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

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• obfuscate_email() : factor_email\factor
• obfuscate_filepath() : enrol_flatfile_plugin
• objclone() : TCPDF_STATIC
• object_init() : js_writer
• objectOrClass() : Assert\Assertion
• oci_package_installed() : oci_native_moodle_database
• of() : GuzzleHttp\Promise\Coroutine
• official_profile_exists() : tool_moodlenet\profile_manager
• OffsetDate() : ADOConnection, ADODB_pdo, ADODB_postgres64
• offsetDate() : ADODB_mssqlnative
• offsetExists() : CFArray, Firebase\JWT\CachedKeySet, Phpml\Clustering\KMeans\Point, question_attempt_iterator, question_attempt_step_iterator, question_attempt_steps_with_submitted_response_iterator, ScssPhp\ScssPhp\Node\Number
• offsetGet() : CFArray, Firebase\JWT\CachedKeySet, HTMLPurifier_StringHash, Phpml\Clustering\KMeans\Point, question_attempt_iterator, question_attempt_step_iterator, question_attempt_steps_with_submitted_response_iterator, ScssPhp\ScssPhp\Node\Number
• offsetSet() : CFArray, Firebase\JWT\CachedKeySet, Phpml\Clustering\KMeans\Point, question_attempt_iterator, ScssPhp\ScssPhp\Node\Number
• offsetUnset() : CFArray, Firebase\JWT\CachedKeySet, Phpml\Clustering\KMeans\Point, question_attempt_iterator, ScssPhp\ScssPhp\Node\Number
• ofLimit() : GuzzleHttp\Promise\Each
• ofLimitAll() : GuzzleHttp\Promise\Each
• on_after_write_attempt() : lesson_page, lesson_page_type_essay
• on_basiclti_end() : moodle1_mod_lti_handler
• on_book_chapters_end() : moodle1_mod_book_handler
• on_book_chapters_start() : moodle1_mod_book_handler
• on_book_end() : moodle1_mod_book_handler
• on_chat_end() : moodle1_mod_chat_handler
• on_choice_end() : moodle1_mod_choice_handler
• on_choice_options_end() : moodle1_mod_choice_handler
• on_choice_options_start() : moodle1_mod_choice_handler
• on_course_modules_end() : moodle1_course_outline_handler
• on_course_section_end() : moodle1_course_outline_handler
• on_course_sections_end() : moodle1_course_outline_handler
• on_data_end() : moodle1_mod_data_handler
• on_elements_end() : moodle1_workshopform_handler, moodle1_workshopform_numerrors_handler, moodle1_workshopform_rubric_handler
• on_elements_start() : moodle1_workshopform_handler, moodle1_workshopform_numerrors_handler, moodle1_workshopform_rubric_handler
• on_feedback_end() : moodle1_mod_feedback_handler
• on_forum_end() : moodle1_mod_forum_handler
• on_glossary_categories_end() : moodle1_mod_glossary_handler
• on_glossary_categories_start() : moodle1_mod_glossary_handler
• on_glossary_end() : moodle1_mod_glossary_handler
• on_gradebook_end() : moodle1_gradebook_handler
• on_gradebook_grade_item_grades_start() : moodle1_gradebook_handler
• on_gradebook_grade_outcomes_end() : moodle1_outcomes_handler
• on_gradebook_grade_outcomes_start() : moodle1_outcomes_handler
• on_gradebook_start() : moodle1_gradebook_handler
• on_info_details_end() : moodle1_info_handler
• on_info_details_mod_end() : moodle1_info_handler
• on_legacy_element_end() : moodle1_workshopform_handler
• on_legacy_resource_end() : moodle1_resource_successor_handler
• on_lesson_end() : moodle1_mod_lesson_handler
• on_question_categories_end() : moodle1_question_bank_handler
• on_question_categories_start() : moodle1_question_bank_handler
• on_question_category_end() : moodle1_question_bank_handler
• on_question_category_start() : moodle1_question_bank_handler
• on_questions_end() : moodle1_question_bank_handler
• on_quiz_end() : moodle1_mod_quiz_handler
• on_resource_end() : moodle1_mod_resource_handler
• on_roles_end() : moodle1_roles_definition_handler
• on_root_element_end() : moodle1_root_handler
• on_root_element_start() : moodle1_root_handler
