2.1.0

SEO compatibility checked on the real plugins, instant chapter turns, a Chapters panel in the editor, a clean uninstall, and posts built with a page builder left alone. Content and settings need no change; no database upgrade.

Added

• All in One SEO and The SEO Framework integrations, next to Yoast SEO, Rank Math and SEOPress (classes/seo/, one PChap_SEO_Integration per plugin, registered only when the plugin is active; the pchap_seo_integrations filter adds more)

• bin/check-seo.sh: checks the chapters against the five SEO plugins, installed from wordpress.org on the wp-env site (title, canonical, Open Graph, robots, rel links)

• Instant chapter turns (WordPress 6.8+): on a chapter, a speculation rule prefetches the navigation and table of contents links when the reader hovers or focuses them (moderate; WordPress only prefetched on the press of the click). WordPress prints speculation rules for visitors who are not logged in, on sites with pretty permalinks. New filters pchap_speculation_rule and pchap_speculation_mode (prerender). Checked in Chrome: hovering the "Continue" link requests the next chapter without a click

• Tests for custom post types (flat, hierarchical, plain permalinks), and a CI job that runs the suite with a Redis object cache

• Tests that catch the mistakes of a release: the version of the plugin header, PCHAP_VERSION, block.json, index.asset.php, readme.txt, the README badge and the changelogs must agree; every stylesheet and script the plugin loads must exist (LTR, RTL, minified or not); the block metadata copied in blocks/subpage/index.js must match block.json. tests/test-plugin-loaded.php no longer holds the version, so a release has one place less to change

• Chapters panel in the document sidebar of the block editor: the chapters of the post, in order (click one to select it and scroll to it), and a Turn N headings into chapters button with a heading level (H2, H3 or H4). Each top-level heading becomes a Chapter block where it stands, with a single undo step and a notice. It runs in the same script as the block (blocks/subpage/index.js), which now depends on wp-plugins, wp-data, wp-components, wp-editor and wp-dom-ready. Checked in the real editor, in English and French

• Block transforms: a heading or a core page break becomes a Chapter block, and a Chapter block becomes a heading, from the block switcher. The saved markup of the block is unchanged

• Nine strings of the editor interface, translated in French, German, Spanish and Italian; a fourth screenshot of the panel for the WordPress.org listing

Fixed

• Page builders: a post built with the Elementor editor showed the whole post on every chapter, and a table of contents next to it, because Elementor replaces the content by its own layout and ignores the pages (checked with Elementor 4.4.0). The plugin now leaves posts rendered by Elementor, Divi (_et_pb_use_builder), Beaver Builder (_fl_builder_enabled) and Bricks (_bricks_editor_mode) alone; only Elementor is tested. New filter pchap_is_builder_post. Posts written in the block or classic editor and displayed with Elementor's Canvas and Full Width templates work as before (checked too)

• Uninstall (deleting the plugin from the Plugins screen) left traces. With a persistent object cache (Redis, Memcached), the _mpp_data index stayed readable from the cache of each post, and the parsed chapters stayed cached; both are now cleared. The events of the background rebuild are removed whatever their arguments. uninstall.php now uses delete_post_meta_by_key(), wp_unschedule_hook() and wp_cache_flush_group(). A test lets the plugin live (activation, settings, posts, a rebuild, its lock), uninstalls it, and checks that no table holds anything of it

• SEO plugins, found by testing the real plugins (Yoast SEO 28.8, Rank Math 1.0.281, SEOPress 10.4, All in One SEO 5.0.5, The SEO Framework 5.2.0):

  • All in One SEO set every chapter after the first to noindex, nofollow (its default "noindex paginated pages"). Chapters now get the robots of the post
  • SEOPress gave every chapter the post URL as canonical, which tells search engines each chapter duplicates the first page. The canonical is now the chapter URL
  • Yoast SEO kept the post URL in og:url and in the schema WebPage url of every chapter; both are now the chapter URL
  • Rank Math and SEOPress, whose default title templates have no page variable, gave every chapter the same <title> and the same social titles; All in One SEO and The SEO Framework ended the title with "Page N". The chapter title now appears in the <title> and the Open Graph and Twitter titles of any SEO plugin
  • All in One SEO and The SEO Framework printed their own rel prev/next next to ours

