphans)
	 * or top-level siblings without an explicit root parent
	 * An unconnected term (orphan) should have a null parent_slug
	 * Top-level siblings without an explicit root parent, shall be identified
	 * with the parent_slug: top
	 * [we'll map parent_slug: top into parent 0]
	 */
	protected function post_process_terms( $terms_to_be_remapped ) {
		$this->mapping['term_slug']['top'] = 0;
		// The term_id and term_taxonomy are passed-in with $this->requires_remapping['term'].
		foreach ( $terms_to_be_remapped as $termid => $term_taxonomy ) {
			// Basic check.
			if( empty( $termid ) || ! is_numeric( $termid ) ) {
				$this->logger->warning( sprintf(
					__( 'Faulty term_id provided in terms-to-be-remapped array %s', 'wordpress-importer' ),
					$termid
					) );
				continue;
			}
			// This cast to integer may be unnecessary.
			$term_id = (int) $termid;

			if( empty( $term_taxonomy ) ){
				$this->logger->warning( sprintf(
					__( 'No taxonomy provided in terms-to-be-remapped array for term #%d', 'wordpress-importer' ),
					$term_id
					) );
				continue;
			}

			$data = array();
			$parent_slug = get_term_meta( $term_id, '_wxr_import_parent', true );

			if ( empty( $parent_slug ) ) {
				$this->logger->warning( sprintf(
					__( 'No parent_slug identified in remapping-array for term: %d', 'wordpress-importer' ),
					$term_id
					) );
				continue;
			}

			if ( ! isset( $this->mapping['term_slug'][ $parent_slug ] ) || ! is_numeric( $this->mapping['term_slug'][ $parent_slug ] ) ) {
				$this->logger->warning( sprintf(
					__( 'The term(%d)"s parent_slug (%s) is not found in the remapping-array.', 'wordpress-importer' ),
					$term_id,
					$parent_slug
					) );
				continue;
			}

			$mapped_parent = (int) $this->mapping['term_slug'][ $parent_slug ];

			$termattributes = get_term_by( 'id', $term_id, $term_taxonomy, ARRAY_A );
			// Note: the default OBJECT return results in a reserved-word clash with 'parent' [$termattributes->parent], so instead return an associative array.

			if ( empty( $termattributes ) ) {
				$this->logger->warning( sprintf(
					__( 'No data returned by get_term_by for term_id #%d', 'wordpress-importer' ),
					$term_id
					) );
				continue;
			}
			// Check if the correct parent id is already correctly mapped.
			if ( isset( $termattributes['parent'] ) &&  $termattributes['parent'] == $mapped_parent ) {
				// Clear out our temporary meta key.
				delete_term_meta( $term_id, '_wxr_import_parent' );
				continue;
			}

			// Otherwise set the mapped parent and update the term.
			$termattributes['parent'] = $mapped_parent;

			$result = wp_update_term( $term_id, $termattributes['taxonomy'], $termattributes );

			if ( is_wp_error( $result ) ) {
			$this->logger->warning( sprintf(
					__( 'Could not update "%s" (term #%d) with mapped data', 'wordpress-importer' ),
					$termattributes['name'],
					$term_id
				) );
				$this->logger->debug( $result->get_error_message() );
				continue;
			}
			// Clear out our temporary meta key.
			delete_term_meta( $term_id, '_wxr_import_parent' );
			$this->logger->debug( sprintf(
				__( 'Term %d was successfully updated with parent %d', 'wordpress-importer' ),
				$term_id,
				$mapped_parent
			) );
		}
	}


	/**
	 * Use stored mapping information to update old attachment URLs
	 */
	protected function replace_attachment_urls_in_content() {
		global $wpdb;
		// make sure we do the longest urls first, in case one is a substring of another
		uksort( $this->url_remap, array( $this, 'cmpr_strlen' ) );

		foreach ( $this->url_remap as $from_url => $to_url ) {
			// remap urls in post_content
			$query = $wpdb->prepare( "UPDATE {$wpdb->posts} SET post_content = REPLACE(post_content, %s, %s)", $from_url, $to_url );
			$wpdb->query( $query );

