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On April 12, 2016, WordPress [[Version 4.5]], named for jazz musician Coleman Hawkins, was released to the public. For more information on this enhancement and bug-fix release, read the [https://wordpress.org/news/2016/04/coleman/ WordPress Blog], and see the [[Changelog/4.5|Changelog for 4.5]].

For [[Version 4.5]], the database version ('''db_version''' in '''wp_options''') changed to 36686, and the [https://core.trac.wordpress.org Trac] revision was 37181.

* [https://trac.wordpress.org/query?status=closed&milestone=4.5 View Closed Tickets]

==Highlights==
===The Finer Points===

;Customizer Improvement: Device Previewer Buttons in the customizer controls footer shows how your site looks in mobile, tablet, and desktop contexts before making changes to its appearance. Theme installer previewer has the same function.

[[Image:device-preview.jpg||Device Preview for Desktop, Tablet and Mobile, and Devie Preview Buttons]]

:Customizer provides theme logo upload and adding feature. The latest WordPress official themes such as [[Twenty Sixteen]] utilize this feature.

[[Image:theme-logo-support.jpg|500px|Theme Logo Support]]

;Visual Editor Improvement: Inline Link Editing enables users to direct URL input without switching to modal dialog. [[Version 4.5]] adds new shortcuts in Visual Editor.
:*Use <tt>`your code`</tt> to transform <tt>&lt;code>my code&lt;/code></tt>
:*Use <tt>---</tt> to transform <tt>&lt;hr /></tt>

[[Image:inline-link-editing.jpg||Inline Link Editing]]

;Comment Refinement: Refreshed Moderate Comment Screen has formatted comment content for display, navigation via a text link, updated message styles and so on. The comment form now enforce the maximum length of each field.

[[Image:moderate_comment_v4.5.png|500px|Moderate Comment Screen]]

;Optimization of Image Generation: Image sizes are generated more efficiently and remove unneeded meta, while still including color profiles in Imagick, for reduced sizes of up to 50% with near identical visual quality.

===For Developers===

* '''Selective Refresh''' - A comprehensive framework for rendering parts of the customizer preview in real time. The same framework is used in Theme Install Preview.
* '''Backbone and Underscore update''' - Backbone is upgraded from 1.1.2 to 1.2.3 and Underscore is upgraded from 1.6.0 to 1.8.3.
* '''Embed templates''' - Embed templates were split into parts and can now be directly overridden by themes via the template hierarchy.
** <tt>embed-{post-type}-{post_format}.php</tt>
** <tt>embed-{post-type}.php</tt>
** <tt>embed.php</tt>
** <tt>wp-includes/theme-compat/embed.php</tt>
* '''Term Edit Page changes''' - <tt>wp-admin/term.php</tt> was introduced.

==What's New==
===Security===
In addition to the new features, enhancements, and bug-fixes, WordPress 4.5 solves a few security problems:

* SSRF Bypass using Octal & Hexedecimal IP addresses, reported by Yu Wang & Tong Shi from [http://xteam.baidu.com BAIDU XTeam]
* Reflected XSS on the network settings page, reported by [https://twitter.com/e3amn2l Emanuel Bronshtein (@e3amn2l)]
* Script compression option CSRF, reported by [https://www.linkedin.com/in/ronni-skansing-36143b65 Ronni Skansing]

We thank them for [https://make.wordpress.org/core/handbook/testing/reporting-security-vulnerabilities/ disclosing the issues responsibly].

===Posts===
* '''Inline Link Editing''' ([https://core.trac.wordpress.org/ticket/33301 #33301]) – Within the visual editor, edit links inline for a smoother workflow. When the users type in the URL field, it uses jQuery UI Autocomplete to search for local posts and pages.
* '''Additional Editor Shortcuts''' ([https://core.trac.wordpress.org/ticket/33300 #33300]) – Includes a few new shortcuts, like <tt>`..`</tt> for code and <tt>---</tt> for horizontal bar. In the future release, we may include bold or italic shortcuts.

===Comments===
[[Version 4.5]] includes several bug fixes and enhancements in the Comments component.