• The admin stylesheet loads again: 2.0.0 enqueued admin/css/multipage-admin[.min].css, a file renamed to post-chapters-admin[.min].css, so every admin page requested a missing file (404) and the settings screens lost their styles. The style handle is now post-chapters-admin

Changed

• The stylesheet of the chapters (about 1 KB minified) is printed inline by WordPress instead of being requested as a file: one request less on each chapter. A stylesheet of the theme (css/post-chapters.css) gets the same treatment, within the limit of the core styles_inline_size_limit filter
• Code structure: PChap no longer holds the SEO and comments code. It moves to two components created with the instance, pchap()->seo (PChap_SEO: document title, rel prev/next links, Yoast SEO / Rank Math / SEOPress) and pchap()->comments (PChap_Comments). The former PChap methods (e.g. pchap_rel_links(), filter_wpseo_replacements(), hide_comments()) still work, as deprecated methods that delegate
• The settings screens are built from one description per option, pchap_get_settings_sections() and pchap_get_settings_fields(), rendered by pchap_admin_render_option_field(). The twelve pchap_admin_*_callback_*() field callbacks are deprecated wrappers. The HTML of the screens is unchanged

Development

• WordPress.org listing assets in .wordpress-org/: new screenshots (settings, block editor, a post split into chapters, on WordPress 7.1 with Twenty Twenty-Five), banners (772×250, 1544×500) and icons (128×128, 256×256, SVG)

• wp-env runs a single environment (.wp-env.json, "testsEnvironment": false, WP_DEBUG and SCRIPT_DEBUG off): composer test:wp-env and CI run PHPUnit in its cli container instead of the deprecated tests-cli container, and the development site at http://localhost:8888 is the same environment (the test run reinstalls its database)

• The documentation uses npx @wordpress/env@12 instead of npx wp-env (the npm package wp-env is unrelated)

• bin/build-zip.sh --wporg builds build/post-chapters-wporg.zip for WordPress.org: the same files, without the Update URI header. It passes Plugin Check (mode "new") with no error or warning

Changed

• The internal helpers are prefixed pchap_ instead of _pchap_, which Plugin Check does not accept (e.g. _pchap_link_page_url() is now pchap_link_page_url(), _pchap_get_valid_option() is now pchap_get_valid_option()). They are private (@access private) and get no deprecated alias
• The subpage index rebuild queries are written out as literal prepared statements; _pchap_rebuild_candidates_where() is replaced by pchap_rebuild_candidates_args()
• readme.txt: caption of the third screenshot

2.0.0

Multipage becomes Post Chapters, a plugin of its own: new name, slug post-chapters, text domain post-chapters and code prefix pchap. The WordPress.org listing of Multipage (sgr-nextpage-titles) stays with its original author. Content and settings need no change: everything stored in the database or in the posts keeps its name.

Migrating from Multipage

1. Install and activate Post Chapters. While Multipage is active, Post Chapters stays idle and shows an admin notice
2. Deactivate Multipage. On the next admin page load, the 2.0 upgrade routine (database version 2000) moves a pending subpage index rebuild from the mpp_rebuild_postmeta_batch WP-Cron event to pchap_rebuild_postmeta_batch
3. Delete the sgr-nextpage-titles folder over FTP or SSH. Do not use Delete on the Plugins screen: the uninstall routine of Multipage 1.5.15 to 1.7.1 erases the options and the _mpp_data meta that Post Chapters reuses (the uninstall routine of Post Chapters erases them too, and now also clears the old WP-Cron event)

