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Developer Documentation
See Release Notes
Long Term Support Release
- Bug fixes for general core bugs in 4.1.x will end 13 November 2023 (12 months).
- Bug fixes for security issues in 4.1.x will end 10 November 2025 (36 months).
- PHP version: minimum PHP 7.4.0 Note: minimum PHP version has increased since Moodle 4.0. PHP 8.0.x is supported too.
/lib/ -> questionlib.php (source)
Differences Between: [Versions 310 and 401] [Versions 311 and 401] [Versions 39 and 401] [Versions 400 and 401] [Versions 401 and 402] [Versions 401 and 403]
Code for handling and processing questions. This is code that is module independent, i.e., can be used by any module that uses questions, like quiz, lesson, etc. This script also loads the questiontype classes. Code for handling the editing of questions is in question/editlib.php
| Copyright: | 1999 onwards Martin Dougiamas and others {@link http://moodle.com} |
| License: | http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| File Size: | 2358 lines (94 kb) |
| Included or required: | 0 times |
| Referenced: | 2 times |
| Includes or requires: | 0 files |
Defines 64 functions
question_reorder_qtypes()
question_save_qtype_order()
questions_in_use()
question_context_has_any_questions()
match_grade_options()
question_category_delete_safe()
question_category_in_use()
delete_question_bank_entry()
question_delete_question()
question_delete_context()
question_delete_course()
question_delete_course_category()
question_save_from_deletion()
question_delete_activity()
question_move_question_tags_to_new_context()
idnumber_exist_in_question_category()
question_move_questions_to_category()
move_question_set_references()
question_move_category_to_context()
question_preload_questions()
question_load_questions()
_tidy_question()
get_question_options()
question_sort_tags()
print_question_icon()
sort_categories_by_tree()
question_get_default_category()
question_get_top_category()
question_get_top_categories_for_contexts()
question_make_default_categories()
question_categorylist()
question_categorylist_parents()
get_import_export_formats()
question_default_export_filename()
question_has_capability_on()
question_require_capability_on()
question_edit_url()
question_extend_settings_navigation()
question_get_question_capabilities()
question_get_all_capabilities()
question_rewrite_question_urls()
question_rewrite_question_preview_urls()
question_pluginfile()
core_question_question_preview_pluginfile()
question_page_type_list()
question_module_uses_questions()
core_question_find_next_unused_idnumber()
get_question_bank_entry()
get_question_version()
get_next_version()
is_latest()
question_preview_url()
question_preview_popup_params()
question_hash()
question_make_export_url()
question_get_export_single_question_url()
question_remove_stale_questions_from_category()
flatten_category_tree()
add_indented_names()
question_category_select_menu()
get_categories_for_contexts()
question_category_options()
question_add_context_in_key()
question_fix_top_names()
question_save_qtype_order()
questions_in_use()
question_context_has_any_questions()
match_grade_options()
question_category_delete_safe()
question_category_in_use()
delete_question_bank_entry()
question_delete_question()
question_delete_context()
question_delete_course()
question_delete_course_category()
question_save_from_deletion()
question_delete_activity()
question_move_question_tags_to_new_context()
idnumber_exist_in_question_category()
question_move_questions_to_category()
move_question_set_references()
question_move_category_to_context()
question_preload_questions()
question_load_questions()
_tidy_question()
get_question_options()
question_sort_tags()
print_question_icon()
sort_categories_by_tree()
question_get_default_category()
question_get_top_category()
question_get_top_categories_for_contexts()
question_make_default_categories()
question_categorylist()
question_categorylist_parents()
get_import_export_formats()
question_default_export_filename()
question_has_capability_on()
question_require_capability_on()
question_edit_url()
question_extend_settings_navigation()
question_get_question_capabilities()
question_get_all_capabilities()
question_rewrite_question_urls()
question_rewrite_question_preview_urls()
question_pluginfile()
core_question_question_preview_pluginfile()
question_page_type_list()
question_module_uses_questions()
core_question_find_next_unused_idnumber()
get_question_bank_entry()
get_question_version()
get_next_version()
is_latest()
question_preview_url()
question_preview_popup_params()
question_hash()
question_make_export_url()
question_get_export_single_question_url()
question_remove_stale_questions_from_category()
flatten_category_tree()
add_indented_names()
question_category_select_menu()
get_categories_for_contexts()
question_category_options()
question_add_context_in_key()
question_fix_top_names()
Functions that are not part of a class:
| question_reorder_qtypes($sortedqtypes, $tomove, $direction) X-Ref |