*'''Moderate Comment Screen Refresh''' ([https://core.trac.wordpress.org/ticket/34133 #34133]) – Moderate Comment Screen is where you land when clicking one of the moderation actions from a comment notification email message.
** Comment content is formatted for display, instead of one massive block of escaped text
** Include navigation via a text link to the Edit Comment screen at the bottom of the comment
** Updated message styles that match other screens
** Only wrap the comment date in a link if the comment permalink exists to avoid confusion
** Appended <tt>#wpbody-content</tt> to the comment email message links for accessibility

*'''Max Lengths for Comment Form Fields''' ([https://core.trac.wordpress.org/ticket/10377 #10377]) - The comment form will now enforce the maximum length of each field’s respective database column. The default length settings are as follows:
** Comment: 65525 characters
** Name : 245 characters
** Email: 100 characters
** Url: 200 characters

*'''Comment Error Page Navigation''' ([https://core.trac.wordpress.org/ticket/4332 #4332]) - A simple back link has been added to the bottom of the error message page

===Appearance===

Customizer includes many new features:
* '''Responsive Preview of your site''' ([https://core.trac.wordpress.org/ticket/31195 #31195]) - See how your site looks in mobile, tablet, and desktop contexts before making changes to its appearance. The device previewer is in the customizer controls footer, near the "Collapse" button.
* '''Theme Logo Support''' ([https://core.trac.wordpress.org/ticket/33755 #33755]) - Native support for a theme logo within the Customizer.
* '''Selective Refresh''' - A comprehensive framework can render parts of the customizer preview such as site title and tagline in core themes in real time. No more entire preview screen reload happens.
* '''Easy of use''' - Shift-click on nav menu items in preview to open corresponding control in Customizer pane.

The device preview buttons of customizer were brought to the theme-install previewer so that themes can be easily previewed on various device sizes before being installed. ([https://core.trac.wordpress.org/ticket/36017 #36017])

===Install Process===

* [[Version 4.5]] default to generating secret keys and salts locally instead of relying on the WordPress.org API. ([https://core.trac.wordpress.org/ticket/35290 #35290])

==Under The Hood==

=== General ===

* Selective Refresh ([https://core.trac.wordpress.org/ticket/27355 #27355]) – A comprehensive framework for rendering parts of the customizer preview in real time. Theme and plugin authors should test their widgets specifically for compatibility with selective refresh.
* Backbone and Underscore updated to latest versions ([https://core.trac.wordpress.org/ticket/34350 #34350]) – Backbone is upgraded from 1.1.2 to 1.2.3 and Underscore is upgraded from 1.6.0 to 1.8.3. See the [https://make.wordpress.org/core/2016/02/17/backbone-and-underscore-updated-to-latest-versions/ this post] for important changes.
* Embed templates ([https://core.trac.wordpress.org/ticket/34561 #34561]) – Embed templates were split into parts and can now be directly overridden by themes via the template hierarchy.
* Script loader ([https://core.trac.wordpress.org/ticket/14853 #14853], [https://core.trac.wordpress.org/ticket/35873 #35873]) – Introduces wp_add_inline_script() for including inline JavaScript just like wp_add_inline_style() works for CSS.
* Changes to the Term Edit Page ([https://core.trac.wordpress.org/ticket/34988 #34988]) - <tt>wp-admin/term.php</tt> was introduced. The links to edit a single term now look like <tt>example.com/wp-admin/term.php?tag_ID=123</tt>. (previously: <tt>example.com/wp-admin/edit-tags.php?action=edit&taxonomy=post_tag&tag_ID=127</tt>).
* Allow rewrite rules to work in nested WordPress installations on IIS ([https://core.trac.wordpress.org/ticket/35558 #35558])
* For Emoji, upgraded twemoji.js to version 2 ([https://core.trac.wordpress.org/ticket/36059 #36059]) and added extra IE11 compatibility ([https://core.trac.wordpress.org/ticket/35977 #35977])

=== Images ===
[[Version 4.5]] includes some performance enhancements for images.
* Increased image compression for custom sizes
* Improved resizing settings for ImageMagick
* Introduction of <tt>wp_get_upload_dir()</tt> ([https://core.trac.wordpress.org/ticket/34359 #34359])

Also includes
* Imagick support in HHVM ([https://core.trac.wordpress.org/ticket/35973 #35973])
* Fixes for SSL with Responsive Images ([https://core.trac.wordpress.org/ticket/34945 #34945])

