Here is a list of all documented variables with links to the class documentation for each member:

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ABANDONED : mod_quiz\quiz_attempt
ACCESS_DELETED : core_search\manager
ACCESS_DENIED : core_search\manager
ACCESS_GRANTED : core_search\manager
aContents : Sabberworm\CSS\CSSList\CSSList
ACTION_ADD : quizaccess_seb\template_controller
ACTION_CHECK_REGISTRATION : tool_brickfield\brickfieldconnect
ACTION_COMPLETE : core_competency\evidence
ACTION_CREATE : tool_licensemanager\manager
ACTION_DELETE : quizaccess_seb\template_controller, tool_licensemanager\manager
ACTION_DELETESTEP : tool_usertours\manager
ACTION_DELETETOUR : tool_usertours\manager
ACTION_DISABLE : tool_licensemanager\manager
ACTION_DUPLICATETOUR : tool_usertours\manager
ACTION_EDIT : quizaccess_seb\template_controller
ACTION_EDITSTEP : tool_usertours\manager
ACTION_EDITTOUR : tool_usertours\manager
ACTION_ENABLE : tool_licensemanager\manager
ACTION_EXPORTTOUR : tool_usertours\manager
ACTION_FIXED : core_analytics\prediction
ACTION_HIDE : quizaccess_seb\template_controller
ACTION_HIDETOUR : tool_usertours\manager
ACTION_IMPORTTOUR : tool_usertours\manager
ACTION_INCORRECTLY_FLAGGED : core_analytics\prediction
ACTION_LISTTOURS : tool_usertours\manager
ACTION_LOG : core_competency\evidence
ACTION_MOVE_DOWN : tool_licensemanager\manager
ACTION_MOVE_UP : tool_licensemanager\manager
ACTION_MOVESTEP : tool_usertours\manager
ACTION_MOVETOUR : tool_usertours\manager
ACTION_NEWSTEP : tool_usertours\manager
ACTION_NEWTOUR : tool_usertours\manager
ACTION_NOT_APPLICABLE : core_analytics\prediction
ACTION_NOT_USEFUL : core_analytics\prediction
ACTION_OVERRIDE : core_competency\evidence
ACTION_PREDICTION_DETAILS : core_analytics\prediction
ACTION_SEND_SUMMARY : tool_brickfield\brickfieldconnect
ACTION_SHOW : quizaccess_seb\template_controller
ACTION_SHOWTOUR : tool_usertours\manager
ACTION_UPDATE : tool_licensemanager\manager
ACTION_USEFUL : core_analytics\prediction
ACTION_VIEW : quizaccess_seb\template_controller
ACTION_VIEW_LICENSE_MANAGER : tool_licensemanager\manager
ACTION_VIEWSTEP : tool_usertours\manager
ACTION_VIEWTOUR : tool_usertours\manager
ACTIVITY : Google_Service_Appsactivity
ADD_NUM_ITEMS : qtype_ddtoimage_edit_form_base
ADDDIMS : workshop_accumulative_strategy, workshop_comments_strategy, workshop_numerrors_strategy, workshop_rubric_strategy
ADEXCHANGE_BUYER : Google_Service_AdExchangeBuyer
ADEXCHANGE_SELLER : Google_Service_AdExchangeSeller
ADEXCHANGE_SELLER_READONLY : Google_Service_AdExchangeSeller
ADHOC_TASK_FAILED_RETENTION : core\task\manager
ADHOC_TASK_QUEUE_MODE_DISTRIBUTING : core\task\manager
ADHOC_TASK_QUEUE_MODE_FILLING : core\task\manager
ADMIN_DATATRANSFER : Google_Service_DataTransfer
ADMIN_DATATRANSFER_READONLY : Google_Service_DataTransfer
ADMIN_DIRECTORY_CUSTOMER : Google_Service_Directory
ADMIN_DIRECTORY_CUSTOMER_READONLY : Google_Service_Directory
ADMIN_DIRECTORY_DEVICE_CHROMEOS : Google_Service_Directory
ADMIN_DIRECTORY_DEVICE_CHROMEOS_READONLY : Google_Service_Directory
ADMIN_DIRECTORY_DEVICE_MOBILE : Google_Service_Directory
ADMIN_DIRECTORY_DEVICE_MOBILE_ACTION : Google_Service_Directory
ADMIN_DIRECTORY_DEVICE_MOBILE_READONLY : Google_Service_Directory
ADMIN_DIRECTORY_DOMAIN : Google_Service_Directory
ADMIN_DIRECTORY_DOMAIN_READONLY : Google_Service_Directory
ADMIN_DIRECTORY_GROUP : Google_Service_Directory, Google_Service_Script
ADMIN_DIRECTORY_GROUP_MEMBER : Google_Service_Directory
ADMIN_DIRECTORY_GROUP_MEMBER_READONLY : Google_Service_Directory
ADMIN_DIRECTORY_GROUP_READONLY : Google_Service_Directory
ADMIN_DIRECTORY_NOTIFICATIONS : Google_Service_Directory
ADMIN_DIRECTORY_ORGUNIT : Google_Service_Directory
ADMIN_DIRECTORY_ORGUNIT_READONLY : Google_Service_Directory
ADMIN_DIRECTORY_ROLEMANAGEMENT : Google_Service_Directory
ADMIN_DIRECTORY_ROLEMANAGEMENT_READONLY : Google_Service_Directory
ADMIN_DIRECTORY_USER : Google_Service_Directory, Google_Service_Script
ADMIN_DIRECTORY_USER_ALIAS : Google_Service_Directory
ADMIN_DIRECTORY_USER_ALIAS_READONLY : Google_Service_Directory
