From 3.x to 4.0

Contents

Composer
Javascript
Notifications
Split OkResponse, ErrorResponse and RedirectResponse
Datamodel
Plugin development
Plugins
Type hinted functions
Change in function parameters
Renamed hook/event handler callbacks
Reworked exceptions
Reworked Traits
Miscellaneous API changes
Deprecated APIs
Removed functions
Removed views / resources
Removed hooks / events
Removed actions

Composer 

PHP Requirements

To be compatible with PHP 8 we needed to increase the minimal PHP version to 7.4. PHP versions < 7.4 are already end-of-life.

Composer project

The root of the composer project is no longer handled as a semi functional plugin. Languages from the languages directory are nog longer imported, the views from the views directory are no longer registered, the PHP DI services from the elgg-services.php are no longer registered and the start.php file is no longer included.

If you needed specific modification to your Elgg installation you need to make a plugin and ensure that the plugin is the latest in the plugin order to allow you to overrule everything you needed to change.

Doctrine DBAL

Elgg replaced v2 with v3 of the doctrine/dbal dependency. On of the most notable changes is that if you work with QueryBuilders and use the $qb->fetch() function you will no longer get an object, but an array. If you want your rows to be useable as classes, you can use elgg()->db->getData($qb). Another important change is that if you provide your own query parameters, you should no longer prefix keys with a colon in the parameters but still do so in the query.

PHP-DI

This feature has been updated to use the latest version of PHP-DI. Most notable breaking change for Elgg is the need to change your plugin service definition to use \DI\create() instead of \DI\object().

ZendMail replaced by LaminasMail

Because of the deprecation of the Zend\Mail library and it’s replacement by the Laminas\Mail all references have been updated.

Removed composer dependencies

bower-asset/jquery-treeview the related js and css are no longer available in the system
bower-asset/jquery.imgareaselect the related js and css are no longer available in the system
npm-asset/formdata-polyfill all modern browser have support, no longer a need for a polyfill
npm-asset/jquery-form use native FormData functionality
npm-asset/weakmap-polyfill all modern browser have support, no longer a need for a polyfill
simpletest/simpletest

Javascript 

AJAX

The following Ajax helper functions have been removed in favor of their counterparts in asynchronous module elgg/Ajax. * elgg.action() * elgg.get() * elgg.getJSON() * elgg.post()

The ajax function elgg.api has been moved to the executeMethod function in the asynchronous module elgg/webservices in the webservices plugin. Other elgg.ajax functions and attributes have been removed from the system. Also the legacy handling of ajax calls have been removed from the system.

Classes

The javascript logic for automatically booting some javascript for your plugin and registering hooks via the Elgg/Plugin class has been removed from the system. This functionality was never used by core and hardly seen in plugins. Use AMD loaded javascript or extend elgg.js for always loaded javascript.

The ElggPriorityList javascript class has been removed from the system.

System Hooks

The AMD modules for elgg/init and elgg/ready have been removed. The init, system hook is still available but it only makes sense to rely on this hook from non-AMD loaded js libraries. The boot, system and ready, system triggers have been removed from the system. Replace with init, system for the same effect.

jQuery

The jQuery library has been updated to the latest version (v3.5.x). This is a major update from the version used in Elgg 3.x. For information about what is changed between these release you should take a look at the jQuery website.

jQuery UI

The jQuery UI library has been updated to v1.12.x. The library is no longer loaded in full by default. If you need to use features from the library you can require them in your own script. For example to be able to use the sortable functionality do the following:

require('jquery-ui/widgets/sortable');

// or in your own AMD script
define(['jquery-ui/widgets/sortable'], function() {
        // use the sortable
});

Miscellaneous JS changes

The AMD module elgg/widgets no longer returns an object and no longer requires you to call init on the module

Notifications 

Pre Elgg 1.9 notification handling has been removed. Related functions and hooks no longer exist.

Subscriptions

The relationship in the database which stores the subscription method for notifications has been changed from notifymethod to notify:method.

Multiple Recipients

An ElggEmail now supports multiple recipients in To, Cc and Bcc. The related getter functions like getTo() will now always return an array.

Settings

A generic storage for notification preferences has been introduced in \ElggUser::setNotificationSetting() and \ElggUser::getNotificationSettings(), the notification settings now have a ‘purpose’.

For example group_join can be used to manage the default subscription you get with a group when you join the group.

The Notifications plugin has generic handling of displaying and saving the settings. To display the setting extend the view notifications/settings/records (plural) with a view which uses notifications/settings/record (singular).

When requesting notification settings other than the default setting, if the user hasn’t saved a setting yet it’ll fall back to the default notification settings.

Management of the notification preferences for adding a new users to a friend collection has been removed.

Notification Salutation & Sign-off

To be able to have a more generic salutation and sign-off for outgoing mail notifications we have removed these texts from various translation strings and moved them to generic translations. This will mean you have to update your translations to reflect the new text and also check your code for uses of notifications where you provide your own salutation or sign-off text. You can find out more about this new behaviour in Notifications.

Notifications plugin

The Notifications plugin has been removed. All the features of the plugin are now part of Elgg core. Some pages (like the group notification settings) have been moved to the correct plugin.

This means that event handlers, hook handlers, actions, views and languages keys have been (re)moved or renamed.

Notification Event Handling

The notification hooks no longer receive the origin parameter.

Site notification

The site notifications plugin now shows the notification subject by default. If a site notification was created with the factory function SiteNotification::factory() more of the original notification information is stored with the site notification:

Notification subject is stored in title
Notification summary is stored in summary
Notification body is stored in description

Split OkResponse, ErrorResponse and RedirectResponse 

The classes Elgg\Http\ErrorResponse and Elgg\Http\RedirectResponse were extensions of Elgg\Http\OkReponse this complicated validating responses (for example in hooks). The classes have been split apart to allow for easier and clearer checks.

All classes now extend Elgg\Http\Response and implement Elgg\Http\ReponseBuilder. The default HTTP error code when using elgg_error_response() has been changed to return a 400 status.

Datamodel 

Schema changes

The access_id, owner_guid and enabled columns in the metadata table have been removed
The enabled column in the river table has been removed
The relationship column in the entity_relationships table now has a max length of 255 (up from 50)

ElggEntity attributes

Setting the type, subtype and enabled attributes of an ElggEntity is no longer possible using the magic setter. Changing the type is no longer possible, use the correct base class for your entity (eg. ElggObject, ElggGroup or ElggUser).