Kept for compatibility

• The [nextpage] shortcode and the multipage/subpage block name (stored in the posts; the block save() output is unchanged)
• The option names (mpp-*, _mpp-*, _mpp_db_version, the 1.3 multipage option) and the _mpp_data post meta
• The HTML classes (.mpp-toc-container, .mpp-toc, .mpp-post-navigation...) and the data-mpp-title attribute of the classic editor placeholders
• Theme stylesheets named css/multipage[-rtl][.min].css: still loaded, after css/post-chapters[-rtl][.min].css in the same theme (child theme first, then parent theme)
• The wp multipage WP-CLI command, now an alias of wp post-chapters

Changed

• Plugin name Post Chapters, main file post-chapters.php, plugin folder post-chapters, text domain post-chapters, Update URI: https://github.com/PaulArgoud/post-chapters
• Interface wording: subpage becomes chapter everywhere (block title "Chapter", editor buttons, settings, admin notices, WP-CLI output). The fallback title of an untitled page is "Chapter N" (was "Page N"), and the "page #" row labels of the table of contents read "Chapter #" (the stored option value is still page). Translations updated in French, German, Italian and Spanish
• Settings pages: options-general.php?page=post-chapters and ?page=post-chapters-advanced (were mpp-settings and mpp-advanced-settings); the settings groups were renamed the same way
• Object cache group post-chapters (was multipage), frontend style handle post-chapters / {theme}-post-chapters, TinyMCE plugin postchapters, TinyMCE command PCHAP_Subpage
• Files renamed: class-pchap.php, classes/class-pchap-*.php, inc/pchap-*.php, css/post-chapters*.css, admin/css/post-chapters-admin*.css, inc/admin/tinymce/css/post-chapters*.css, languages/post-chapters-*. Release archive post-chapters.zip

Removed (breaking for custom code)

• Every mpp_* / _mpp_* function, the Multipage, Multipage_Parser, MPP_Admin, Multipage_Plugin_Shortcodes and MPP_CLI_Command classes, the multipage() accessor and the MPP_* constants. They are renamed (pchap_*, _pchap_*, PChap, PChap_Parser, PChap_Admin, PChap_Shortcodes, PChap_CLI_Command, pchap(), PCHAP_*) without aliases: Multipage defines the old names, and both plugins can be installed side by side during the migration. The public $mpp_data property of the main instance is now $pchap_data; mpp_load_multipage_textdomain() is now pchap_load_textdomain()

Deprecated

• The mpp_* hooks. Every hook is now fired as pchap_* (e.g. pchap_toc, pchap_the_content, pchap_get_toc_position, pchap_on_update); callbacks attached to the old mpp_* name still run, after the pchap_* ones and with the same arguments, through apply_filters_deprecated() / do_action_deprecated() (a notice is logged when WP_DEBUG is on). New helpers pchap_apply_filters() and pchap_do_action()

Added

• Coexistence guard: pchap_is_multipage_active() detects an active Multipage (an existing sgr-nextpage-titles.php in any active plugin folder, or the Multipage class); Post Chapters then loads nothing but an admin notice telling how to switch safely
• 2.0 upgrade routine pchap_update_to_2_0() (database version 2000)
• Tests for the deprecated hooks, the guard and the 1.7 to 2.0 update (401 tests)

1.7.1

Translation and object cache fixes. No database change.

Fixed

• Translations ignored when a language pack is installed (user-reported on a production site): the language packs that translate.wordpress.org delivers for the sgr-nextpage-titles slug (de_DE, en_GB, es_ES, fr_FR, it_IT, nb_NO, nl_NL, tr_TR) translate the original plugin, without the strings of this version, and WordPress loaded them instead of the bundled files (e.g. "Continue:" and "Subpage navigation" stayed in English in French). For the bundled locales (fr_FR, de_DE, es_ES, it_IT), the bundled .l10n.php/.mo files and the block editor JSON files now replace the files of wp-content/languages/plugins; other locales still use their language pack. New filter mpp_prefer_bundled_translations (default true) to give the language packs precedence back
• Persistent object cache (Redis, Memcached): the parse cache key now depends on the parser code, not only on MPP_VERSION, so a page cut by another build of the same version (e.g. a pre-release 1.7.0) is no longer served for up to a day after an update

1.7.0

Major rewrite of the Subpage block, the content parser and the frontend rendering. Existing content needs no change: blocks saved by earlier versions stay valid, and the subpage index of every post is rebuilt in the background after the update.