=== Embeds ===
After the introduction of the embeds feature in [[Version 4.4]] there have been a few significant changes in [[Version 4.5]] to make embeds more robust and easier to customize.
* Embed Code Adjustments ([https://core.trac.wordpress.org/ticket/35804 #35804], [https://core.trac.wordpress.org/ticket/35894 #35894])
* Discovery Improvements ([https://core.trac.wordpress.org/ticket/35979 #35979])
* Embedding Static Front Pages ([https://core.trac.wordpress.org/ticket/34971 #34971])
* Embed Template Changes ([https://core.trac.wordpress.org/ticket/35322 #35322], [https://core.trac.wordpress.org/ticket/35630 #35630], [https://core.trac.wordpress.org/ticket/34561 #34561])
* Embeds in the Template Hierarchy ([https://core.trac.wordpress.org/ticket/34278 #34278]) - Themes can now implement embed templates for specific post types and post formats within the confines of the template hierarchy. The embeds template cascade looks like this:
** <tt>embed-{post-type}-{post_format}.php</tt> – First, WordPress looks for a template for the specific post. For example, if its post type is product and it has the audio format, WordPress would look for embed-product-audio.php.
** <tt>embed-{post-type}.php</tt> – If the post type is car, WordPress would look for embed-car.php.
** <tt>embed.php</tt> – WordPress then falls back to embed.php.
** Finally, WordPress ultimately falls back to <tt>wp-includes/theme-compat/embed.php</tt>

* Add oEmbed support for moments and timelines from Twitter ([https://core.trac.wordpress.org/ticket/36197 #36197])

=== Script Loader ===
[[Version 4.5]] enhanced the script loader and script/style dependencies.

* Individual stylesheets instead of <tt>wp-admin.min.css</tt> ([https://core.trac.wordpress.org/ticket/35229 #35229])
* HTTP ETag header for <tt>load-scripts.php</tt> and <tt>load-styles.php</tt> ([https://core.trac.wordpress.org/ticket/28722 #28722])
* <tt>wp_add_inline_script()</tt> ([https://core.trac.wordpress.org/ticket/14853 #14853])
* Scripts/Styles with "alias" handles ([https://core.trac.wordpress.org/ticket/35643 #35643], [https://core.trac.wordpress.org/ticket/25247 #25247], [https://core.trac.wordpress.org/ticket/35229 #35229])
* Support for scripts with dependencies in different groups ([https://core.trac.wordpress.org/ticket/35873 #35873])

=== Bug Fixes ===
* Support Windows shares/DFS roots in <tt>wp_normalize_path()</tt> ([https://core.trac.wordpress.org/ticket/35996 #35996])
* OPTIONS request to REST API does not return correct Accept header ([https://core.trac.wordpress.org/ticket/35975 #35975]])

=== Multisite ===
* New WP_Site class ([https://core.trac.wordpress.org/ticket/32450 #32450]) – More object-oriented approach for managing sites in Multisite.


=== Classes ===

==== What's New ====
* [https://developer.wordpress.org/reference/classes/wp_upgrader/create_lock WP_Upgrader::create_lock()]
* [https://developer.wordpress.org/reference/classes/wp_upgrader/release_lock WP_Upgrader::release_lock()]

* [https://developer.wordpress.org/reference/classes/wp_customize_manager/get_nonces WP_Customize_Manager::get_nonces()]
* [https://developer.wordpress.org/reference/classes/wp_customize_manager/get_previewable_devices WP_Customize_Manager::get_previewable_devices()]
* [https://developer.wordpress.org/reference/classes/wp_customize_manager/_render_custom_logo_partial WP_Customize_Manager::_render_custom_logo_partial()]

* [https://developer.wordpress.org/reference/classes/wp_customize_nav_menus/filter_nonces WP_Customize_Nav_Menus::filter_nonces()]
* [https://developer.wordpress.org/reference/classes/wp_customize_nav_menus/customize_dynamic_partial_args WP_Customize_Nav_Menus::customize_dynamic_partial_args()]
* [https://developer.wordpress.org/reference/classes/wp_customize_nav_menus/export_partial_rendered_nav_menu_instances WP_Customize_Nav_Menus::export_partial_rendered_nav_menu_instances()]

* [https://developer.wordpress.org/reference/classes/wp_customize_widgets/get_selective_refreshable_widgets WP_Customize_Widgets::get_selective_refreshable_widgets()]
* [https://developer.wordpress.org/reference/classes/wp_customize_widgets/is_widget_selective_refreshable WP_Customize_Widgets::is_widget_selective_refreshable()]
* [https://developer.wordpress.org/reference/classes/wp_customize_widgets/customize_dynamic_partial_args WP_Customize_Widgets::customize_dynamic_partial_args()]
* [https://developer.wordpress.org/reference/classes/wp_customize_widgets/selective_refresh_init/ WP_Customize_Widgets::selective_refresh_init()]
* [https://developer.wordpress.org/reference/classes/wp_customize_widgets/filter_wp_kses_allowed_data_attributes WP_Customize_Widgets::filter_wp_kses_allowed_data_attributes()]
* [https://developer.wordpress.org/reference/classes/wp_customize_widgets/start_dynamic_sidebar WP_Customize_Widgets::start_dynamic_sidebar()]
* [https://developer.wordpress.org/reference/classes/wp_customize_widgets/end_dynamic_sidebar WP_Customize_Widgets::end_dynamic_sidebar()]
* [https://developer.wordpress.org/reference/classes/wp_customize_widgets/filter_sidebars_widgets_for_rendering_widget WP_Customize_Widgets::filter_sidebars_widgets_for_rendering_widget()]
* [https://developer.wordpress.org/reference/classes/wp_customize_widgets/render_widget_partial WP_Customize_Widgets::render_widget_partial()]