| Move one question type in a list of question types. If you try to move one element off of the end, nothing will change. param: array $sortedqtypes An array $qtype => anything. param: string $tomove one of the keys from $sortedqtypes param: integer $direction +1 or -1 return: array an array $index => $qtype, with $index from 0 to n in order, and |
| question_save_qtype_order($neworder, $config = null) X-Ref |
| Save a new question type order to the config_plugins table. param: array $neworder An arra $index => $qtype. Indices should start at 0 and be in order. param: object $config get_config('question'), if you happen to have it around, to save one DB query. |
| questions_in_use($questionids) X-Ref |
| Check if the question is used. param: array $questionids of question ids. return: boolean whether any of these questions are being used by any part of Moodle. |
| question_context_has_any_questions($context) X-Ref |
| Determine whether there are any questions belonging to this context, that is whether any of its question categories contain any questions. This will return true even if all the questions are hidden. param: mixed $context either a context object, or a context id. return: boolean whether any of the question categories beloning to this context have |
| match_grade_options($gradeoptionsfull, $grade, $matchgrades = 'error') X-Ref |
| Check whether a given grade is one of a list of allowed options. If not, depending on $matchgrades, either return the nearest match, or return false to signal an error. param: array $gradeoptionsfull list of valid options param: int $grade grade to be tested param: string $matchgrades 'error' or 'nearest' return: false|int|string either 'fixed' value or false if error. |
| question_category_delete_safe($category) X-Ref |
| Category is about to be deleted, 1/ All questions are deleted for this question category. 2/ Any questions that can't be deleted are moved to a new category NOTE: this function is called from lib/db/upgrade.php param: object|core_course_category $category course category object |
| question_category_in_use($categoryid, $recursive = false) X-Ref |
| Tests whether any question in a category is used by any part of Moodle. param: integer $categoryid a question category id. param: boolean $recursive whether to check child categories too. return: boolean whether any question in this category is in use. |
| delete_question_bank_entry($entryid) X-Ref |
| Check if there is more versions left for the entry. If not delete the entry. param: int $entryid |
| question_delete_question($questionid) X-Ref |
| Deletes question and all associated data from the database It will not delete a question if it is used somewhere, instead it will just delete the reference. param: int $questionid The id of the question being deleted |
| question_delete_context($contextid) X-Ref |
| All question categories and their questions are deleted for this context id. param: int $contextid The contextid to delete question categories from return: array only returns an empty array for backwards compatibility. |
| question_delete_course($course, $notused = false) X-Ref |
| All question categories and their questions are deleted for this course. param: stdClass $course an object representing the activity param: bool $notused this argument is not used any more. Kept for backwards compatibility. return: bool always true. |
| question_delete_course_category($category, $newcategory, $notused=false) X-Ref |
| Category is about to be deleted, 1/ All question categories and their questions are deleted for this course category. 2/ All questions are moved to new category param: stdClass|core_course_category $category course category object param: stdClass|core_course_category $newcategory empty means everything deleted, otherwise id of param: bool $notused this argument is no longer used. Kept for backwards compatibility. return: boolean |
| question_save_from_deletion($questionids, $newcontextid, $oldplace, $newcategory = null) X-Ref |
| Creates a new category to save the questions in use. param: array $questionids of question ids param: object $newcontextid the context to create the saved category in. param: string $oldplace a textual description of the think being deleted, param: object $newcategory return: mixed false on |
| question_delete_activity($cm, $notused = false) X-Ref |
| All question categories and their questions are deleted for this activity. param: object $cm the course module object representing the activity param: bool $notused the argument is not used any more. Kept for backwards compatibility. return: boolean |
| question_move_question_tags_to_new_context(array $questions, context $newcontext) X-Ref |