• on_scales_start() : moodle1_scales_handler
• on_scorm_end() : moodle1_mod_scorm_handler
• on_survey_end() : moodle1_mod_survey_handler
• on_wiki_end() : moodle1_mod_wiki_handler
• on_workshop_element_end() : moodle1_mod_workshop_handler
• on_workshop_elements_end() : moodle1_mod_workshop_handler
• on_workshop_elements_start() : moodle1_mod_workshop_handler
• on_workshop_end() : moodle1_mod_workshop_handler
• onContentItem() : IMSGlobal\LTI\ToolProvider\ToolProvider
• one_from() : core\attribute_helper
• one_sample_per_analysable() : core\analytics\analyser\courses, core\analytics\analyser\users, core_analytics\local\analyser\base
• onError() : enrol_lti\tool_provider, IMSGlobal\LTI\ToolProvider\ToolProvider
• onespace2empty() : oci_native_moodle_database
• oneWayF() : Phpml\Math\Statistic\ANOVA
• ongoing_score() : mod_lesson_renderer
• onLaunch() : enrol_lti\tool_provider, IMSGlobal\LTI\ToolProvider\ToolProvider
• onQuickFormEvent() : MoodleQuickForm_autocomplete, MoodleQuickForm_cancel, MoodleQuickForm_checkbox, MoodleQuickForm_date_selector, MoodleQuickForm_date_time_selector, MoodleQuickForm_defaultcustom, MoodleQuickForm_duration, MoodleQuickForm_editor, MoodleQuickForm_filemanager, MoodleQuickForm_filetypes, MoodleQuickForm_float, MoodleQuickForm_grading, MoodleQuickForm_group, MoodleQuickForm_modgrade, MoodleQuickForm_modvisible, MoodleQuickForm_selectgroups, MoodleQuickForm_selectyesno, MoodleQuickForm_submit, MoodleQuickForm_tags, MoodleQuickForm_textarea
• onRegister() : enrol_lti\tool_provider, IMSGlobal\LTI\ToolProvider\ToolProvider
• opAdd() : ScssPhp\ScssPhp\Compiler
• opAddNumberNumber() : ScssPhp\ScssPhp\Compiler
• opAnd() : ScssPhp\ScssPhp\Compiler
• opColorColor() : ScssPhp\ScssPhp\Compiler
• opColorNumber() : ScssPhp\ScssPhp\Compiler
• opDivNumberNumber() : ScssPhp\ScssPhp\Compiler
• open() : core\session\database, core\session\redis, file_archive, OpenSpout\Reader\AbstractReader, OpenSpout\Reader\ReaderInterface, webdav_client, zip_archive
• open_tab() : behat_navigation
• open_xml_writer() : moodle1_qtype_handler, moodle1_xml_handler
• openFileForWriting() : MatthiasMullie\Minify\Minify
• openFileInZip() : OpenSpout\Reader\Wrapper\XMLReader
• openReader() : OpenSpout\Reader\AbstractReader, OpenSpout\Reader\CSV\Reader, OpenSpout\Reader\ODS\Reader, OpenSpout\Reader\XLSX\Reader
• openToBrowser() : OpenSpout\Writer\AbstractWriter, OpenSpout\Writer\WriterInterface
• openWriter() : OpenSpout\Writer\AbstractWriter, OpenSpout\Writer\AbstractWriterMultiSheets, OpenSpout\Writer\CSV\Writer
• opEq() : ScssPhp\ScssPhp\Compiler
• opEqNumberNumber() : ScssPhp\ScssPhp\Compiler
• opGteNumberNumber() : ScssPhp\ScssPhp\Compiler
• opGtNumberNumber() : ScssPhp\ScssPhp\Compiler
• opLteNumberNumber() : ScssPhp\ScssPhp\Compiler
• opLtNumberNumber() : ScssPhp\ScssPhp\Compiler
• opModNumberNumber() : ScssPhp\ScssPhp\Compiler
• opMulNumberNumber() : ScssPhp\ScssPhp\Compiler
• opNeq() : ScssPhp\ScssPhp\Compiler
• opNeqNumberNumber() : ScssPhp\ScssPhp\Compiler
• opNumberColor() : ScssPhp\ScssPhp\Compiler
• opOr() : ScssPhp\ScssPhp\Compiler
• opSubNumberNumber() : ScssPhp\ScssPhp\Compiler
• optimal_probablility_high() : question_cbm
• optimal_probablility_low() : question_cbm
• optimize() : core_search\engine
• optimize_index() : core_search\manager
• optimizeDatabase() : adodb_perf
• OptimizeTable() : adodb_perf
• optimizeTable() : perf_mysql, perf_postgres
• option_description_string() : lesson_page, lesson_page_type_matching, lesson_page_type_multichoice, lesson_page_type_shortanswer
• option_to_class() : tool_analytics\output\helper
• optional_param() : moodleform, MoodleQuickForm
• optional_param_mark() : question_utils
• optionExists() : MoodleQuickForm_autocomplete
