PHP get_context_instance_by_id函数代码示例

 /**
  * Retrieve a file for a user of the Moodle client calling this function
  * The file is encoded in base64
  * @global <type> $DB
  * @global <type> $USER
  * @global <type> $MNET_REMOTE_CLIENT
  * @param <type> $username
  * @param <type> $source
  * @return <type>
  */
 public function retrieveFile($username, $source)
 {
     global $DB, $USER, $MNET_REMOTE_CLIENT;
     ///check the the user is known
     ///he has to be previously connected to the server site in order to be in the database
     //TODO: this seems weird - is it executed from cron or what? Please review
     $USER = $DB->get_record('user', array('username' => $username, 'mnethostid' => $MNET_REMOTE_CLIENT->id));
     if (empty($USER)) {
         exit(mnet_server_fault(9016, get_string('usernotfound', 'repository_remotemoodle', $username)));
     }
     $file = unserialize(base64_decode($source));
     $contextid = $file[0];
     $filearea = $file[1];
     $itemid = $file[2];
     $filepath = $file[3];
     $filename = $file[4];
     ///check that the user has read permission on this file
     $browser = get_file_browser();
     $fileinfo = $browser->get_file_info(get_context_instance_by_id($contextid), $filearea, $itemid, $filepath, $filename);
     if (empty($fileinfo)) {
         exit(mnet_server_fault(9016, get_string('usercannotaccess', 'repository_remotemoodle', $file)));
     }
     ///retrieve the file with file API functions and return it encoded in base64
     $fs = get_file_storage();
     $sf = $fs->get_file($contextid, $filearea, $itemid, $filepath, $filename);
     $contents = base64_encode($sf->get_content());
     return array($contents, $sf->get_filename());
 }

 public function role_unassigned($ra)
 {
     global $DB;
     // note: do not test if plugin enabled, we want to keep removing previous roles
     // prevent circular dependencies - we can not sync meta roles recursively
     if ($ra->component === 'enrol_meta') {
         return true;
     }
     // only course level roles are interesting
     $parentcontext = get_context_instance_by_id($ra->contextid);
     if ($parentcontext->contextlevel != CONTEXT_COURSE) {
         return true;
     }
     // does anything want to sync with this parent?
     if (!($enrols = $DB->get_records('enrol', array('customint1' => $parentcontext->instanceid, 'enrol' => 'meta'), 'id ASC'))) {
         return true;
     }
     // note: do not check 'nosyncroleids', somebody might have just enabled it, we want to get rid of nosync roles gradually
     foreach ($enrols as $enrol) {
         // Is the user enrolled? We want to sync only really enrolled users
         if (!$DB->record_exists('user_enrolments', array('userid' => $ra->userid, 'enrolid' => $enrol->id))) {
             continue;
         }
         $context = get_context_instance(CONTEXT_COURSE, $enrol->courseid);
         // now make sure the user does not have the role through some other enrol plugin
         $params = array('contextid' => $ra->contextid, 'roleid' => $ra->roleid, 'userid' => $ra->userid);
         if ($DB->record_exists_select('role_assignments', "contextid = :contextid AND roleid = :roleid AND userid = :userid AND component <> 'enrol_meta'", $params)) {
             continue;
         }
         // unassign role, there is no other role assignment in parent course
         role_unassign($ra->roleid, $ra->userid, $context->id, 'enrol_meta', $enrol->id);
     }
     return true;
 }

/**
 * Form for editing HTML block instances.
 *
 * @copyright 2010 Petr Skoda (http://skodak.org)
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @package   block_html
 * @category  files
 * @param stdClass $course course object
 * @param stdClass $birecord_or_cm block instance record
 * @param stdClass $context context object
 * @param string $filearea file area
 * @param array $args extra arguments
 * @param bool $forcedownload whether or not force download
 * @param array $options additional options affecting the file serving
 * @return bool
 */
function block_html_pluginfile($course, $birecord_or_cm, $context, $filearea, $args, $forcedownload, array $options = array())
{
    global $SCRIPT;
    if ($context->contextlevel != CONTEXT_BLOCK) {
        send_file_not_found();
    }
    require_course_login($course);
    if ($filearea !== 'content') {
        send_file_not_found();
    }
    $fs = get_file_storage();
    $filename = array_pop($args);
    $filepath = $args ? '/' . implode('/', $args) . '/' : '/';
    if (!($file = $fs->get_file($context->id, 'block_html', 'content', 0, $filepath, $filename)) or $file->is_directory()) {
        send_file_not_found();
    }
    if ($parentcontext = get_context_instance_by_id($birecord_or_cm->parentcontextid)) {
        if ($parentcontext->contextlevel == CONTEXT_USER) {
            // force download on all personal pages including /my/
            //because we do not have reliable way to find out from where this is used
            $forcedownload = true;
        }
    } else {
        // weird, there should be parent context, better force dowload then
        $forcedownload = true;
    }
    session_get_instance()->write_close();
    send_stored_file($file, 60 * 60, 0, $forcedownload, $options);
}