| This function will handle moving all tag instances to a new context for a given list of questions. Questions can be tagged in up to two contexts: 1.) The context the question exists in. 2.) The course context (if the question context is a higher context. E.g. course category context or system context. This means a question that exists in a higher context (e.g. course cat or system context) may have multiple groups of tags in any number of child course contexts. Questions in the course category context can be move "down" a context level into one of their child course contexts or activity contexts which affects the availability of that question in other courses / activities. In this case it makes the questions no longer available in the other course or activity contexts so we need to make sure that the tag instances in those other contexts are removed. param: stdClass[] $questions The list of question being moved (must include param: context $newcontext The Moodle context the questions are being moved to |
| idnumber_exist_in_question_category($questionidnumber, $categoryid, $limitfrom = 0, $limitnum = 1) X-Ref |
| Check if an idnumber exist in the category. param: int $questionidnumber param: int $categoryid param: int $limitfrom param: int $limitnum return: array |
| question_move_questions_to_category($questionids, $newcategoryid) X-Ref |
| This function should be considered private to the question bank, it is called from question/editlib.php question/contextmoveq.php and a few similar places to to the work of actually moving questions and associated data. However, callers of this function also have to do other work, which is why you should not call this method directly from outside the questionbank. param: array $questionids of question ids. param: integer $newcategoryid the id of the category to move to. return: bool |
| move_question_set_references(int $oldcategoryid, int $newcatgoryid,int $oldcontextid, int $newcontextid, bool $delete = false) X-Ref |
| Update the questioncontextid field for all question_set_references records given a new context id param: int $oldcategoryid Old category to be moved. param: int $newcatgoryid New category that will receive the questions. param: int $oldcontextid Old context to be moved. param: int $newcontextid New context that will receive the questions. param: bool $delete If the action is delete. |
| question_move_category_to_context($categoryid, $oldcontextid, $newcontextid) X-Ref |
| This function helps move a question cateogry to a new context by moving all the files belonging to all the questions to the new context. Also moves subcategories. param: integer $categoryid the id of the category being moved. param: integer $oldcontextid the old context id. param: integer $newcontextid the new context id. |
| question_preload_questions($questionids = null, $extrafields = '', $join = '', $extraparams = [], $orderby = '') X-Ref |
| Given a list of ids, load the basic information about a set of questions from the questions table. The $join and $extrafields arguments can be used together to pull in extra data. See, for example, the usage in mod/quiz/attemptlib.php, and read the code below to see how the SQL is assembled. Throws exceptions on error. param: array $questionids array of question ids to load. If null, then all param: string $extrafields extra SQL code to be added to the query. param: string $join extra SQL code to be added to the query. param: array $extraparams values for any placeholders in $join. param: string $orderby what to order the results by. Optional, default is unspecified order. return: array partially complete question objects. You need to call get_question_options |
| question_load_questions($questionids, $extrafields = '', $join = '') X-Ref |
| Load a set of questions, given a list of ids. The $join and $extrafields arguments can be used together to pull in extra data. See, for example, the usage in mod/quiz/attempt.php, and read the code below to see how the SQL is assembled. Throws exceptions on error. param: array $questionids array of question ids. param: string $extrafields extra SQL code to be added to the query. param: string $join extra SQL code to be added to the query. return: array|string question objects. |
| _tidy_question($question, $category, array $tagobjects = null, array $filtercourses = null) X-Ref |
| Private function to factor common code out of get_question_options(). param: object $question the question to tidy. param: stdClass $category The question_categories record for the given $question. param: stdClass[]|null $tagobjects The tags for the given $question. param: stdClass[]|null $filtercourses The courses to filter the course tags by. |
| get_question_options(&$questions, $loadtags = false, $filtercourses = null) X-Ref |
| Updates the question objects with question type specific information by calling {@see get_question_options()} Can be called either with an array of question objects or with a single question object. param: mixed $questions Either an array of question objects to be updated param: bool $loadtags load the question tags from the tags table. Optional, default false. param: stdClass[] $filtercourses The courses to filter the course tags by. return: bool Indicates success or failure. |
| question_sort_tags($tagobjects, $categorycontext, $filtercourses = null) X-Ref |
| Sort question tags by course or normal tags. This function also search tag instances that may have a context id that don't match either a course or question context and fix the data setting the correct context id. param: stdClass[] $tagobjects The tags for the given $question. param: stdClass $categorycontext The question categories context. param: stdClass[]|null $filtercourses The courses to filter the course tags by. return: stdClass $sortedtagobjects Sorted tag objects. |