To change the subtype use the function setSubtype($subtype)

// this no longer works and throws an \Elgg\Exceptions\InvalidArgumentException
$object = new ElggObject();
$object->subtype = 'my_subtype';

// The correct use is
$object->setSubtype('my_subtype');

To change the enabled state of an entity use the correct functions

// this no longer works and throws an \Elgg\Exceptions\InvalidArgumentException
$object = new ElggObject();
$object->enabled = 'no';

// The correct use is
$object->enable(); // to enable
$object->disable(); // to disable

ElggUser attributes

Setting the admin and banned metadata of an ElggUser is no longer possible using the magic setter.

To change the admin state use the functions makeAdmin() and removeAdmin()

// this no longer works and throws an \Elgg\Exceptions\InvalidArgumentException
$user = new ElggUser()
$user->admin = 'yes';

// The correct use is
$user->makeAdmin(); // to give the admin role
$user->removeAdmin(); // to remove the admin role

To change the banned state use the functions ban() and unban()

// this no longer works and throws an \Elgg\Exceptions\InvalidArgumentException
$user = new ElggUser()
$user->banned = 'yes';

// The correct use is
$user->ban(); // to ban the user
$user->unban(); // to unban the user

Plugin development 

Plugin bootstrapping

The following files are no longer included during bootstrapping of a plugin:

activate.php use PluginBootstrap->activate()
deactivate.php use PluginBootstrap->deactivate()
views.php use elgg-plugin.php
start.php use elgg-plugin.php and/or PluginBootstrap

Plugin Manifest

The plugin manifest file is no longer used. Features of the manifest have been removed or moved to different locations.

It is no longer possible to require a specific php ini setting.

php version requirement -> composer require
php extension requirement -> composer require
plugin conflicts -> composer conflicts
plugin requirement -> elgg-plugin
plugin position requirement -> elgg-plugin
plugin version -> elgg-plugin
plugin activate on install -> elgg-plugin
plugin name -> elgg-plugin
plugin description -> composer.json
plugin categories -> composer.json
plugin license -> composer.json
plugin repo link -> composer.json
plugin issues link -> composer.json
plugin homepage link -> composer.json
plugin authors/contributors -> composer.json

Hookable field configurations

Some plugins had the option to configure entity fields in config. These features have been replaced by a central service that provides a mechanisme to request a hookable field config for a certain type/subtype.

You can request these configuration using the following code:

$fields = elgg()->fields->get('<entity_type>', '<entity_subtype');

The results will be an array with field configurations usable in elgg_view_field($field)

The following related functionality has been replaced by this new way:

The config for pages is no longer available in elgg_get_config('pages') use elgg()->fields->get('object', 'page')
The config for group is no longer available in elgg_get_config('group') use elgg()->fields->get('group', 'group')
The config for profile_fields is no longer available in elgg_get_config('profile_fields') use elgg()->fields->get('user', 'user')
Setting the config for pages, group and user:profile via elgg_set_config is no longer possible. Use a hook callback for fields, <entity_type>:<entity_subtype>.
The hook profile:fields, group has been replaced by the new hook fields, group:group
The hook profile:fields, user has been replaced by the new hook fields, user:user

Menus

Instead of registering the _elgg_setup_vertical_menu and _elgg_menu_transform_to_dropdown for menus, this is replaced by using the menu vars prepare_vertical and prepare_dropdown. Setting them to true will give you the same effect. This allows for individual control in views when this is required.

The automatic marking as ‘selected’ of parent menu items of the selected menu item will now always happen for every menu.

Filter tabs

The preparation of tabs for the filter menu by using the elgg_get_filter_tabs() function and the 'filter_tabs', '<context>' hook has been removed. You can now use the 'register', 'menu:filter:filter' hook to add/remove items from the same place.

The all, mine and friends tabs will automaticly generate if routes are available for pages similar to the current route. For example if the current route is collection:object:blog:all the tabs will be generated for the route collection:object:blog:owner and collection:object:blog:friends.

Title menu

The title menu will now be populated with the entity menu if the entity is provided to the layout. This is mostly useful on the detail page of an entity (eg. blog/view). Most of the entries for the entity menu will be added to a dropdown menu, except the edit menu item (when available) this item will be presented next to the dropdown menu.

echo elgg_view_page('title', [
        'content' => elgg_view_entity($entity),
        'entity' => $entity, // <= will make sure the entity menu is available in the title menu
]);

Registering tag metadatanames

Because of various limitations of this implementation it has been removed from the system. The following related API functions have been removed:

elgg_get_registered_tag_metadata_names()
elgg_register_tag_metadata_name()
elgg_unregister_tag_metadata_name()

If you need specific fields to be searchable you need to register them with the related search:fields hooks. The related tagnames:xxx tag language keys are no longer registered in the system.

The function ElggEntity::getTags() will now return only tag metadata with the name tags by default. If you want to check extra fields containing tags, you need to request this specifically.

Default widgets

The magic handling the creation of default widgets has been reduced. You now need to register the Elgg\Widgets\CreateDefaultWidgetsHandler callback to the event when you want default widgets to be created. The configuration default_widget_info is no longer present in the system. Use the get_list, default_widgets hook to get the value.

You also need to update the data in your get_list, default_widgets hook handler to return event_name (previously event) and event_type.

Container permissions

The function parameters for ElggEntity::canWriteToContainer() now require a $type and $subtype to be passed. This is to give more information to the resulting hook in order to be able to determine if a user is allowed write access to the container.

Plugins 

Activity plugin

This plugin received a much needed rewrite. The different pages (all/owner/friends) now have their own resource and listing views.

Diagnostics Plugin

This plugin has been removed, but the action to generate a report is still available. You can find it on the Information/Server admin page.

Discussions Plugin

This plugin no longer adds a tab to the filter menu on the groups pages
The discussions site menu item is now always present

Search Plugin

The output of search results no longer uses the helper class Elgg\Search\Formatter for the preparation of the result contents. This logic has been moved entirely into views.

The related functions prepareEntity and getSearchView in the Elgg\Search\Service class have been removed.

The hook search:format, entity has been removed.

Web services Plugin

The Web Services plugin received a complete rewrite, this is mostly related to the internals of the plugin.