Compatibility

• Tested up to WordPress 7.1.4 (iframed block editor, block themes such as Twenty Twenty-Five, classic themes such as Twenty Twenty-One) and PHP 7.4 to 8.4
• The plugin header declares Update URI: https://github.com/PaulArgoud/sgr-nextpage-titles: WordPress.org no longer offers updates from the listing of the same slug (owned by the original author, currently 1.5.12), so a future release there can never overwrite this version. Added after the 1.7.0 tag, and included in the 1.7.0 release archive together with readme.txt
• Minimum WordPress version raised from 5.0 to 6.3 (Requires at least: 6.3), required by the block.json registration and block apiVersion 3. PHP 7.4 is still the minimum
• Subpage block rewritten for the current block editor: registered from blocks/subpage/block.json (apiVersion 3, so it works in the iframed editor), plain ES5 script using the wp.* globals with no build step, translatable placeholder. Its save() output is byte-identical to previous versions, so every existing post stays valid (no "This block contains unexpected or invalid content" warning, no block recovery)
• The block is now registered on every request (init), whatever the editor in use, and still registers on third-party editor screens that do not bootstrap the server-side block definitions
• Classic Editor plugin detection (mpp_is_block_editor_active()) mirrors Classic Editor 1.7 settings, including the multisite network defaults and the "allow users to switch editors" option
• SEO plugins: dedicated integrations for Yoast SEO, Rank Math and SEOPress replace the old Yoast string replacement (which loaded the wordpress-seo text domain to replace "Page X of Y"). On subpages 2 and up, the subpage title fills the %%page%% (Yoast, SEOPress) or %page% (Rank Math) title variable. Each integration is only registered when that plugin is active