• options() : curl, gradereport_singleview\local\screen\grade, gradereport_singleview\local\screen\screen, gradereport_singleview\local\screen\selectable_items, gradereport_singleview\local\screen\user, webdav_client
• options_definitions() : tool_uploaduser\cli_helper
• order_all_observers() : core\event\manager
• order_by() : mod_glossary_entry_query_builder
• order_by_author() : mod_glossary_entry_query_builder
• order_plugins() : core_admin\table\editor_management_table, core_admin\table\plugin_management_table
• order_sql() : core_analytics\local\analyser\base
• orderElements() : xmldb_object
• orderFields() : xmldb_table
• orderIndexes() : xmldb_table
• orderKeys() : xmldb_table
• orderTables() : xmldb_structure
• original_definition() : gradereport_singleview\local\screen\grade
• original_headers() : gradereport_singleview\local\screen\grade, gradereport_singleview\local\screen\user
• other_attempt_fields() : mod_quiz\local\reports\attempts_report_options_form, quiz_overview_settings_form, quiz_responses_settings_form
• other_cols() : assign_grading_table, core_user\table\participants, core_webservice\token_table, flexible_table, mod_feedback_responses_table, mod_quiz\local\reports\attempts_report_table, quiz_last_responses_table, quiz_overview_table, quiz_statistics_question_table, tool_policy\acceptances_table
• other_plugins_that_require() : core\plugin_manager
• other_preference_fields() : mod_quiz\local\reports\attempts_report_options_form, quiz_overview_settings_form, quiz_responses_settings_form
• otherwise() : GuzzleHttp\Promise\Coroutine, GuzzleHttp\Promise\FulfilledPromise, GuzzleHttp\Promise\Promise, GuzzleHttp\Promise\PromiseInterface, GuzzleHttp\Promise\RejectedPromise
• out() : core_admin\table\hook_list_table, core_admin\table\plugin_management_table, core_reportbuilder\table\custom_report_table, core_user\table\participants, forumreport_summary\summary_table, lang_string, mod_feedback_responses_table, moodle_url, report_loglive_table_log_ajax, table_sql
• out_as_local_url() : moodle_url
• out_omit_querystring() : moodle_url
• outcome() : core_question_renderer
• outcome_from_results() : backup_cron_automated_helper
• outdated_langpack_is_installed() : behat_tool_langimport
• outp() : ADOConnection
• outp_throw() : ADOConnection
• OutParameter() : ADOConnection
• Output() : pdf
• output() : combined_progress_trace, comment, core_h5p\player, core_reportbuilder\system_report, error_log_progress_trace, file_xml_database_exporter, gradereport_singleview\report\singleview, html_list_progress_trace, html_progress_trace, null_progress_trace, Phpml\Classification\Linear\Perceptron, progress_trace, progress_trace_buffer, ScssPhp\ScssPhp\Node\Number, string_xml_database_exporter, text_progress_trace, tool_uploadcourse_tracker, xml_database_exporter
• output_all_question_response_analysis() : quiz_statistics_report
• output_caching_info() : quiz_statistics_report
• output_edit_lists() : qbank_managecategories\question_category_object
• output_headers() : table_dataformat_export_format
• output_html() : admin_setting, admin_setting_check, admin_setting_configcheckbox, admin_setting_configcolourpicker, admin_setting_configdirectory, admin_setting_configduration, admin_setting_configempty, admin_setting_configexecutable, admin_setting_configfile, admin_setting_confightmleditor, admin_setting_configmulticheckbox, admin_setting_configmultiselect, admin_setting_configpasswordunmask, admin_setting_configselect, admin_setting_configselect_autocomplete, admin_setting_configstoredfile, admin_setting_configtext, admin_setting_configtext_with_maxlength, admin_setting_configtextarea, admin_setting_configtime, admin_setting_courselist_frontpage, admin_setting