Removed classes

ElggHMACCache has been replaced by _elgg_services()->hmacCacheTable (for internal use only)
Elgg\Notifications\Event has been replaced by Elgg\Notifications\SubscriptionNotificationEvent

Removed functions

create_api_user() has been replaced by _elgg_services()->apiUsersTable->createApiUser()
create_user_token() has been replaced by _elgg_services()->usersApiSessions->createToken()
get_api_user() has been replaced by _elgg_services()->apiUsersTable->getApiUser()
get_standard_api_key_array() use \Elgg\WebServices\ElggApiClient::setApiKeys()
get_user_tokens() has been replaced by _elgg_services()->usersApiSessions->getUserTokens()
pam_auth_session()
remove_api_user() has been replaced by _elgg_services()->apiUsersTable->removeApiUser()
remove_expired_user_tokens() has been replaced by _elgg_services()->usersApiSessions->removeExpiresTokens()
remove_user_token() has been replaced by _elgg_services()->usersApiSessions->removeToken()
send_api_call() use \Elgg\WebServices\ElggApiClient
send_api_get_call() use \Elgg\WebServices\ElggApiClient
send_api_post_call() use \Elgg\WebServices\ElggApiClient
service_handler()
validate_user_token() has been replaced by _elgg_services()->usersApiSessions->validateToken()
ws_page_handler()
ws_rest_handler() has been replaced by \Elgg\WebServices\RestServiceController

Miscellaneous changes

The config value for servicehandler has been removed
In certain edge cases the default value of an API parameter will not be applied

Type hinted functions 

The following functions now have their arguments type-hinted, this can cause TypeError errors. Also some class functions have their return value type hinted and you should update your function definition.

Class function parameters

ElggEntity::setLatLong() now requires a float for $lat and $long
ElggUser::setNotificationSetting() now requires a string for $method and a bool for $enabled
Elgg\Database\Seeds\Seed::__construct() now requires an int for $limit
Elgg\Http\ErrorResponse::__construct() now requires an int for $status_code
Elgg\Http\OkResponse::__construct() now requires an int for $status_code
Elgg\Http\RedirectResponse::__construct() now requires an int for $status_code
Elgg\I18n\Translator::getInstalledTranslations() now requires a bool for $calculate_completeness
SiteNotification::setActor() now requires an ElggEntity for $entity
SiteNotification::setURL() now requires a string for $url
SiteNotification::setRead() now requires a bool for $read

Class function return type

Elgg\Upgrade\Batch::getVersion() now requires an int return value
Elgg\Upgrade\Batch::shouldBeSkipped() now requires an bool return value
Elgg\Upgrade\Batch::needsIncrementOffset() now requires an bool return value
Elgg\Upgrade\Batch::countItems() now requires an int return value
Elgg\Upgrade\Batch::run() now requires an Elgg\Upgrade\Result return value

Lib function parameters

add_user_to_access_collection() now requires an int for $user_guid and $collection_id
can_edit_access_collection() now requires an int for $collection_id and $user_guid
create_access_collection() now requires an string for $name and int for $owner_guid
delete_access_collection() now requires an int for $collection_id
elgg_action_exists() now requires a string for $action
elgg_add_admin_notice() now requires a string for $id and $message
elgg_admin_notice_exists() now requires a string for $id
elgg_annotation_exists() now requires a int for $entity_guid, a string for $name and int for $owner_guid
elgg_delete_admin_notice() now requires a string for $id
elgg_delete_annotation_by_id() now requires a int for $id
elgg_deprecated_notice() now requires a string for $msg and $dep_version
elgg_error_response() now requires an int for $status_code
elgg_get_access_collections() now requires an array for $options
elgg_get_annotation_from_id() now requires an int for $id
elgg_get_subscriptions_for_container() now requires an int for $container_guid
elgg_get_plugin_from_id() now requires a string for $plugin_id
elgg_get_plugin_setting() now requires a string for $name and $plugin_id
elgg_get_plugin_user_setting() now requires a string for $name and $plugin_id and int for $user_guid
elgg_get_plugins() now requires a string for $status
elgg_get_river_item_from_id() now requires a int for $id
elgg_list_annotations() now requires an array for $options
elgg_ok_response() now requires an int for $status_code
elgg_plugin_exists() now requires a string for $plugin_id
elgg_redirect_response() now requires an int for $status_code
elgg_register_action() now requires a string for $action and $access
elgg_send_email() now requires an \Elgg\Email for $email
elgg_set_plugin_user_setting() now requires a string for $name and $plugin_id and int for $user_guid
elgg_unregister_action() now requires a string for $action
get_access_array() now requires an int for $user_guid
get_access_collection() now requires an int for $collection_id
get_entity_statistics() now requires an int for $owner_guid
get_members_of_access_collection() now requires an int for $collection_id and bool for $guids_only
get_readable_access_level() now requires an int for $entity_access_id
get_write_access_array() now requires an int for $user_guid and bool for $flush
has_access_to_entity() now requires an ElggEntity for $entity and ElggUser for $user
remove_user_from_access_collection() now requires an int for $user_guid and $collection_id
system_log_get_log() now requires an array for $options
messageboard_add() now requires an ElggUser, ElggUser, string and an int
elgg_register_external_file() now requires all arguments to be of the type string
elgg_unregister_external_file() now requires all arguments to be of the type string
elgg_load_external_file() now requires all arguments to be of the type string
elgg_get_loaded_external_files() now requires all arguments to be of the type string

Change in function parameters 

Class functions

Elgg\Http\ResponseBuilder::setStatusCode() no longer has a default value
ElggEntity::canWriteToContainer() no longer has a default value for $type and $subtype but these are required

Lib functions

elgg_get_page_owner_guid() no longer accepts $guid as a parameter
get_access_array() no longer accepts $flush as a parameter
elgg_register_external_file() no longer accepts $priority as a parameter

Renamed hook/event handler callbacks 

Special attention is required if you unregister the callbacks in your plugins as you might need to update your code.