* [https://developer.wordpress.org/reference/classes/wp_image_editor_imagick/thumbnail_image WP_Image_Editor_Imagick::thumbnail_image()]
* [https://developer.wordpress.org/reference/classes/wp_image_editor_imagick/strip_meta WP_Image_Editor_Imagick::strip_meta()]

* [https://developer.wordpress.org/reference/classes/wp_metadata_lazyloader WP_Metadata_Lazyloader]

* [https://developer.wordpress.org/reference/classes/wp_rewrite/remove_rewrite_tag WP_Rewrite::remove_rewrite_tag()]
* [https://developer.wordpress.org/reference/classes/wp_rewrite/remove_permastruct WP_Rewrite::remove_permastruct()]

* [https://developer.wordpress.org/reference/classes/wp_site WP_Site]

* [https://developer.wordpress.org/reference/classes/wp/remove_query_var WP::remove_query_var()]

* [https://developer.wordpress.org/reference/classes/wp_scripts/add_inline_script WP_Scripts::add_inline_script()]
* [https://developer.wordpress.org/reference/classes/wp_scripts/print_inline_script WP_Scripts::print_inline_script()]

* [https://developer.wordpress.org/reference/classes/wpdb/close wpdb::close()]

* [https://developer.wordpress.org/reference/classes/wp_customize_partial WP_Customize_Partial]

* [https://developer.wordpress.org/reference/classes/wp_customize_selective_refresh WP_Customize_Selective_Refresh]

* [https://developer.wordpress.org/reference/classes/wp_customize_site_icon_control/content_template WP_Customize_Site_Icon_Control::content_template()]

* [https://developer.wordpress.org/reference/classes/wp_rest_request/from_url WP_REST_Request::from_url()]

* [https://developer.wordpress.org/reference/classeswp_rest_response/get_curies WP_REST_Response::get_curies()]

* [https://developer.wordpress.org/reference/classes/wp_rest_server/get_compact_response_links WP_REST_Server::get_compact_response_links()]

==== Deprecated ====
* [https://developer.wordpress.org/reference/classes/wp_query/is_comments_popup WP_Query::is_comments_popup()]

* [https://developer.wordpress.org/reference/classes/wp_customize_nav_menus_panel/wp_nav_menu_manage_columns WP_Customize_Nav_Menus_Panel::wp_nav_menu_manage_columns()]