_description, admin_setting_devicedetectregex, admin_setting_emoticons, admin_setting_enablemobileservice, admin_setting_encryptedpassword, admin_setting_filetypes, admin_setting_gradecat_combo, admin_setting_heading, admin_setting_ldap_rolemapping, admin_setting_manage_plugins, admin_setting_manageantiviruses, admin_setting_manageauths, admin_setting_managecontentbankcontenttypes, admin_setting_managecustomfields, admin_setting_managedataformats, admin_setting_manageenrols, admin_setting_manageexternalservices, admin_setting_manageformats, admin_setting_managemediaplayers, admin_setting_managerepository, admin_setting_managewebserviceprotocols, admin_setting_php_extension_enabled, admin_setting_searchsetupinfo, admin_setting_special_calendar_weekend, admin_setting_special_gradepointmax, admin_setting_webservicesoverview, admin_settingpage, core\aws\admin_settings_aws_region, core_admin\admin\admin_setting_plugin_manager, core_admin\local\settings\autocomplete, core_admin\local\settings\filesize, core_admin\local\settings\setting_scheduled_task_status, core_communication\admin\manage_communication_providers_page, core_question\admin\manage_qbank_plugins_page, editor_atto_subplugins_setting, enrol_lti\local\ltiadvantage\admin\admin_setting_registeredplatforms, mod_glossary_admin_setting_display_formats, mod_quiz\admin\review_setting, theme_boost_admin_settingspage_tabs, tiny_premium\local\admin_setting_tiny_premium_plugins, tool_log_setting_managestores, tool_mfa\local\admin_setting_managemfa
• output_individual_question_data() : quiz_statistics_report
• output_individual_question_response_analysis() : quiz_statistics_report
• output_line() : tool_uploaduser\local\cli_progress_tracker, tool_uploaduser\local\text_progress_tracker
• output_log() : xhtml_container_stack
• output_msg() : behat_command
• output_new_table() : qbank_managecategories\question_category_object
• output_optgroup() : user_selector_base
• output_options() : user_selector_base
• output_quiz_info_table() : quiz_statistics_report
• output_quiz_structure_analysis_table() : quiz_statistics_report
• output_report_zerostate() : gradereport_user\report\user
• output_select_html() : admin_setting_configselect
• output_setting_flag() : admin_setting_flag
• output_setting_flags() : admin_setting
• output_statistics_graph() : quiz_statistics_report
• output_user() : group_non_members_selector, user_selector_base
• outputClass() : Phpml\Classification\Linear\Perceptron
• ouwiki_changes() : ouwiki_changes
• ouwiki_line() : ouwiki_line
• ouwiki_word() : ouwiki_word
• overall_feedback() : mod_workshop_renderer
• overall_feedback_attachment_options() : workshop
• overall_feedback_content_options() : workshop
• overridden_activity_completion_condition_displayed_as() : behat_completion
• overridden_by() : core_completion\cm_completion_details
• overridden_manual_completion_button_displayed_as() : behat_completion
• override_active_url() : navigation_node
• override_activity_completion_status() : core_completion_external
• override_activity_completion_status_parameters() : core_completion_external
• override_activity_completion_status_returns() : core_completion_external
• override_children() : custom_menu
• override_customdata() : cm_info
• override_endpoint() : ltiservice_gradebookservices\local\service\gradebookservices, mod_lti\local\ltiservice\service_base
• override_exists() : assign
• override_next_page() : lesson_page, lesson_page_type_cluster, lesson_page_type_endofcluster
• override_task_setting() : core\moodlenet\resource_packager
• override_type_showinactivitychooser() : mod_lti\local\types_helper
• overridetossl_warning() : core_admin_renderer
• overwrite_existing_draftfile() : repository