Core

access_friends_acl_get_name() changed to Elgg\Friends\AclNameHandler::class
access_friends_acl_add_friend() changed to Elgg\Friends\AddToAclHandler::class
access_friends_acl_create() changed to Elgg\Friends\CreateAclHandler::class
access_friends_acl_remove_friend() changed to Elgg\Friends\RemoveFromAclHandler::class
_elgg_add_admin_widgets() changed to Elgg\Widgets\CreateAdminWidgetsHandler::class
_elgg_admin_check_admin_validation() changed to Elgg\Users\Validation::checkAdminValidation()
_elgg_admin_header_menu() changed to Elgg\Menus\AdminHeader::register() and Elgg\Menus\AdminHeader::registerMaintenance()
_elgg_admin_footer_menu() changed to Elgg\Menus\AdminFooter::registerHelpResources()
_elgg_admin_notify_admins_pending_user_validation() changed to Elgg\Users\Validation::notifyAdminsAboutPendingUsers()
_elgg_admin_page_menu() changed to Elgg\Menus\Page::registerAdminAdminister() and Elgg\Menus\Page::registerAdminConfigure() and Elgg\Menus\Page::registerAdminInformation()
_elgg_admin_page_menu_plugin_settings() changed to Elgg\Menus\Page::registerAdminPluginSettings()
_elgg_admin_prepare_admin_notification_make_admin() changed to Elgg\Notifications\MakeAdminUserEventHandler
_elgg_admin_prepare_admin_notification_remove_admin() changed to Elgg\Notifications\RemoveAdminUserEventHandler
_elgg_admin_prepare_user_notification_make_admin() changed to Elgg\Notifications\MakeAdminUserEventHandler
_elgg_admin_prepare_user_notification_remove_admin() changed to Elgg\Notifications\RemoveAdminUserEventHandler
_elgg_admin_save_notification_setting() changed to Elgg\Users\Settings::setAdminValidationNotification()
_elgg_admin_set_registration_forward_url() changed to Elgg\Users\Validation::setRegistrationForwardUrl()
_elgg_admin_user_unvalidated_bulk_menu() changed to Elgg\Menus\UserUnvalidatedBulk::registerActions()
_elgg_admin_user_validation_login_attempt() changed to Elgg\Users\Validation::preventUserLogin()
_elgg_admin_user_validation_notification() changed to Elgg\Users\Validation::notifyUserAfterValidation()
_elgg_admin_upgrades_menu() changed to Elgg\Menus\Filter::registerAdminUpgrades()
_elgg_cache_init() actions combined in Elgg\Application\SystemEventHandlers::ready()
_elgg_clear_caches() changed to Elgg\Cache\EventHandlers::clear()
_elgg_comments_access_sync() changed to Elgg\Comments\SyncContainerAccessHandler::class
_elgg_comments_container_permissions_override() changed to Elgg\Comments\ContainerPermissionsHandler::class
_elgg_comments_permissions_override() changed to Elgg\Comments\EditPermissionsHandler::class
_elgg_comments_prepare_content_owner_notification() changed to Elgg\Notifications\CreateCommentEventHandler
_elgg_comments_prepare_notification() changed to Elgg\Notifications\CreateCommentEventHandler
_elgg_comments_social_menu_setup() changed to Elgg\Menus\Social::registerComments()
_elgg_create_default_widgets() changed to Elgg\Widgets\CreateDefaultWidgetsHandler::class
_elgg_create_notice_of_pending_upgrade() changed to Elgg\Upgrade\CreateAdminNoticeHandler::class
_elgg_db_register_seeds() changed to Elgg\Database\RegisterSeedsHandler::class
_elgg_disable_caches() changed to Elgg\Cache\EventHandlers::disable()
_elgg_default_widgets_permissions_override() changed to Elgg\Widgets\DefaultWidgetsContainerPermissionsHandler::class
_elgg_disable_password_autocomplete() changed to Elgg\Input\DisablePasswordAutocompleteHandler::class
_elgg_enable_caches() changed to Elgg\Cache\EventHandlers::enable()
_elgg_filestore_move_icons() changed to Elgg\Icons\MoveIconsOnOwnerChangeHandler::class
_elgg_filestore_touch_icons() changed to Elgg\Icons\TouchIconsOnAccessChangeHandler::class
_elgg_head_manifest() changed to Elgg\Views\AddManifestLinkHandler::class
_elgg_annotations_default_menu_items() changed to Elgg\Menus\Annotation::registerDelete()
_elgg_walled_garden_menu() changed to Elgg\Menus\WalledGarden::registerHome()
_elgg_site_menu_init() changed to Elgg\Menus\Site::registerAdminConfiguredItems()
_elgg_site_menu_setup() changed to Elgg\Menus\Site::reorderItems()
_elgg_entity_menu_setup() changed to Elgg\Menus\Entity::registerEdit() and Elgg\Menus\Entity::registerDelete()
_elgg_entity_navigation_menu_setup() changed to Elgg\Menus\EntityNavigation::registerPreviousNext()
_elgg_enqueue_notification_event() changed to Elgg\Notifications\EnqueueEventHandler::class
_elgg_groups_container_override() changed to Elgg\Groups\MemberPermissionsHandler::class
_elgg_groups_comment_permissions_override() changed to Elgg\Comments\GroupMemberPermissionsHandler::class
_elgg_htmlawed_filter_tags() changed to Elgg\Input\ValidateInputHandler::class
_elgg_invalidate_caches() changed to Elgg\Cache\EventHandlers::invalidate()
_elgg_widget_menu_setup() changed to Elgg\Menus\Widget::registerEdit() and Elgg\Menus\Widget::registerDelete()
_elgg_login_menu_setup() changed to Elgg\Menus\Login::registerRegistration() and Elgg\Menus\Widget::registerResetPassword()
_elgg_nav_public_pages() changed to Elgg\WalledGarden\ExtendPublicPagesHandler::class
_elgg_notifications_cron() changed to Elgg\Notifications\ProcessQueueCronHandler::class
_elgg_notifications_smtp_default_message_id_header() changed to Elgg\Email\DefaultMessageIdHeaderHandler::class
_elgg_notifications_smtp_thread_headers() changed to Elgg\Email\ThreadHeadersHandler::class
_elgg_rebuild_public_container() changed to Elgg\Cache\EventHandlers::rebuildPublicContainer()
_elgg_river_update_object_last_action() changed to Elgg\River\UpdateLastActionHandler::class
_elgg_rss_menu_setup() changed to Elgg\Menus\Footer::registerRSS()
_elgg_plugin_entity_menu_setup() changed to Elgg\Menus\Entity::registerPlugin()
_elgg_purge_caches() changed to Elgg\Cache\EventHandlers::purge()
_elgg_river_menu_setup() changed to Elgg\Menus\River::registerDelete()
_elgg_save_notification_user_settings() changed to Elgg\Notifications\SaveUserSettingsHandler::class
_elgg_session_cleanup_persistent_login() changed to Elgg\Users\CleanupPersistentLoginHandler::class
_elgg_set_lightbox_config() changed to Elgg\Javascript\SetLightboxConfigHandler::class
_elgg_set_user_default_access() changed to Elgg\Users\Settings::setDefaultAccess()
_elgg_set_user_email() changed to Elgg\Users\Settings::setEmail()
_elgg_set_user_password() changed to Elgg\Users\Settings::setPassword()
_elgg_set_user_language() changed to Elgg\Users\Settings::setLanguage()
_elgg_set_user_name() changed to Elgg\Users\Settings::setName()
_elgg_set_user_username() changed to Elgg\Users\Settings::setUsername()
_elgg_send_email_notification() changed to Elgg\Notifications\SendEmailHandler::class
_elgg_upgrade_completed() changed to Elgg\Upgrade\UpgradeCompletedAdminNoticeHandler::class
_elgg_upgrade_entity_menu() changed to Elgg\Menus\Entity::registerUpgrade()
_elgg_user_ban_notification() changed to Elgg\Users\BanUserNotificationHandler::class
_elgg_user_get_subscriber_unban_action() changed to Elgg\Notifications\UnbanUserEventHandler
_elgg_user_prepare_unban_notification() changed to Elgg\Notifications\UnbanUserEventHandler
_elgg_user_settings_menu_register() changed to Elgg\Menus\Page::registerUserSettings() and Elgg\Menus\Page::registerUserSettingsPlugins()
_elgg_user_settings_menu_prepare() changed to Elgg\Menus\Page::cleanupUserSettingsPlugins()
elgg_user_hover_menu() changed to Elgg\Menus\UserHover::registerAvatarEdit() and Elgg\Menus\UserHover::registerAdminActions()
_elgg_user_set_icon_file() changed to Elgg\Icons\SetUserIconFileHandler::class
_elgg_user_title_menu() changed to Elgg\Menus\Title::registerAvatarEdit()
_elgg_user_page_menu() changed to Elgg\Menus\Page::registerAvatarEdit()
_elgg_user_topbar_menu() changed to Elgg\Menus\Topbar::registerUserLinks()
_elgg_user_unvalidated_menu() changed to Elgg\Menus\UserUnvalidated::register()
_elgg_views_amd() changed to Elgg\Views\AddAmdModuleNameHandler::class
_elgg_views_file_help_upload_limit() changed to Elgg\Input\AddFileHelpTextHandler::class
_elgg_views_init() combined into Elgg\Application\SystemEventHandlers::init()
_elgg_views_minify() changed to Elgg\Views\MinifyHandler::class
_elgg_views_prepare_favicon_links() changed to Elgg\Page\AddFaviconLinksHandler::class
_elgg_views_preprocess_css() changed to Elgg\Views\PreProcessCssHandler::class
_elgg_views_send_header_x_frame_options() changed to Elgg\Page\SetXFrameOptionsHeaderHandler::class
_elgg_walled_garden_init() merged into Elgg\Application\SystemEventHandlers::initLate()
_elgg_walled_garden_remove_public_access() changed to Elgg\WalledGarden\RemovePublicAccessHandler::class
_elgg_widgets_widget_urls() changed to Elgg\Widgets\EntityUrlHandler::class
elgg_prepare_breadcrumbs() changed to Elgg\Page\PrepareBreadcrumbsHandler::class
Elgg\Profiler::handleOutput changed to Elgg\Debug\Profiler::class
users_init combined into Elgg\Application\SystemEventHandlers::initLate()