			// remap enclosure urls
			$query = $wpdb->prepare( "UPDATE {$wpdb->postmeta} SET meta_value = REPLACE(meta_value, %s, %s) WHERE meta_key='enclosure'", $from_url, $to_url );
			$result = $wpdb->query( $query );
		}
	}

	/**
	 * Update _thumbnail_id meta to new, imported attachment IDs
	 */
	function remap_featured_images() {
		// cycle through posts that have a featured image
		foreach ( $this->featured_images as $post_id => $value ) {
			if ( isset( $this->processed_posts[ $value ] ) ) {
				$new_id = $this->processed_posts[ $value ];

				// only update if there's a difference
				if ( $new_id !== $value ) {
					update_post_meta( $post_id, '_thumbnail_id', $new_id );
				}
			}
		}
	}

	/**
	 * Decide if the given meta key maps to information we will want to import
	 *
	 * @param string $key The meta key to check
	 * @return string|bool The key if we do want to import, false if not
	 */
	public function is_valid_meta_key( $key ) {
		// skip attachment metadata since we'll regenerate it from scratch
		// skip _edit_lock as not relevant for import
		if ( in_array( $key, array( '_wp_attached_file', '_wp_attachment_metadata', '_edit_lock' ) ) ) {
			return false;
		}

		return $key;
	}

	/**
	 * Decide what the maximum file size for downloaded attachments is.
	 * Default is 0 (unlimited), can be filtered via import_attachment_size_limit
	 *
	 * @return int Maximum attachment file size to import
	 */
	protected function max_attachment_size() {
		return apply_filters( 'import_attachment_size_limit', 0 );
	}

	/**
	 * Added to http_request_timeout filter to force timeout at 60 seconds during import
	 *
	 * @access protected
	 * @return int 60
	 */
	function bump_request_timeout($val) {
		return 60;
	}

	// return the difference in length between two strings
	function cmpr_strlen( $a, $b ) {
		return strlen( $b ) - strlen( $a );
	}

	/**
	 * Prefill existing post data.
	 *
	 * This preloads all GUIDs into memory, allowing us to avoid hitting the
	 * database when we need to check for existence. With larger imports, this
	 * becomes prohibitively slow to perform SELECT queries on each.
	 *
	 * By preloading all this data into memory, it's a constant-time lookup in
	 * PHP instead. However, this does use a lot more memory, so for sites doing
	 * small imports onto a large site, it may be a better tradeoff to use
	 * on-the-fly checking instead.
	 */
	protected function prefill_existing_posts() {
		global $wpdb;
		$posts = $wpdb->get_results( "SELECT ID, guid FROM {$wpdb->posts}" );

		foreach ( $posts as $item ) {
			$this->exists['post'][ $item->guid ] = $item->ID;
		}
	}

	/**
	 * Does the post exist?
	 *
	 * @param array $data Post data to check against.
	 * @return int|bool Existing post ID if it exists, false otherwise.
	 */
	protected function post_exists( $data ) {
		// Constant-time lookup if we prefilled
		$exists_key = $data['guid'];

		if ( $this->options['prefill_existing_posts'] ) {
			return isset( $this->exists['post'][ $exists_key ] ) ? $this->exists['post'][ $exists_key ] : false;
		}

		// No prefilling, but might have already handled it
		if ( isset( $this->exists['post'][ $exists_key ] ) ) {
			return $this->exists['post'][ $exists_key ];
		}

		// Still nothing, try post_exists, and cache it
		$exists = post_exists( $data['post_title'], $data['post_content'], $data['post_date'] );
		$this->exists['post'][ $exists_key ] = $exists;

		return $exists;
	}

	/**
	 * Mark the post as existing.
	 *
	 * @param array $data Post data to mark as existing.
	 * @param int $post_id Post ID.
	 */
	protected function mark_post_exists( $data, $post_id ) {
		$exists_key = $data['guid'];
		$this->exists['post'][ $exists_key ] = $post_id;
	}