Fixed

• Broken page layout (user-reported on a production site): a [nextpage] shortcode placed inside <p>, <h2>, <h3 style="…">, <div> or in the middle of a paragraph left unclosed elements, so the table of contents and the navigation ended up nested inside a heading. Every subpage is now a balanced fragment: the blocks and elements open at the cut are closed at the end of the page and reopened on the next one
• Elements left empty by the cut (e.g. <h3 style="…">[nextpage]</h3>, also with only   or <br> next to the shortcode, or a paragraph/heading block holding only the shortcode) are removed instead of rendering as empty headings or paragraphs; whitespace next to the cut is trimmed (except in <pre>)
• Parser rewrite: titles and pages could get out of step (wrong title on a page, missing or extra subpages). Subpages are now derived from a single parse of the live post content, in document order:
  • untitled [nextpage] shortcodes and attribute-less Subpage blocks (saved without a title) now create their own subpage (fallback title "Page N") instead of being ignored or titled "false"
  • posts mixing Subpage blocks, [nextpage] shortcodes and core page breaks (<!--nextpage--> or the Page Break block) are split in document order; previously the shortcodes were ignored as soon as one block was found, and core breaks shifted every title
  • intro detection: an intro made only of an image, an embed or a dynamic block is recognized; whitespace,   and empty paragraphs before the first subpage no longer create an empty "Intro" page, and leading content that is not an intro (scripts, styles, separators) is kept on the first page instead of being lost
  • the self-closing block form and Subpage blocks nested in groups or columns are supported
  • [nextpage] inside an HTML comment, a tag attribute, a <script>/<style>/<textarea> element or a block delimiter is no longer treated as a page break, and the escaped [[nextpage]] is displayed literally
  • duplicate titles always get unique slugs (the 100-duplicate limit is gone)
• The frontend no longer depends on the _mpp_data post meta: posts imported, or edited while the plugin was inactive, no longer show an outdated table of contents
• Table of contents injected where it does not belong: the title, TOC and navigation are now only added to the multipage post rendered by the main query — no longer to related posts, Query Loop blocks, widgets, excerpts (get_the_excerpt(), the_excerpt(), direct wp_trim_excerpt() calls), descriptions built in wp_head, or password-protected posts before the password is entered
• The TOC is no longer added twice when a theme or page builder applies the_content again to the rendered output, or when a shortcode (box, tabs, accordion…) filters its inner content with the_content
• 1-based page handling: /post/ and /post/1/ are the same first page everywhere. "Display comments on: first page" now shows the comments on /post/1/, and the current TOC item, rel links, navigation and document title use the same page number
• Block themes: the "first page" / "last page" comments setting now also hides the comment blocks (core/comments and related blocks), not only the classic comments_template(); the standard page links appended by the Post Content block are hidden when "Disable the standard pagination" is checked, and still shown when it is not
• "Only on the first page" (table of contents) is now honored when the TOC is displayed below the content
• "Hide intro title" now also applies on /post/1/, and only when the first page is the automatic intro (a first subpage with its own title keeps it)
• Title escaping: one policy for every output. Block titles (HTML-encoded by the editor) keep their inline formatting (strong, em, code, mark, sub, sup…) in the heading, the TOC and the navigation instead of showing literal tags, and any other markup is stripped. Classic shortcode titles are treated as text, so C++ <T> or a < b & c display literally instead of being truncated or emptied. The document title and the SEO plugins receive plain text, without tags or entities
• SEO: with Yoast SEO, subpages 2 and up declared the first page as their canonical URL (which tells search engines to drop them); they now use their own URL, and a canonical set in Yoast is kept. Yoast SEO and Rank Math no longer print their own rel=prev / rel=next links on multipage posts (computed from the raw content, they could be wrong or duplicate the plugin's)
• Translations were never loaded: load_plugin_textdomain() was called without the languages/ path, so the bundled .mo files were ignored and the plugin always displayed English unless a language pack was installed
• TOC, navigation and rel link URLs always point to the multipage post (they were built from the global post), and use ?page=N whenever permalinks are plain (also when the permalink_structure option is missing)
• The navigation no longer prints the <!-- .nav-links --> / <!-- .mpp-post-navigation --> HTML comments, and the internal empty-page placeholder is never printed
• CSS: the TOC and the navigation use rem sizes and reset the typography (font size, weight and style, line height, text transform, letter spacing), so they no longer inherit the styles of a surrounding heading
• RTL: RTL sites requested css/multipage-rtl[.min].css and admin/css/multipage-admin-rtl[.min].css, which did not exist (404); both stylesheets are now shipped. The "align left" / "align right" TOC positions keep their physical side
• TinyMCE and Quicktags buttons: the typed title is now escaped (&, ", <, >, [, ]), so quotes no longer break the shortcode and markup cannot be injected; an empty or cancelled title inserts nothing (it used to throw a ReferenceError or re-insert the previous shortcode)
• Classic block: the [nextpage] placeholder was a blank image in the Classic block of the block editor; the plugin TinyMCE stylesheet is now loaded there too
• Backslashes in subpage titles are preserved when the _mpp_data index is saved
• The subpage index rebuild ("Build Multipage postmetas") loaded every matching post in a single request, skipped drafts and untitled shortcodes, and never removed stale entries; it now runs in batches, indexes every post that save_post indexes and deletes stale entries
• The 1.3 → 1.4 migration no longer runs a full synchronous rebuild on admin_init, which could exceed max_execution_time on large sites and retry on every admin request
• The updater treated 1.4–1.6 sites as fresh installs (so no upgrade routine could run); it now also reads the stored _mpp_db_version

Changed

• Behaviour change: /post/1/ is now redirected (301) to the post permalink by WordPress core instead of being served as a duplicate of the first page
• Behaviour change: an out-of-range subpage (e.g. /post/99/) is redirected to the permalink, as WordPress does for posts split with core page breaks
• Behaviour change: in contexts where the content is not split (feeds, REST API, excerpts, other do_shortcode() callers), [nextpage] renders nothing; it used to output a <!--nextpage--> comment
• Behaviour change: with the bundled translations now loaded, the intro title "Intro" is displayed as "Introduction" in French ("Einleitung" in German, "Introducción" in Spanish, "Introduzione" in Italian)
• Behaviour change: settings fields added to the Multipage settings screens by third-party code with add_settings_field() are no longer saved automatically: register them with register_setting( 'mpp-settings', … ) (or 'mpp-advanced-settings' for the Advanced screen)
• Settings API: both settings sc...