Plugins

_developers_entity_menu changed to Elgg\Developers\Menus\Entity::registerEntityExplorer
_developers_page_menu changed to Elgg\Developers\Menus\Page::register
_elgg_activity_owner_block_menu changed to Elgg\Activity\Menus\OwnerBlock::registerUserItem and Elgg\Activity\Menus\OwnerBlock::registerGroupItem
blog_archive_menu_setup changed to Elgg\Blog\Menus\BlogArchive::register
blog_owner_block_menu changed to Elgg\Blog\Menus\OwnerBlock::registerUserItem and Elgg\Blog\Menus\OwnerBlock::registerGroupItem
blog_prepare_notification changed to Elgg\Blog\Notifications\PublishBlogEventHandler
blog_register_db_seeds changed to Elgg\Blog\Database::registerSeeds
bookmarks_footer_menu changed to Elgg\Bookmarks\Menus\Footer::register
bookmarks_owner_block_menu changed to Elgg\Bookmarks\Menus\OwnerBlock::registerUserItem and Elgg\Bookmarks\Menus\OwnerBlock::registerGroupItem
bookmarks_page_menu changed to Elgg\Bookmarks\Menus\Page::register
bookmarks_prepare_notification changed to Elgg\Bookmarks\Notifications\CreateBookmarksEventHandler
bookmarks_register_db_seeds changed to Elgg\Bookmarks\Database::registerSeeds
ckeditor_longtext_id changed to Elgg\CKEditor\Views::setInputLongTextIDViewVar
ckeditor_longtext_menu changed to Elgg\CKEditor\Menus\LongText::registerToggler
dashboard_default_widgets changed to Elgg\Dashboard\Widgets::extendDefaultWidgetsList
developers_log_events changed to Elgg\Developers\HandlerLogger::trackEvent and Elgg\Developers\HandlerLogger::trackHook
diagnostics_basic_hook changed to Elgg\Diagnostics\Reports::getBasic
diagnostics_globals_hook changed to Elgg\Diagnostics\Reports::getGlobals
diagnostics_phpinfo_hook changed to Elgg\Diagnostics\Reports::getPHPInfo
diagnostics_sigs_hook changed to Elgg\Diagnostics\Reports::getSigs
discussion_comment_permissions changed to Elgg\Discussions\Permissions::preventCommentOnClosedDiscussion
discussion_get_subscriptions changed to Elgg\Discussions\Notifications::addGroupSubscribersToCommentOnDiscussionSubscriptions
discussion_owner_block_menu changed to Elgg\Discussions\Menus\OwnerBlock::registerGroupItem
discussion_prepare_comment_notification changed to Elgg\Discussions\Notifications::prepareCommentOnDiscussionNotification
discussion_prepare_notification changed to Elgg\Discussions\Notifications\CreateDiscussionEventHandler
discussion_register_db_seeds changed to Elgg\Discussions\Database::registerSeeds
Elgg\DevelopersPlugins\* changed to Elgg\Developers\*
Elgg\Discussions\Menus::registerSiteMenuItem changed to Elgg\Discussions\Menus\Site::register
Elgg\Discussions\Menus::filterTabs changed to Elgg\Discussions\Menus\Filter::filterTabsForDiscussions
embed_longtext_menu changed to Elgg\Embed\Menus\LongText::register
embed_select_tab changed to Elgg\Embed\Menus\Embed::selectCorrectTab
embed_set_thumbnail_url changed to Elgg\Embed\Icons::setThumbnailUrl
expages_menu_register_hook changed to Elgg\ExternalPages\Menus\ExPages::register
file_handle_object_delete changed to Elgg\File\Icons::deleteIconOnElggFileDelete
file_prepare_notification changed to Elgg\File\Notifications\CreateFileEventHandler
file_register_db_seeds changed to Elgg\File\Database::registerSeeds
file_set_custom_icon_sizes changed to Elgg\File\Icons::setIconSizes
file_set_icon_file changed to Elgg\File\Icons::setIconFile
file_set_icon_url changed to Elgg\File\Icons::setIconUrl
file_owner_block_menu changed to Elgg\File\Menus\OwnerBlock::registerUserItem and Elgg\File\Menus\OwnerBlock::registerGroupItem
_elgg_friends_filter_tabs changed to Elgg\Friends\Menus\Filter::registerFilterTabs
_elgg_friends_page_menu changed to Elgg\Friends\Menus\Page::register
_elgg_friends_register_access_type changed to Elgg\Friends\Access::registerAccessCollectionType
_elgg_friends_setup_title_menu changed to Elgg\Friends\Menus\Title::register
_elgg_friends_setup_user_hover_menu changed to Elgg\Friends\Menus\UserHover::register
_elgg_friends_topbar_menu changed to Elgg\Friends\Menus\Topbar::register
_elgg_friends_widget_urls changed to Elgg\Friends\Widgets::setWidgetUrl
_elgg_send_friend_notification changed to Elgg\Friends\Notifications::sendFriendNotification
Elgg\Friends\FilterMenu::addFriendRequestTabs changed to Elgg\Friends\Menus\Filter::addFriendRequestTabs
Elgg\Friends\RelationshipMenu::addPendingFriendRequestItems changed to Elgg\Friends\Menus\Relationship::addPendingFriendRequestItems
Elgg\Friends\RelationshipMenu::addPendingFriendRequestItems changed to Elgg\Friends\Menus\Relationship::addPendingFriendRequestItems
Elgg\Friends\Relationships::createFriendRelationship changed to Elgg\Friends\Relationships::removePendingFriendRequest
_groups_gatekeeper_allow_profile_page changed to Elgg\Groups\Access::allowProfilePage
_groups_page_menu changed to Elgg\Groups\Menus\Page::register
_groups_page_menu_group_profile changed to Elgg\Groups\Menus\Page::registerGroupProfile
_groups_relationship_invited_menu changed to Elgg\Groups\Menus\Relationship::registerInvitedItems
_groups_relationship_member_menu changed to Elgg\Groups\Menus\Relationship::registerRemoveUser
_groups_relationship_membership_request_menu changed to Elgg\Groups\Menus\Relationship::registerMembershipRequestItems
_groups_title_menu changed to Elgg\Groups\Menus\Title::register
_groups_topbar_menu_setup changed to Elgg\Groups\Menus\Topbar::register
groups_access_default_override changed to Elgg\Groups\Access::overrideDefaultAccess
