Does 3.6 have major enough update to break things?

I am afraid to update to 3.6 as it might break things and it will be a pain to switch back. Is there major core changes that might end up breaking things like removal of major functions etc. Its not worth it for me to update if it ruins my site. Any major multisite changes I should worry about? Thanks for the intel. - Brashell

  • mindset

    Highlights

    New Default Theme - Twenty Thirteen
    Focus on blogging
    Single column layout with Sidebar / Widgets in the footer
    Latest Theme Features support, particularly Post Formats
    Font-based icons (Genericons)

    Admin Enhancements
    Menus UI improvements
    Revisions revised to be more dynamic and scalable
    Autosave and Post Locking
    Preview Audio and Video on Media Edit Screen
    In-line login following expired sessions

    For Developers
    External Libraries have been updated. More Info
    New audio/video APIs give developers access to powerful media metadata, like ID3 tags.
    Filters for revisions, allowing you to set the number of revisions ad hoc instead of only via a define. More Info
    Semantic Markup allows themes to choose improved HTML5 markup for comment forms, search forms, and comment lists.
    Search content for shortcodes with has_shortcode() and adjust shortcode attributes with a new filter.

    What's New
    General

    Use digraphs for German umlauts in remove_accents()
    Use Ellipses instead of …
    Consistently apply 'register' filter
    Automatically esc_url() the URL echoed by the_permalink()
    Allow developers to specify an Accept-Encoding header in WP_Http::accept_encoding()
    Pass tag object and args array to topic_count_text_callback from wp_generate_tag_cloud()
    Use wp_unslash() instead of stripslashes_deep
    Improve the performance of backslashit() by avoiding regular expressions
    Disallow accidental or negligent deregistering of critical scripts in the admin. Covers jQuery, jQuery UI, Underscore, and Backbone
    Remove the_title_attribute() from anchors with the_title() as text
    Display username (user_login) rather than user_nicename in Toolbar below username

    Posts

    The Revision Management UI saw significant improvement
    Shortcode attributes can now be filtered via shortcode_atts_$shortcode hook
    The ability to change post formats was removed from Quick Edit
    A 'not_found' label was added for non-hierarchical taxonomys
    Better UX for dealing with multiple users editing the same content (aka Post Locking)
    Audio/Video support More Info

    Media

    Add oEmbed support for Rdio and Spotify
    .webm (video/webm) was added to the MIME types list
    The Media Library can now be sorted by Author name
    Bug fixed where initial gallery link-to setting wasn't applied
    Return from image_downsize() earlier if a custom resize function is used
    Orientation information was added to items in gallery_shortcode()
    New Audio and Video previews are available on the Media > Edit Screen
    Added wp_audio_shortcode() and wp_video_shortcode()

    Comments

    Improve wp_list_comments() markup
    Add the ability to use HTML5 input types in the comment form

    Appearance

    The Navigation Menus UI got a significant refresh
    The Customizer can now be accessed via the Appearance menu
    Screen options can now be added to the Appearance > Widgets Screen

    Plugins

    Prevent plugins from overriding jQuery in the admin
    Prevent plugins with certain filenames from breaking links in the admin menu

    Users

    Remove the three default contact methods (AIM, YIM, Jabber) for new installs.
    Pass old roles to set_user_role action
    The workflow for deleting users has been improved

    Settings

    Allow any post format to be set as default in Settings > Writing Screen

    Accessibility

    Better keyboard/screen reader accessibility in the Nav Menus UI
    Background image's "select a file" link works with keyboard navigation

    Under The Hood
    General

    Use official MIME types for Windows Media file extensions
    Redirect after save on options-permalink.php to ensure permalinks are fully flushed
    Only show database errors if both WP_DEBUG and WP_DEBUG_DISPLAY are enabled