1.5.15

Fixed

• XSS: subpage title now escaped with esc_html() in mpp_the_content() output
• XSS: translated strings in quicktag JS now escaped with esc_js() instead of raw _e()
• PHP 8.2: re-declared $admin property on Multipage class to prevent dynamic property deprecation warning
• mpp_pre_handle_404() returned null instead of true, failing to short-circuit the 404 handler
• versions() called get_option( null, 'multipage' ) with swapped arguments — corrected to get_option( 'multipage' )
• $comments_link potentially undefined before use in mpp_the_content() — now initialized
• Admin CSS enqueued without version string, preventing cache busting — now uses MPP_VERSION
• save_post hook ran on revisions and autosaves — now filtered with wp_is_post_revision() / wp_is_post_autosave()
• save_post() could crash if get_post() returned null — added guard
• mpp_the_title() loaded the wordpress-seo text domain even when Yoast SEO was not active — now guarded with defined( 'WPSEO_VERSION' )
• Double slash in hide_comments() path (MPP_PLUGIN_DIR . '/index.php')
• Navigation CSS class not sanitized — now uses sanitize_html_class()
• Missing text domain on __( 'Next page' ), __( 'Previous page' ), and __( 'Comments' ) in mpp-template.php
• _mpp_link_page_url() could crash if get_post() returned null — added guard
• Duplicate $handle assignment in MPP_Admin::enqueue_scripts()
• Plugin URI used http:// instead of https://
• MPP_VERSION constant was '1.5.14' while plugin header declared 1.5.15
• Comments link in TOC was missing <li> wrapper, producing invalid HTML
• multipage_return_array() returned an empty array instead of false when no valid shortcodes were found
• "Build Multipage postmetas" only found shortcode posts — now also detects Gutenberg block posts
• Plugin action links detection used fragile /trunk path hack — now uses plugin_basename()
• Security: missing exit after wp_safe_redirect() in both settings save functions — PHP continued executing after redirect
• esc_html() used instead of esc_attr() on radio input value attributes in settings page
• Operator precedence ambiguity in versions() — (int) cast applied to condition instead of ternary result
• Incorrect @since 1.6 docblock tags corrected to @since 1.5 (version 1.6 does not exist)
• Copy-paste docblock errors: mpp_hide_intro_title(), mpp_toc_only_on_the_first_page(), and mpp_hide_toc_header() incorrectly described as "standard WordPress pagination"
• SEO: rel=next link on the first page pointed to itself instead of page 2 — normalized page index in mpp_rel_links()
• Comments TOC link for first-page / last-page was missing #comments URL fragment — 'comments' was passed as $rel instead of $p parameter to _mpp_link_page()
• Swapped file headers: admin-settings.php said "Admin Advanced" and admin-advanced-settings.php said "Admin Settings"
• mpp_get_comments_on_page() docblock declared @return int but the function returns a string
• mpp_the_content filter docblock had wrong parameter names ($toc_labels instead of $toc) and types (array instead of string)
• mpp_link_pages_args filter docblock had @since 3.0.0 copied from WordPress core — corrected to @since 1.4
• Typo « fitler » corrected to « filter » in setup_actions() comment
• mpp_toc() default position was 'top_right' (underscore) instead of 'top-right' (hyphen), producing an invalid CSS class
• mpp_toc_pages_row filter docblock documented 2 parameters but 3 are passed ($row, $title, $i)
• Typo « positon » corrected to « position » in mpp_get_toc_position() filter docblock
• @param bool|string corrected to @param int for priority option defaults in mpp-options.php
• Missing $multipage parameter documented in mpp_link_pages() and mpp_toc() docblocks
• Redundant $post && check removed in mpp_pre_handle_404() — already validated above
• JS TypeError: cancelling the quicktag subpage prompt caused null.length crash — now checks for null explicitly
• CSS handle: enqueue_styles() used full filesystem path (get_stylesheet_directory()) as handle identifier — replaced with get_stylesheet() / get_template() slug
• mpp_get_admin_tabs() docblock declared @return string but the function returns an array
• mpp_get_db_version() and mpp_get_db_version_raw() docblocks declared @return string but the functions return an int
• Self-referencing @uses enqueue_styles() tag removed from enqueue_styles() docblock
• _mpp_link_page_url() docblock @param string $p Paragraph id corrected to « Fragment identifier »
• in_array() missing strict mode (true) in mpp_modify_admin_menu_highlight()
• mpp_toc() docblock for $pagelink incorrectly described as "Link text for the previous page link" — corrected to "Page number template; % is replaced by the page number"
• mpp_link_pages() docblock declared wrong defaults: $before = <p> Pages: / $after = </p> / $echo = 1|true — corrected to <div> / </div> / 0|false
• mpp_toc() docblock declared $echo default as 1|true — corrected to 0|false
• mpp_toc() docblock for $comments declared @type int|bool but actually receives an opening <a> tag or 0 — corrected to string|int
• Unused global $numpages declaration removed from mpp_toc()
• Dead JavaScript variable shortcode removed from quicktag prompt_subtitle() function
• Security: missing current_user_can( 'manage_options' ) check in mpp_admin_settings_save() and mpp_admin_advanced_settings_save() — added for defense-in-depth
• mpp_the_content filter docblock started with /* instead of /**, invisible to PHPDoc
• hide_standard_pagination() docblock missing @param and @return tags
• mpp_pre_handle_404() docblock missing @return tag
• mpp_add_post_multipage_meta() docblock missing @param for $update_option