=== Functions ===


==== What's New ====
* [https://developer.wordpress.org/reference/functions/wp_queue_comments_for_comment_meta_lazyload wp_queue_comments_for_comment_meta_lazyload()]
* [https://developer.wordpress.org/reference/functions/wp_get_comment_fields_max_lengths wp_get_comment_fields_max_lengths()]
* [https://developer.wordpress.org/reference/functions/the_embed_site_title the_embed_site_title()]
* [https://developer.wordpress.org/reference/functions/wp_get_raw_referer wp_get_raw_referer()]
* [https://developer.wordpress.org/reference/functions/wp_get_upload_dir wp_get_upload_dir()]
* [https://developer.wordpress.org/reference/functions/wp_add_inline_script wp_add_inline_script()]
* [https://developer.wordpress.org/reference/functions/has_custom_logo has_custom_logo()]
* [https://developer.wordpress.org/reference/functions/get_custom_logo get_custom_logo()]
* [https://developer.wordpress.org/reference/functions/the_custom_logo the_custom_logo()]
* [https://developer.wordpress.org/reference/functions/wp_metadata_lazyloader wp_metadata_lazyloader()]
* [https://developer.wordpress.org/reference/functions/unregister_post_type unregister_post_type()]
* [https://developer.wordpress.org/reference/functions/get_post_types_by_support get_post_types_by_support()]
* [https://developer.wordpress.org/reference/functions/wp_queue_posts_for_term_meta_lazyload wp_queue_posts_for_term_meta_lazyload()]
* [https://developer.wordpress.org/reference/functions/wp_add_trashed_suffix_to_post_name_for_trashed_posts wp_add_trashed_suffix_to_post_name_for_trashed_posts()]
* [https://developer.wordpress.org/reference/functions/wp_add_trashed_suffix_to_post_name_for_post wp_add_trashed_suffix_to_post_name_for_post()]
* [https://developer.wordpress.org/reference/functions/rest_get_server rest_get_server()]
* [https://developer.wordpress.org/reference/functions/_wp_post_revision_data _wp_post_revision_data()]
* [https://developer.wordpress.org/reference/functions/remove_rewrite_tag remove_rewrite_tag()]
* [https://developer.wordpress.org/reference/functions/remove_permastruct remove_permastruct()]
* [https://developer.wordpress.org/reference/functions/unregister_taxonomy unregister_taxonomy()]
* [https://developer.wordpress.org/reference/functions/get_embed_template get_embed_template()]
* [https://developer.wordpress.org/reference/functions/_custom_logo_header_styles _custom_logo_header_styles()]
* [https://developer.wordpress.org/reference/functions/wp_authenticate_email_password wp_authenticate_email_password()]
* [https://developer.wordpress.org/reference/functions/_wp_get_current_user _wp_get_current_user()]

==== Deprecated ====
* [https://developer.wordpress.org/reference/functions/add_object_page add_object_page()]
* [https://developer.wordpress.org/reference/functions/add_utility_page add_utility_page()]
* [https://developer.wordpress.org/reference/functions/get_comments_popup_template get_comments_popup_template()]
* [https://developer.wordpress.org/reference/functions/is_comments_popup is_comments_popup()]
* [https://developer.wordpress.org/reference/functions/comments_popup_script comments_popup_script()]
* [https://developer.wordpress.org/reference/functions/popuplinks popuplinks()]
* <tt>_wp_upload_dir_baseurl()</tt>
* [https://developer.wordpress.org/reference/functions/get_currentuserinfo get_currentuserinfo()]

=== Actions & Filters ===

==== New Actions ====
* [https://developer.wordpress.org/reference/hooks/taxonomy_term_edit_form_top/ {taxonomy}_term_edit_form_top]
* [https://developer.wordpress.org/reference/hooks/pre_uninstall_plugin pre_uninstall_plugin]
* [https://developer.wordpress.org/reference/hooks/pre_network_site_new_created_user pre_network_site_new_created_user]
* [https://developer.wordpress.org/reference/hooks/network_site_new_form network_site_new_form]
* [https://developer.wordpress.org/reference/hooks/network_user_new_form network_user_new_form]
* [https://developer.wordpress.org/reference/hooks/clean_comment_cache clean_comment_cache]
* [https://developer.wordpress.org/reference/hooks/unregistered_post_type unregistered_post_type]
* [https://developer.wordpress.org/reference/hooks/unregistered_taxonomy unregistered_taxonomy]

==== New Filters ====
* [https://developer.wordpress.org/reference/hooks/press_this_save_post press_this_save_post]
* [https://developer.wordpress.org/reference/hooks/customize_previewable_devices customize_previewable_devices]
* [https://developer.wordpress.org/reference/hooks/customize_nav_menu_searched_items customize_nav_menu_searched_items]
* [https://developer.wordpress.org/reference/hooks/image_strip_meta image_strip_meta]
* [https://developer.wordpress.org/reference/hooks/network_allowed_themes network_allowed_themes]
* [https://developer.wordpress.org/reference/hooks/site_allowed_themes site_allowed_themes]
* [https://developer.wordpress.org/reference/hooks/pre_handle_404 pre_handle_404]
* [https://developer.wordpress.org/reference/hooks/comments_template_query_args comments_template_query_args]
* [https://developer.wordpress.org/reference/hooks/wp_get_comment_fields_max_lengths wp_get_comment_fields_max_lengths]
* [https://developer.wordpress.org/reference/hooks/pre_wp_update_comment_count_now pre_wp_update_comment_count_now]
* [https://developer.wordpress.org/reference/hooks/wp_unique_filename wp_unique_filename]
* [https://developer.wordpress.org/reference/hooks/get_custom_logo get_custom_logo]
* [https://developer.wordpress.org/reference/hooks/rest_request_from_url rest_request_from_url]
* [https://developer.wordpress.org/reference/hooks/rest_response_link_curies rest_response_link_curies]

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