groups_create_event_listener changed to Elgg\Groups\Group::createAccessCollection
groups_default_page_owner_handler changed to Elgg\Groups\PageOwner::detectPageOwner
groups_entity_menu_setup changed to Elgg\Groups\Menus\Entity::register and Elgg\Groups\Menus\Entity::registerFeature
groups_fields_setup changed to Elgg\Groups\FieldsHandler
groups_members_menu_setup changed to Elgg\Groups\Menus\GroupsMembers::register
groups_set_access_collection_name changed to Elgg\Groups\Access::getAccessCollectionName
groups_set_url changed to Elgg\Groups\Group::getEntityUrl
groups_setup_filter_tabs changed to Elgg\Groups\Menus\Filter::registerGroupsAll
groups_update_event_listener changed to Elgg\Groups\Group::updateGroup
groups_user_join_event_listener changed to Elgg\Groups\Group::joinGroup
groups_user_leave_event_listener changed to Elgg\Groups\Group::leaveGroup
groups_write_acl_plugin_hook changed to Elgg\Groups\Access::getWriteAccess
invitefriends_add_friends changed to Elgg\InviteFriends\Users::addFriendsOnRegister
invitefriends_register_page_menu changed to Elgg\InviteFriends\Menus\Page::register
likes_permissions_check changed to Elgg\Likes\Permissions::allowLikedEntityOwner
likes_permissions_check_annotate changed to Elgg\Likes\Permissions::allowLikeOnEntity
likes_social_menu_setup changed to Elgg\Likes\Menus\Social::register
members_register_filter_menu changed to Elgg\Members\Menus\Filter::register
messages_can_edit changed to Elgg\Messages\Permissions::canEdit
messages_can_edit_container changed to Elgg\Messages\Permissions::canEditContainer
messages_purge changed to Elgg\Messages\User::purgeMessages
messages_register_topbar changed to Elgg\Messages\Menus\Topbar::register
messages_user_hover_menu changed to Elgg\Messages\Menus\UserHover::register and Elgg\Messages\Menus\Title::register
notifications_update_collection_notify changed to Elgg\Notifications\Relationships::updateUserNotificationsPreferencesOnACLChange
notifications_update_friend_notify changed to Elgg\Friends\Relationships::applyFriendNotificationsSettings
notifications_relationship_remove changed to Elgg\Friends\Relationships::deleteFriendNotificationSubscription and Elgg\Groups\Relationships::removeGroupNotificationSubscriptions
_notifications_page_menu changed to Elgg\Notifications\Menus\Page::register
_notification_groups_title_menu changed to Elgg\Notifications\Menus\Title::register
pages_container_permission_check changed to Elgg\Pages\Permissions::allowContainerWriteAccess
pages_entity_menu_setup changed to Elgg\Pages\Menus\Entity::register
pages_icon_url_override changed to Elgg\Pages\Icons::getIconUrl
pages_owner_block_menu changed to Elgg\Pages\Menus\OwnerBlock::registerUserItem and Elgg\Pages\Menus\OwnerBlock::registerGroupItem
pages_prepare_notification changed to Elgg\Pages\Notifications\CreatePageEventHandler
pages_register_db_seeds changed to Elgg\Pages\Database::registerSeeds
pages_set_revision_url changed to Elgg\Pages\Extender::setRevisionUrl
pages_write_access_options_hook changed to Elgg\Pages\Views::removeAccessPublic
pages_write_access_vars changed to Elgg\Pages\Views::preventAccessPublic
pages_write_permission_check changed to Elgg\Pages\Permissions::allowWriteAccess
Elgg\Pages\Menus::registerPageMenuItems changed to Elgg\Pages\Menus\PagesNav::register
_profile_admin_page_menu changed to Elgg\Profile\Menus\Page::registerAdminProfileFields
_profile_fields_setup changed to Elgg\Profile\FieldsHandler
_profile_title_menu changed to Elgg\Profile\Menus\Title::register
_profile_topbar_menu changed to Elgg\Profile\Menus\Topbar::register
_profile_user_hover_menu changed to Elgg\Profile\Menus\UserHover::register
_profile_user_page_menu changed to Elgg\Profile\Menus\Page::registerProfileEdit
profile_default_widgets_hook changed to Elgg\Profile\Widgets::getDefaultWidgetsList
reportedcontent_user_hover_menu changed to Elgg\ReportedContent\Menus\UserHover::register
search_exclude_robots changed to Elgg\Search\Site::preventSearchIndexing
search_output_tag changed to Elgg\Search\Views::setSearchHref
site_notifications_register_entity_menu changed to Elgg\SiteNotifications\Menus\Entity::register
site_notifications_send changed to Elgg\SiteNotifications\Notifications::createSiteNotifications
_uservalidationbyemail_user_unvalidated_bulk_menu changed to Elgg\UserValidationByEmail\Menus\UserUnvalidatedBulk::register
_uservalidationbyemail_user_unvalidated_menu changed to Elgg\UserValidationByEmail\Menus\UserUnvalidated::register
uservalidationbyemail_after_registration_url changed to Elgg\UserValidationByEmail\Response::redirectToEmailSent
uservalidationbyemail_check_manual_login changed to Elgg\UserValidationByEmail\User::preventLogin
uservalidationbyemail_disable_new_user changed to Elgg\UserValidationByEmail\User::disableUserOnRegistration
system_log_archive_cron changed to Elgg\SystemLog\Cron::rotateLogs
system_log_default_logger changed to Elgg\SystemLog\Logger::log
system_log_delete_cron changed to Elgg\SystemLog\Cron::deleteLogs
system_log_listener changed to Elgg\SystemLog\Logger::listen
system_log_user_hover_menu changed to Elgg\SystemLog\Menus\UserHover::register
thewire_add_original_poster changed to Elgg\TheWire\Notifications\CreateTheWireEventHandler
thewire_owner_block_menu changed to Elgg\TheWire\Menus\OwnerBlock::register
thewire_prepare_notification changed to Elgg\TheWire\Notifications\CreateTheWireEventHandler
thewire_setup_entity_menu_items changed to Elgg\TheWire\Menus\Entity::register