	/**
	 * Prefill existing comment data.
	 *
	 * @see self::prefill_existing_posts() for justification of why this exists.
	 */
	protected function prefill_existing_comments() {
		global $wpdb;
		$posts = $wpdb->get_results( "SELECT comment_ID, comment_author, comment_date FROM {$wpdb->comments}" );

		foreach ( $posts as $item ) {
			$exists_key = sha1( $item->comment_author . ':' . $item->comment_date );
			$this->exists['comment'][ $exists_key ] = $item->comment_ID;
		}
	}

	/**
	 * Does the comment exist?
	 *
	 * @param array $data Comment data to check against.
	 * @return int|bool Existing comment ID if it exists, false otherwise.
	 */
	protected function comment_exists( $data ) {
		$exists_key = sha1( $data['comment_author'] . ':' . $data['comment_date'] );

		// Constant-time lookup if we prefilled
		if ( $this->options['prefill_existing_comments'] ) {
			return isset( $this->exists['comment'][ $exists_key ] ) ? $this->exists['comment'][ $exists_key ] : false;
		}

		// No prefilling, but might have already handled it
		if ( isset( $this->exists['comment'][ $exists_key ] ) ) {
			return $this->exists['comment'][ $exists_key ];
		}

		// Still nothing, try comment_exists, and cache it
		$exists = comment_exists( $data['comment_author'], $data['comment_date'] );
		$this->exists['comment'][ $exists_key ] = $exists;

		return $exists;
	}

	/**
	 * Mark the comment as existing.
	 *
	 * @param array $data Comment data to mark as existing.
	 * @param int $comment_id Comment ID.
	 */
	protected function mark_comment_exists( $data, $comment_id ) {
		$exists_key = sha1( $data['comment_author'] . ':' . $data['comment_date'] );
		$this->exists['comment'][ $exists_key ] = $comment_id;
	}

	/**
	 * Prefill existing term data.
	 *
	 * @see self::prefill_existing_posts() for justification of why this exists.
	 */
	protected function prefill_existing_terms() {
		global $wpdb;
		$query = "SELECT t.term_id, tt.taxonomy, t.slug FROM {$wpdb->terms} AS t";
		$query .= " JOIN {$wpdb->term_taxonomy} AS tt ON t.term_id = tt.term_id";
		$terms = $wpdb->get_results( $query );

		foreach ( $terms as $item ) {
			$exists_key = sha1( $item->taxonomy . ':' . $item->slug );
			$this->exists['term'][ $exists_key ] = $item->term_id;
		}
	}

	/**
	 * Does the term exist?
	 *
	 * @param array $data Term data to check against.
	 * @return int|bool Existing term ID if it exists, false otherwise.
	 */
	protected function term_exists( $data ) {
		$exists_key = sha1( $data['taxonomy'] . ':' . $data['slug'] );

		// Constant-time lookup if we prefilled
		if ( $this->options['prefill_existing_terms'] ) {
			return isset( $this->exists['term'][ $exists_key ] ) ? $this->exists['term'][ $exists_key ] : false;
		}

		// No prefilling, but might have already handled it
		if ( isset( $this->exists['term'][ $exists_key ] ) ) {
			return $this->exists['term'][ $exists_key ];
		}

		// Still nothing, try comment_exists, and cache it
		$exists = term_exists( $data['slug'], $data['taxonomy'] );
		if ( is_array( $exists ) ) {
			$exists = $exists['term_id'];
		}

		$this->exists['term'][ $exists_key ] = $exists;

		return $exists;
	}

	/**
	 * Mark the term as existing.
	 *
	 * @param array $data Term data to mark as existing.
	 * @param int $term_id Term ID.
	 */
	protected function mark_term_exists( $data, $term_id ) {
		$exists_key = sha1( $data['taxonomy'] . ':' . $data['slug'] );
		$this->exists['term'][ $exists_key ] = $term_id;
	}
}