Added

• Docblocks for frontend_init() and mpp_post() methods in Multipage class
• Docblock for _mpp_link_page() helper function in mpp-template.php
• uninstall.php to clean up all plugin options and _mpp_data post meta on deletion
• Requires at least: 5.0 and Requires PHP: 7.4 headers in plugin file
• History section in README.md documenting the plugin's origins and fork lineage
• aria-label attributes on TOC and navigation <nav> elements for accessibility

Changed

• _e() replaced with esc_html_e() in admin settings templates (17 occurrences) for translation security
• _mpp_link_page_url() called get_permalink() up to 3 times — now stored in a local variable
• $this->version now reads from MPP_VERSION constant instead of a hardcoded string
• All require() calls replaced with require_once (without parentheses) in class-mpp.php and class-mpp-admin.php
• sanitize_html_class() applied to TOC container position class
• mpp_is_block_editor_active() simplified — removed unnecessary WP < 5.0 and Gutenberg plugin checks
• TinyMCE disable setting description updated (no longer references WordPress 3.9)
• mpp_get_continue_or_prev_next() called once and stored instead of twice
• mpp_get_toc_position() called once and stored instead of three times in mpp_the_content()
• mpp_get_comments_on_page() called once and stored instead of twice in mpp_post()
• constant('MPP_PLUGIN_DIR') / constant('MPP_PLUGIN_URL') replaced with direct constant access in setup_globals()
• strip_tags() string allowlist updated to array form (recommended since PHP 7.4) in Multipage_Parser
• Redundant trailingslashit() removed from setup_globals() — plugin_dir_path() / plugin_dir_url() already add a trailing slash
• Redundant is_null( $post ) || empty( $post ) simplified to empty( $post ) in mpp_post()
• json_encode() replaced with wp_json_encode() in TinyMCE languages.php
• Minor formatting: added missing space in $this->page - 1 arithmetic expression
• Removed trailing semicolons (};) after ABSPATH guard closing braces in class-mpp.php and mpp-update.php
• Gutenberg block description replaced (was "lorem ipsum" placeholder)
• Gutenberg block script dependency changed from deprecated wp-editor to wp-block-editor
• Frontend CSS header updated to current author and HTTPS Plugin URI