Reworked exceptions 

All exceptions in the Elgg system now extend the Elgg\Exceptions\Exception and are in the namespace Elgg\Exceptions

Moved exceptions

ClassException use Elgg\Exceptions\ClassException
ConfigurationException use Elgg\Exceptions\ConfigurationException
CronException use Elgg\Exceptions\CronException
DatabaseException use Elgg\Exceptions\DatabaseException
DataFormatException use Elgg\Exceptions\DataFormatException
InstallationException use Elgg\Exceptions\Configuration\InstallationException
InvalidParameterException use Elgg\Exceptions\InvalidParameterException
IOException use Elgg\Exceptions\FileSystem\IOException
LoginException use Elgg\Exceptions\LoginException
PluginException use Elgg\Exceptions\PluginException
RegistrationException use Elgg\Exceptions\Configuration\RegistrationException
SecurityException use Elgg\Exceptions\SecurityException
Elgg\Database\EntityTable\UserFetchFailureException use Elgg\Exceptions\Database\UserFetchFailureException
Elgg\Di\FactoryUncallableException use Elgg\Exceptions\Di\FactoryUncallableException
Elgg\Di\MissingValueException use Elgg\Exceptions\Di\MissingValueException
Elgg\Http\Exception\AdminGatekeeperException use Elgg\Exceptions\Http\Gatekeeper\AdminGatekeeperException
Elgg\Http\Exception\AjaxGatekeeperException use Elgg\Exceptions\Http\Gatekeeper\AjaxGatekeeperException
Elgg\Http\Exception\GroupToolGatekeeperException use Elgg\Exceptions\Http\Gatekeeper\GroupToolGatekeeperException
Elgg\Http\Exception\LoggedInGatekeeperException use Elgg\Exceptions\Http\Gatekeeper\LoggedInGatekeeperException
Elgg\Http\Exception\LoggedOutGatekeeperException use Elgg\Exceptions\Http\Gatekeeper\LoggedOutGatekeeperException
Elgg\Http\Exception\UpgradeGatekeeperException use Elgg\Exceptions\Http\Gatekeeper\UpgradeGatekeeperException
Elgg\I18n\InvalidLocaleException use Elgg\Exceptions\I18n\InvalidLocaleException
Elgg\BadRequestException use Elgg\Exceptions\Http\BadRequestException
Elgg\CsrfException use Elgg\Exceptions\Http\CsrfException
Elgg\EntityNotFoundException use Elgg\Exceptions\Http\EntityNotFoundException
Elgg\EntityPermissionsException use Elgg\Exceptions\Http\EntityPermissionsException
Elgg\GatekeeperException use Elgg\Exceptions\Http\GatekeeperException
Elgg\GroupGatekeeperException use Elgg\Exceptions\Http\Gatekeeper\GroupGatekeeperException
Elgg\HttpException use Elgg\Exceptions\HttpException
Elgg\PageNotFoundException use Elgg\Exceptions\Http\PageNotFoundException
Elgg\ValidationException use Elgg\Exceptions\Http\ValidationException
Elgg\WalledGardenException use Elgg\Exceptions\Http\Gatekeeper\WalledGardenException

Removed exceptions

CallException
ClassNotFoundException
IncompleteEntityException
InvalidClassException
NotificationException
NotImplementedException from the Web Services plugin

Reworked Traits 

In order to better organize the Elgg namespace all Traits have been moved to the Elgg\Traits namespace

Elgg\Cacheable moved to Elgg\Traits\Cacheable
Elgg\Cli\PluginsHelper moved to Elgg\Traits\Cli\PluginsHelper
Elgg\Cli\Progressing moved to Elgg\Traits\Cli\Progressing
Elgg\Database\Seeds\Seeding\GroupHelpers moved to Elgg\Traits\Seeding\GroupHelpers
Elgg\Database\Seeds\Seeding\TimeHelpers moved to Elgg\Traits\Seeding\TimeHelpers
Elgg\Database\Seeds\Seeding moved to Elgg\Traits\Seeding
Elgg\Database\LegacyQueryOptionsAdapter moved to Elgg\Traits\Database\LegacyQueryOptionsAdapter
Elgg\Debug\Profilable moved to Elgg\Traits\Debug\Profilable
Elgg\Di\ServiceFacade moved to Elgg\Traits\Di\ServiceFacade
Elgg\Entity\ProfileData moved to Elgg\Traits\Entity\ProfileData
Elgg\Loggable moved to Elgg\Traits\Loggable
Elgg\Notifications\EventSerialization moved to Elgg\Traits\Notifications\EventSerialization
Elgg\TimeUsing moved to Elgg\Traits\TimeUsing