ADMIN_DIRECTORY_USER_READONLY : Google_Service_Directory
ADMIN_DIRECTORY_USER_SECURITY : Google_Service_Directory
ADMIN_DIRECTORY_USERSCHEMA : Google_Service_Directory
ADMIN_DIRECTORY_USERSCHEMA_READONLY : Google_Service_Directory
ADMIN_PAGE_URL : mod_bigbluebuttonbn\local\plugins\admin_page_manage_extensions
ADMIN_REPORTS_AUDIT_READONLY : Google_Service_Reports
ADMIN_REPORTS_USAGE_READONLY : Google_Service_Reports
ADSENSE : Google_Service_AdSense
ADSENSE_READONLY : Google_Service_AdSense
ADSENSEHOST : Google_Service_AdSenseHost
AFTER_CLOSE : mod_quiz\admin\review_setting, mod_quiz\question\display_options
AGREEMENT_COMPULSORY : tool_policy\policy_version
AGREEMENT_OPTIONAL : tool_policy\policy_version
AGREEMENTSTYLE_CONSENTPAGE : tool_policy\policy_version
AGREEMENTSTYLE_OWNPAGE : tool_policy\policy_version
AIRNOTIFIER_PUBLICURL : message_airnotifier_manager
ALERT : Google_Logger_Abstract
ALIAS_ALIAS : mod_glossary_entry_query_builder
ALIAS_CATEGORIES : mod_glossary_entry_query_builder
ALIAS_ENTRIES : mod_glossary_entry_query_builder
ALIAS_ENTRIES_CATEGORIES : mod_glossary_entry_query_builder
ALIAS_USER : mod_glossary_entry_query_builder
ALL_THEMES_TO_RUN : behat_config_util
ALL_TRIES : question_attempt
ALL_WITH : mod_quiz\local\reports\attempts_report
ALLOCATION_EXISTS : workshop
ALLOW_REDIRECTS : GuzzleHttp\RequestOptions
ALMOST_ZERO : mod_quiz\grade_calculator
ALWAYS_INCLUDE_FIELD : ltiservice_memberships\local\service\memberships
ALWAYS_LATEST : qbank_previewquestion\question_preview_options
AMOUNT_MEMORY_NEEDED_PER_STRING_IN_KB : OpenSpout\Reader\XLSX\Manager\SharedStringsCaching\CachingStrategyFactory
ANALYSISBYREQUEST : tool_brickfield\analysis
ANALYSISDISABLED : tool_brickfield\analysis
ANALYTICS : Google_Service_Analytics
ANALYTICS_EDIT : Google_Service_Analytics
ANALYTICS_FILENAME : core_analytics\manager
ANALYTICS_MANAGE_USERS : Google_Service_Analytics
ANALYTICS_MANAGE_USERS_READONLY : Google_Service_Analytics
ANALYTICS_PROVISION : Google_Service_Analytics
ANALYTICS_READONLY : Google_Service_Analytics
ANDROIDENTERPRISE : Google_Service_AndroidEnterprise
ANDROIDPUBLISHER : Google_Service_AndroidPublisher, Google_Service_GamesConfiguration
ANTELOPE_MAX_ROW_SIZE : mysql_sql_generator
ANY_VALUE : core_reportbuilder\local\filters\boolean_select, core_reportbuilder\local\filters\filesize, core_reportbuilder\local\filters\number, core_reportbuilder\local\filters\select, core_reportbuilder\local\filters\tags
ANYVALUE : tool_usertours\local\filter\base
API_CREATE_RESOURCE_URI : core\moodlenet\moodlenet_client
API_KEY : tool_brickfield\registration
API_SCOPE_CREATE_RESOURCE : core\moodlenet\moodlenet_client
APIROOT : core\update\api
APIVER : core\update\api
APPENGINE_ADMIN : Google_Service_Manager
APPS_GROUPS_MIGRATION : Google_Service_GroupsMigration
APPS_GROUPS_SETTINGS : Google_Service_Groupssettings
APPS_LICENSING : Google_Service_Licensing
APPS_ORDER : Google_Service_Reseller
APPS_ORDER_READONLY : Google_Service_Reseller
APPSTATE : Google_Service_AppState
ARCHIVE_INDEX_COUNT_PREFIX : tgz_packer
ARCHIVE_INDEX_FILE : tgz_packer
array< string, $cssColors=['aliceblue'=> : ScssPhp\ScssPhp\Colors
array< string, $namespaces=['special'=> : ScssPhp\ScssPhp\Compiler
array< string, $operatorNames=['+'=> : ScssPhp\ScssPhp\Compiler
array< string, $supported_algs=['ES384'=> : JWT
ARRAY_RECURSIVE_KEY : Laravel\SerializableClosure\Serializers\Native
ART_BOX : PageBoundaries
ASSIGNFEEDBACK_INTERFACE : mod_assign\privacy\provider
ASSIGNFEEDBACK_USER_INTERFACE : mod_assign\privacy\provider
ASSIGNSUBMISSION_INTERFACE : mod_assign\privacy\provider
ASSIGNSUBMISSION_USER_INTERFACE : mod_assign\privacy\provider
AUDIENCE_ALL : tool_policy\policy_version
AUDIENCE_GUESTS : tool_policy\policy_version
AUDIENCE_LOGGEDIN : tool_policy\policy_version
AUTH : GuzzleHttp\RequestOptions
AUTHSYNCFIELDS : core_user
AUTOCOMMIT_WITHIN : search_solr\engine
AUTOLOGOUT_CUSTOM : tool_mobile\api
AUTOLOGOUT_DISABLED : tool_mobile\api
AUTOLOGOUT_INMEDIATE : tool_mobile\api
AVAILABILITY_EXCERPT_MAXSIZE : core_courseformat\output\local\content\section\availability