Removed

• Obsolete WP < 4.4 title fallback in mpp_the_title()
• Orphaned <input type="checkbox"> and commented-out toggle HTML in TOC template
• Dead mpp_admin_settings_callback_excerpt_on_all_pages() (called non-existent mpp_excerpt_all_pages())
• Dead mpp_admin_settings_callback_prettylinks() (referenced old envire.it URL)
• Unused $notices property from MPP_Admin class
• Unused $options property from Multipage class
• Dead widget files: class-mpp-table-of-contents-widget.php and mpp-widgets.php (never loaded, non-functional)
• Dead mpp_uninstall() function in mpp-update.php (replaced by uninstall.php)
• Orphaned .toctogglespan CSS rule (toggle was removed from PHP)
• Dead mpp_get_default_options() function (never called, option keys used underscores instead of hyphens)
• Unused MPP__MINIMUM_WP_VERSION constant (minimum WP version already declared in plugin header)
• Redundant MPP__PLUGIN_DIR constant (same value as MPP_PLUGIN_DIR, only used once — inlined)

1.5.14

Fixed

• Uninitialized $custom_intro variable causing PHP 8.4 warnings (class-mpp.php)
• Array bounds check missing for $_mpp_page_keys access in mpp_pre_handle_404()
• Ambiguous operator precedence in comments display condition (added explicit parentheses)
• Integer settings sanitized with sanitize_text_field() instead of intval() in advanced settings
• Missing esc_attr() on <option> values in admin settings forms (4 occurrences)
• Options cache never invalidated after saving — mpp_clear_options_cache() now resets the static cache
• Deprecated current_time('timestamp') replaced with time() in mpp-update.php and admin-advanced-settings.php
• Loose == / != comparisons replaced with === / !== across all PHP files
• array_search() without false check in TinyMCE button insertion (class-mpp-admin.php)
• Operator precedence ambiguity in TOC active page condition (mpp-template.php)
• Preview link parameters now properly sanitized with intval() / sanitize_text_field() (mpp-template.php)
• Incorrect @since 1.9.0 docblock tags corrected to 1.4

Added

• LICENSE file (GPL v3 full text)
• CONTRIBUTING.md with coding standards, project structure, and contribution guidelines
• ARCHITECTURE.md describing the plugin file structure and data flow

Changed

• Replaced &$this with $this in all callback arrays (unnecessary since PHP 5.4)
• Updated Codex link to developer.wordpress.org in advanced settings
• Extracted content parser into Multipage_Parser class (inc/mpp-parser.php) from the main Multipage class

Removed

• Dead debug code in table of contents widget
• Unused admin-premium.php page placeholder
• Dead is_gutenberg_page() method in class-mpp.php (replaced by mpp_is_block_editor_active())

1.5.13

Fixed

• Quotes in subpage titles (e.g. "F48") breaking page parsing
• PHP 8.2+ deprecated dynamic property warnings
• Catastrophic backtracking in regex patterns
• Page 2+ not accessible due to redirect_canonical interference
• Improperly quoted rel attribute in navigation links
• "Advaced" typo in admin submenu registration

Added

• SEO rel=prev / rel=next links in <head> for multipage posts
• Input sanitization and escaping across admin settings
• In-memory options caching to reduce database queries
• README.md with badges, requirements, and usage documentation
• CHANGELOG.md following Keep a Changelog format

Changed

• Replaced $_REQUEST with explicit $_GET / $_POST checks
• Updated minimum WordPress version to 5.0
• Tested with PHP 8.4
• Regenerated .pot translation template (73 strings)
• Default branch renamed from master to main

Removed

• Dead code, unused premium references, Italian comments
• readme.txt (replaced by README.md)

Full changelog: CHANGELOG.md