| print_question_icon($question) X-Ref |
| Print the icon for the question type param: object $question The question object for which the icon is required. return: string the HTML for the img tag. |
| sort_categories_by_tree(&$categories, $id = 0, $level = 1) X-Ref |
| Returns the categories with their names ordered following parent-child relationships. finally it tries to return pending categories (those being orphaned, whose parent is incorrect) to avoid missing any category from original array. param: array $categories param: int $id param: int $level return: array |
| question_get_default_category($contextid) X-Ref |
| Get the default category for the context. param: integer $contextid a context id. return: object|bool the default question category for that context, or false if none. |
| question_get_top_category($contextid, $create = false) X-Ref |
| Gets the top category in the given context. This function can optionally create the top category if it doesn't exist. param: int $contextid A context id. param: bool $create Whether create a top category if it doesn't exist. return: bool|stdClass The top question category for that context, or false if none. |
| question_get_top_categories_for_contexts($contextids) X-Ref |
| Gets the list of top categories in the given contexts in the array("categoryid,categorycontextid") format. param: array $contextids List of context ids return: array |
| question_make_default_categories($contexts) X-Ref |
| Gets the default category in the most specific context. If no categories exist yet then default ones are created in all contexts. param: array $contexts The context objects for this context and all parent contexts. return: object The default category - the category in the course context |
| question_categorylist($categoryid) X-Ref |
| Get the list of categories. param: int $categoryid return: array of question category ids of the category and all subcategories. |
| question_categorylist_parents(int $categoryid) X-Ref |
| Get all parent categories of a given question category in decending order. param: int $categoryid for which you want to find the parents. return: array of question category ids of all parents categories. |
| get_import_export_formats($type) X-Ref |
| Get list of available import or export formats param: string $type 'import' if import list, otherwise export list assumed return: array sorted list of import/export formats available |
| question_default_export_filename($course, $category) X-Ref |
| Create a reasonable default file name for exporting questions from a particular category. param: object $course the course the questions are in. param: object $category the question category. return: string the filename. |
| question_has_capability_on($questionorid, $cap, $notused = -1) X-Ref |
| Check capability on category. param: int|stdClass|question_definition $questionorid object or id. param: string $cap 'add', 'edit', 'view', 'use', 'move' or 'tag'. param: int $notused no longer used. return: bool this user has the capability $cap for this question $question? |
| question_require_capability_on($question, $cap) X-Ref |
| Require capability on question. param: int|stdClass|question_definition $question object or id. param: string $cap 'add', 'edit', 'view', 'use', 'move' or 'tag'. return: bool true if the user has the capability. Throws exception if not. |
| question_edit_url($context) X-Ref |
| Gets the question edit url. param: object $context a context return: string|bool A URL for editing questions in this context. |
| question_extend_settings_navigation(navigation_node $navigationnode, $context, $baseurl = '/question/edit.php') X-Ref |
| Adds question bank setting links to the given navigation node if caps are met and loads the navigation from the plugins. Qbank plugins can extend the navigation_plugin_base and add their own navigation node, this method will help to autoload those nodes in the question bank navigation. param: navigation_node $navigationnode The navigation node to add the question branch to param: object $context param: string $baseurl the url of the base where the api is implemented from return: navigation_node Returns the question branch that was added |
| question_get_question_capabilities() X-Ref |
| Get the array of capabilities for question. return: array all the capabilities that relate to accessing particular questions. |
| question_get_all_capabilities() X-Ref |
| Get the question bank caps. return: array all the question bank capabilities. |
| question_rewrite_question_urls($text, $file, $contextid, $component, $filearea,array $ids, $itemid, array $options=null) X-Ref |
| Helps call file_rewrite_pluginfile_urls with the right parameters. param: string $text text being processed param: string $file the php script used to serve files param: int $contextid context ID param: string $component component param: string $filearea filearea param: array $ids other IDs will be used to check file permission param: int $itemid item ID param: array $options options return: string |