    Bug Fixes

    Strip slashes from passwords sent to new users by email
    Make sure the url returned by post_preview() is filterable with preview_post_link
    Fix handling of '0' as meta_value argument in get_pages()
    Correctly print 'after' data when scripts are concatenated in WP_Styles class
    Properly truncate UTF-8 post slugs in wp_unique_post_slug()
    Avoid PHP notices in Media Library if an attachment parent does not exist
    Fix some tabbing issues on the post editing screen
    Avoid notice by checking for user agent in wp_new_comment()
    Avoid notice in parent_dropdown() by checking if post exists before testing post id
    Prevent an unintended visibility change from "Password protected" to "Public" when updating the post
    Avoid a warning in mb_internal_encoding by making sure we have a charset first
    Fix unnecessarily persistent "pending email change" admin message
    Ensure we strictly compare 'all options' and 'not options' when protecting these special options
    Make sure to reset the modal after gallery insertion
    Add sanity checks on image metadata to avoid warnings
    Avoid an undefined index notice in get_post_type_archive_feed_link()
    Avoid notices when array args are missing in WP_Image_Editor::multi_resize()
    Fix notice in wp_generate_attachment_metadata()
    Avoid PHP notices when deleting or restoring an item that no longer exists

    Multisite

    Pass blog_id to the wpmu_drop_tables filter

    Classes

    XML-RPC: Return an error for getRecentPosts (mw and blogger) if the user does not have edit_posts
    XML-RPC: Standardize home/site url labels with core labels
    Preserve alpha in WP_Image_Editor_GD when images are not resized
    Make sure WP_Http funnels all redirect requests through WP_Http::request() to ensure the proper transport is used

    Functions

    An arg parameter was added for wp_nonce_url()
    Allow paths with two consecutive dots to be passed to home_url() and all related *_url() functions
    Document 7th parameter, $callback_args in add_meta_box()
    Confirm a user exists before deleting them in wp_delete_user() and wpmu_delete_user()
    Return WP_Error from wp_crop_image() if saving has failed
    Bail early with correct WP_Error if invalid post ID passed to wp_insert_post()
    Remove duplicate calls to add_new_user_to_blog()
    Introduce wp_add_id3_tag_data()
    Introduce wp_read_video_metadata()
    Introduce wp_read_audio_metadata()
    Introduce wp_nav_menu_disabled_check()
    Introduce wp_nav_menu_update_menu_items()
    Introduce do_accordion_sections()
    Introduce wp_slash()
    Introduce wp_unslash()
    Introduce wp_is_writable()
    Introduce wp_auth_check_load()
    Introduce wp_auth_check()
    Introduce get_tag_regex()
    Introduce wp_registration_url()
    Introduce wp_heartbeat_settings()
    Introduce wp_mediaelement_fallback()
    Introduce wp_get_audio_extensions()
    Introduce wp_audio_shortcode()
    Introduce wp_get_video_extensions()
    Introduce wp_video_shortcode()
    Introduce wp_embed_handler_audio()
    Introduce wp_embed_handler_video()
    Introduce get_attached_media()
    Introduce get_post_galleries()
    Introduce get_post_galleries_images()
    Introduce get_post_gallery()
    Introduce get_post_gallery_images()
    Introduce wp_post_revision_title_expanded()
    Introduce paginate_content()
    Introduce get_paged_content()
    Introduce wp_revisions_enabled()
    Introduce wp_revisions_to_keep()
    Introduce wp_text_diff_with_count()
    Introduce shortcode_exists()
    Introduce has_shortcode()
    Introduce wp_parse_post_content()
    Introduce wp_remove_object_terms()
    Introduce wp_add_object_terms()

    Filters

    Add self_link in self_link()
    Add get_comments_link in get_comments_link()
    Add comments_link_feed in comments_link_feed()
    Add comment_link in get_comment_link()
    Add nav_menu_link_attributes in Walker_Nav_Menu::start_el()
    Add wp_revisions_to_keep in wp_revisions_to_keep()
    Add wp_link_pages in wp_link_pages()
    Add search_form_format in get_search_form()
    Add user_search_columns in WP_User_Query::prepare_query()
    Add wp_http_accept_encoding in WP_Http_Encoding::accept_encoding()
    Add widget_meta_poweredby in WP_Widget_Meta::widget()

  • aristath

    Hello there @Brashell, I hope you're well today!

    Everytime WordPress gets updates, lots of small things change under the hood.
    They always pay great attention to backwards compatibility and not breaking stuff, but there's always a small chance of minor incompatibilities.
    Most plugins shouldn't have any issues.
    My recommendation would be to wait a week before updating.
    In that time most plugin developers should update their plugins if there are any inconsistencies.
    WPMU-DEV plugins are being tested as we speak and any conflicts are always fixed within 24-48 hours of WordPress releases.

    I hope that helps!

    Cheers,
    Ari.

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