Miscellaneous API changes 

The defaults for ignore_empty_body and prevent_double_submit when using elgg_view_form have been changed to true.
The plugin settings forms (plugins/{$plugin_id}/settings) no longer receive $vars['plugin'] use $vars['entity']
Elgg\Router\Middleware\WalledGarden::isPublicPage() can no longer be called statically
Elgg\Cli\PluginsHelper::getDependents() is no longer publically available
ElggPlugin::getLanguagesPath() is no longer publically available
An \ElggBatch no longer implements the interface Elgg\BatchResult but still has the same features
An \ElggEntity no longer implements the interface Locatable but still has the same features
An \Elgg\Event no longer implements the interfaces \Elgg\ObjectEvent and \Elgg\UserEvent but still has the same features
The view output/icon no longer uses the convert view var
ElggData::save() now always returns a bool as documented. All extending classes have been updated (eg. ElggEntity, ElggMetadata, ElggRelationship, etc.)
Elgg\Email::getTo() now always returns an array
ElggPlugin::activate() and ElggPlugin::deactivate() now can throw an Elgg\Exceptions\PluginException with more details about the failure
\ElggRelationship::RELATIONSHIP_LIMIT has been removed use ElggDatabaseRelationshipsTable::RELATIONSHIP_COLUMN_LENGTH``
The constants ORIGIN_SUBSCRIPTIONS and ORIGIN_INSTANT in \Elgg\Notifications\Notification have been removed
You can no longer use the delete, <entity_type> event to prevent deletion of an entity. Use the delete:before, <entity_type> event
External Files are no longer ordered by priority but will be returned in the same order as they are registered
The interface Friendable has been removed. Implemented functions in ElggUser have been moved to Elgg\Traits\Entity\Friends
The config flag profile_using_custom is no longer available
The return value of elgg_create_river_item() will be false in the case the creation was prevented by the 'create:before', 'river' event
The constant ELGG_PLUGIN_USER_SETTING_PREFIX has been removed use the helper function \ElggUser::getNamespacedPluginSettingName()
The constant ELGG_PLUGIN_INTERNAL_PREFIX has been removed to get the plugin priority private setting name use \ElggPlugin::PRIORITY_SETTING_NAME
The class SiteNotificationFactory was removed use SiteNotification::factory()
The class Elgg\Email\Address no longer throws Laminas\Mail\Exception\InvalidArgumentException but now throws Elgg\Exceptions\InvalidArgumentException

Deprecated APIs 

Class functions

ElggPlugin::getUserSetting() use ElggUser::getPluginSetting()
ElggPlugin::setUserSetting() use ElggUser::setPluginSetting()

Lib functions

forward() use Elgg\Exceptions\HttpException instances or elgg_redirect_response()

Plugin hooks

'usersettings', 'plugin' use the hook 'plugin_setting', '<entity type>'

Removed functions 

Class functions

Elgg\Config::getEntityTypes() use Elgg\Config::ENTITY_TYPES constant
ElggFile::setDescription() use $file->description = $new_description
ElggGroup::addObjectToGroup()
ElggGroup::removeObjectFromGroup()
ElggPlugin::getAllUserSettings()
ElggPlugin::getDependencyReport()
ElggPlugin::getError()
ElggPlugin::unsetAllUserSettings()
ElggPlugin::unsetAllUserAndPluginSettings() use ElggPlugin::unsetAllEntityAndPluginSettings()
ElggWidget::getContext() use $entity->context
ElggWidget::setContext() use $entity->context = $context
Elgg\Notifications\NotificationsService::getDeprecatedHandler()
Elgg\Notifications\NotificationsService::getMethodsAsDeprecatedGlobal() use elgg_get_notification_methods()
Elgg\Notifications\NotificationsService::registerDeprecatedHandler()
Elgg\Notifications\NotificationsService::setDeprecatedNotificationSubject()
Elgg\Email::getRecipient() use Elgg\Email::getTo()
Elgg\Email::setRecipient()
Elgg\Entity::getLocation() use $entity->location
Elgg\Entity::setLocation() use $entity->location = $location

Lib functions

access_get_show_hidden_status() use elgg()->session->getDisabledEntityVisibility()
diagnostics_md5_dir()
elgg_add_subscription() use \ElggEntity::addSubscription()
elgg_get_available_languages() use elgg()->translator->getAvailableLanguages()
elgg_get_all_plugin_user_settings()
elgg_get_entities_from_plugin_user_settings() use elgg_get_entities() with private settings parameters and prefix your setting name with plugin:user_setting:
elgg_get_filter_tabs() use menu hooks on 'register', 'menu:filter:<filter_id>'
elgg_get_loaded_css() use elgg_get_loaded_external_files('css', 'head')
elgg_get_loaded_js() use elgg_get_loaded_external_files('js', $location)
elgg_get_system_messages() use elgg()->system_messages->loadRegisters()
elgg_prepend_css_urls()
elgg_remove_subscription() use \ElggEntity::removeSubscription()
elgg_set_plugin_setting() use $plugin->setSetting($name, $value)
elgg_set_plugin_user_setting() use ElggUser::setPluginSetting()
elgg_set_system_messages() use elgg()->system_messages->saveRegisters()
elgg_unset_plugin_setting() use $plugin->unsetSetting($name)
elgg_unset_plugin_user_setting() use ElggUser::removePluginSetting()
get_language_completeness() use elgg()->translator->getLanguageCompleteness()
get_installed_translations() use elgg()->translator->getInstalledTranslations()
group_access_options()
pages_is_page()
system_log_get_log()
system_log_get_log_entry()
system_log_get_object_from_log_entry()
system_log_get_seconds_in_period()
system_log_archive_log()
system_log_browser_delete_log()
thewire_get_parent() use \ElggWire::getParent()
validate_email_address() use elgg()->accounts->assertValidEmail()
validate_password() use elgg()->accounts->assertValidPassword()
validate_username() use elgg()->accounts->assertValidUsername()

Removed views / resources 

admin/develop_tools/inspect/webservices
elgg/thewire.js
input/urlshortener
messages/js moved to forms/messages/process.js
navigation/menu/elements/item_deps the functionality has been merged into navigation/menu/elements/item
object/plugin/elements/contributors
notifications/groups
notifications/personal use notifications/settings or notifications/users
notifications/settings/personal moved to notifications/settings/records
notifications/settings/collections
notifications/settings/other extend notifications/settings/records
notifications/subscriptions/groups use forms/notifications/subscriptions/groups
notifications/subscriptions/users use forms/notifications/subscriptions/users
resources/comments/view use \Elgg\Controllers\CommentEntityRedirector
resources/river use resources/activity/all or resources/activity/owner or resources/activity/friends
reportedcontent/admin_css
thewire/previous

Removed hooks / events 

Event created, river has been removed. Use the create:after, river event.
Hook creating, river has been removed. Use the create:before, river event if you want to block the creation of a river item.
Hook filter_tabs, <context> has been removed. Use the register, menu:filter:<filter_id> hook
Hook output, ajax has been removed. Use the ajax_response hook if you want to influence the results.
Hook reportedcontent:add has been removed. Use the create, object event to prevent creation.
Hook reportedcontent:archive has been removed. Use the permissions_check, object hook.
Hook reportedcontent:delete has been removed. Use the delete, object event to prevent deletion.

Removed actions 

The action reportedcontent/delete has been replaced with a generic entity delete action