| question_rewrite_question_preview_urls($text, $questionid, $filecontextid, $filecomponent, $filearea, $itemid,$previewcontextid, $previewcomponent, $options = null) X-Ref |
| Rewrite the PLUGINFILE urls in part of the content of a question, for use when viewing the question outside an attempt (for example, in the question bank listing or in the quiz statistics report). param: string $text the question text. param: int $questionid the question id. param: int $filecontextid the context id of the question being displayed. param: string $filecomponent the component that owns the file area. param: string $filearea the file area name. param: int|null $itemid the file's itemid param: int $previewcontextid the context id where the preview is being displayed. param: string $previewcomponent component responsible for displaying the preview. param: array $options text and file options ('forcehttps'=>false) return: string $questiontext with URLs rewritten. |
| question_pluginfile($course, $context, $component, $filearea, $args, $forcedownload, $options = []) X-Ref |
| Called by pluginfile.php to serve files related to the 'question' core component and for files belonging to qtypes. For files that relate to questions in a question_attempt, then we delegate to a function in the component that owns the attempt (for example in the quiz, or in core question preview) to get necessary inforation. (Note that, at the moment, all question file areas relate to questions in attempts, so the If at the start of the last paragraph is always true.) Does not return, either calls send_file_not_found(); or serves the file. param: stdClass $course course settings object param: stdClass $context context object param: string $component the name of the component we are serving files for. param: string $filearea the name of the file area. param: array $args the remaining bits of the file path. param: bool $forcedownload whether the user must be forced to download the file. param: array $options additional options affecting the file serving return: array|bool |
| core_question_question_preview_pluginfile($previewcontext, $questionid, $filecontext, $filecomponent,$filearea, $args, $forcedownload, $options = []) X-Ref |
| Serve questiontext files in the question text when they are displayed in this report. param: context $previewcontext the context in which the preview is happening. param: int $questionid the question id. param: context $filecontext the file (question) context. param: string $filecomponent the component the file belongs to. param: string $filearea the file area. param: array $args remaining file args. param: bool $forcedownload param: array $options additional options affecting the file serving. |
| question_page_type_list($pagetype, $parentcontext, $currentcontext) X-Ref |
| Return a list of page types param: string $pagetype current page type param: stdClass $parentcontext Block's parent context param: stdClass $currentcontext Current context of block return: array |
| question_module_uses_questions($modname) X-Ref |
| Does an activity module use the question bank? param: string $modname The name of the module (without mod_ prefix). return: bool true if the module uses questions. |
| core_question_find_next_unused_idnumber(?string $oldidnumber, int $categoryid) X-Ref |
| If $oldidnumber ends in some digits then return the next available idnumber of the same form. So idnum -> null (no digits at the end) idnum0099 -> idnum0100 (if that is unused, else whichever of idnum0101, idnume0102, ... is unused. idnum9 -> idnum10. param: string|null $oldidnumber a question idnumber, or can be null. param: int $categoryid a question category id. return: string|null suggested new idnumber for a question in that category, or null if one cannot be found. |
| get_question_bank_entry(int $questionid) X-Ref |
| Get the question_bank_entry object given a question id. param: int $questionid Question id. return: false|mixed |
| get_question_version($questionid) X-Ref |
| Get the question versions given a question id in a descending sort . param: int $questionid Question id. return: array |
| get_next_version(int $questionbankentryid) X-Ref |
| Get the next version number to create base on a Question bank entry id. param: int $questionbankentryid Question bank entry id. return: int next version number. |
| is_latest(string $version, string $questionbankentryid) X-Ref |
| Checks if question is the latest version. param: string $version Question version to check. param: string $questionbankentryid Entry to check against. return: bool |
| question_preview_url($questionid, $preferredbehaviour = null,$maxmark = null, $displayoptions = null, $variant = null, $context = null) X-Ref |
| Generate the URL for starting a new preview of a given question with the given options. param: integer $questionid the question to preview. param: string $preferredbehaviour the behaviour to use for the preview. param: float $maxmark the maximum to mark the question out of. param: question_display_options $displayoptions the display options to use. param: int $variant the variant of the question to preview. If null, one will param: object $context context to run the preview in (affects things like return: moodle_url the URL. |
| question_preview_popup_params() X-Ref |
| Popup params for the question preview. return: array that can be passed as $params to the {@see popup_action()} constructor. |
| question_hash($question) X-Ref |
| Creates a stamp that uniquely identifies this version of the question In future we want this to use a hash of the question data to guarantee that identical versions have the same version stamp. param: object $question return: string A unique version stamp |
| question_make_export_url($contextid, $categoryid, $format, $withcategories,$withcontexts, $filename) X-Ref |
| Create url for question export. param: int $contextid param: int $categoryid param: string $format param: string $withcategories param: string $withcontexts param: string $filename return: moodle_url export file url |
| question_get_export_single_question_url($question) X-Ref |
| Get the URL to export a single question (exportone.php). param: stdClass|question_definition $question the question definition as obtained from return: moodle_url the requested URL. |
| question_remove_stale_questions_from_category($categoryid) X-Ref |
| Remove stale questions from a category. While questions should not be left behind when they are not used any more, it does happen, maybe via restore, or old logic, or uncovered scenarios. When this happens, the users are unable to delete the question category unless they move those stale questions to another one category, but to them the category is empty as it does not contain anything. The purpose of this function is to detect the questions that may have gone stale and remove them. You will typically use this prior to checking if the category contains questions. The stale questions (unused and hidden to the user) handled are: - hidden questions - random questions param: int $categoryid The category ID. |
| flatten_category_tree(&$categories, $id, $depth = 0, $nochildrenof = -1) X-Ref |
| Private method, only for the use of add_indented_names(). Recursively adds an indentedname field to each category, starting with the category with id $id, and dealing with that category and all its children, and return a new array, with those categories in the right order. param: array $categories an array of categories which has had childids param: int $id the category to start the indenting process from. param: int $depth the indent depth. Used in recursive calls. param: int $nochildrenof return: array a new array of categories, in the right order for the tree. |
| add_indented_names($categories, $nochildrenof = -1) X-Ref |
| Format categories into an indented list reflecting the tree structure. param: array $categories An array of category objects, for example from the. param: int $nochildrenof return: array The formatted list of categories. |
| question_category_select_menu($contexts, $top = false, $currentcat = 0,$selected = "", $nochildrenof = -1) X-Ref |
| Output a select menu of question categories. Categories from this course and (optionally) published categories from other courses are included. Optionally, only categories the current user may edit can be included. param: array $contexts param: bool $top param: int $currentcat param: integer $selected optionally, the id of a category to be selected by param: int $nochildrenof |
| get_categories_for_contexts($contexts, $sortorder = 'parent, sortorder, name ASC', $top = false) X-Ref |
| Get all the category objects, including a count of the number of questions in that category, for all the categories in the lists $contexts. param: mixed $contexts either a single contextid, or a comma-separated list of context ids. param: string $sortorder used as the ORDER BY clause in the select statement. param: bool $top Whether to return the top categories or not. return: array of category objects. |
| question_category_options($contexts, $top = false, $currentcat = 0,$popupform = false, $nochildrenof = -1, $escapecontextnames = true) X-Ref |
| Output an array of question categories. param: array $contexts The list of contexts. param: bool $top Whether to return the top categories or not. param: int $currentcat param: bool $popupform param: int $nochildrenof param: boolean $escapecontextnames Whether the returned name of the thing is to be HTML escaped or not. return: array |
| question_add_context_in_key($categories) X-Ref |
| Add context in categories key. param: array $categories The list of categories. return: array |
| question_fix_top_names($categories, $escape = true) X-Ref |
| Finds top categories in the given categories hierarchy and replace their name with a proper localised string. param: array $categories An array of question categories. param: boolean $escape Whether the returned name of the thing is to be HTML escaped or not. return: array The same question category list given to the function, with the top category names being translated. |