 /**
  * Add question-type specific form fields.
  *
  * @param MoodleQuickForm $mform the form being built.
  */
 function question_dataset_dependent_items_form($submiturl, $question, $regenerate)
 {
     global $QTYPES, $SESSION, $CFG, $DB;
     $this->regenerate = $regenerate;
     $this->question = $question;
     $this->qtypeobj =& $QTYPES[$this->question->qtype];
     // Validate the question category.
     if (!($category = $DB->get_record('question_categories', array('id' => $question->category)))) {
         print_error('categorydoesnotexist', 'question', $returnurl);
     }
     $this->category = $category;
     $this->categorycontext = get_context_instance_by_id($category->contextid);
     //get the dataset defintions for this question
     if (empty($question->id)) {
         $this->datasetdefs = $this->qtypeobj->get_dataset_definitions($question->id, $SESSION->calculated->definitionform->dataset);
     } else {
         if (empty($question->options)) {
             $this->get_question_options($question);
         }
         $this->datasetdefs = $this->qtypeobj->get_dataset_definitions($question->id, array());
     }
     foreach ($this->datasetdefs as $datasetdef) {
         // Get maxnumber
         if ($this->maxnumber == -1 || $datasetdef->itemcount < $this->maxnumber) {
             $this->maxnumber = $datasetdef->itemcount;
         }
     }
     foreach ($this->datasetdefs as $defid => $datasetdef) {
         if (isset($datasetdef->id)) {
             $this->datasetdefs[$defid]->items = $this->qtypeobj->get_database_dataset_items($datasetdef->id);
         }
     }
     parent::moodleform($submiturl);
 }

 function definition()
 {
     global $CFG, $DB;
     $mform = $this->_form;
     $course = $this->_customdata;
     $coursecontext = context_course::instance($course->id);
     $enrol = enrol_get_plugin('cohort');
     $cohorts = array('' => get_string('choosedots'));
     list($sqlparents, $params) = $DB->get_in_or_equal(get_parent_contexts($coursecontext));
     $sql = "SELECT id, name, contextid\n                  FROM {cohort}\n                 WHERE contextid {$sqlparents}\n              ORDER BY name ASC";
     $rs = $DB->get_recordset_sql($sql, $params);
     foreach ($rs as $c) {
         $context = get_context_instance_by_id($c->contextid);
         if (!has_capability('moodle/cohort:view', $context)) {
             continue;
         }
         $cohorts[$c->id] = format_string($c->name);
     }
     $rs->close();
     $roles = get_assignable_roles($coursecontext);
     $roles[0] = get_string('none');
     $roles = array_reverse($roles, true);
     // descending default sortorder
     $mform->addElement('header', 'general', get_string('pluginname', 'enrol_cohort'));
     $mform->addElement('select', 'cohortid', get_string('cohort', 'cohort'), $cohorts);
     $mform->addRule('cohortid', get_string('required'), 'required', null, 'client');
     $mform->addElement('select', 'roleid', get_string('role'), $roles);
     $mform->addRule('roleid', get_string('required'), 'required', null, 'client');
     $mform->setDefault('roleid', $enrol->get_config('roleid'));
     $mform->addElement('hidden', 'id', null);
     $mform->setType('id', PARAM_INT);
     $this->add_action_buttons(true, get_string('addinstance', 'enrol'));
     $this->set_data(array('id' => $course->id));
 }

/**
 * Callback function called from question_list() function
 * (which is called from showbank())
 */
function module_specific_controls($totalnumber, $recurse, $category, $cmid, $cmoptions)
{
    global $QTYPES, $OUTPUT;
    $out = '';
    $catcontext = get_context_instance_by_id($category->contextid);
    if (has_capability('moodle/question:useall', $catcontext)) {
        if ($cmoptions->hasattempts) {
            $disabled = 'disabled="disabled"';
        } else {
            $disabled = '';
        }
        $randomusablequestions = $QTYPES['random']->get_usable_questions_from_category($category->id, $recurse, '0');
        $maxrand = count($randomusablequestions);
        if ($maxrand > 0) {
            for ($i = 1; $i <= min(10, $maxrand); $i++) {
                $randomcount[$i] = $i;
            }
            for ($i = 20; $i <= min(100, $maxrand); $i += 10) {
                $randomcount[$i] = $i;
            }
            $straddtoquiz = get_string('addtoquiz', 'quiz');
            $out = '<strong><label for="menurandomcount">' . get_string('addrandomfromcategory', 'quiz') . '</label></strong><br />';
            $select = html_select::make($randomcount, 'randomcount', '1', false);
            $select->nothingvalue = '';
            $select->disabled = $cmoptions->hasattempts;
            $out .= get_string('addrandom', 'quiz', $OUTPUT->select($select));
            $out .= '<input type="hidden" name="recurse" value="' . $recurse . '" />';
            $out .= '<input type="hidden" name="categoryid" value="' . $category->id . '" />';
            $out .= ' <input type="submit" name="addrandom" value="' . $straddtoquiz . '" ' . $disabled . ' />';
            $out .= $OUTPUT->help_icon(moodle_help_icon::make('random', get_string('random', 'quiz'), 'quiz'));
        }
    }
    return $out;
}

 /**
  * Handle a role assignment by creating an equivalent class enrolment or
  * instructor assignment (if applicable).
  */
 static function role_assigned($data)
 {
     require_once CURMAN_DIRLOCATION . '/lib/student.class.php';
     require_once CURMAN_DIRLOCATION . '/lib/instructor.class.php';
     global $CURMAN;
     if (!($context = get_context_instance_by_id($data->contextid))) {
         $context = get_context_instance($data->contextid, $data->itemid);
     }
     if (!empty($context) && $context->contextlevel == context_level_base::get_custom_context_level('class', 'block_curr_admin')) {
         $cmuserid = cm_get_crlmuserid($data->userid);
         if ($data->roleid == $CURMAN->config->enrolment_role_sync_student_role) {
             // add enrolment record
             $student = new student();
             $student->userid = $cmuserid;
             $student->classid = $context->instanceid;
             // NOTE: student::add checks if the student is already
             // enrolled, so we don't have to check here
             $student->add();
         }
         if ($data->roleid == $CURMAN->config->enrolment_role_sync_instructor_role) {
             // add instructor record
             if (!instructor::user_is_instructor_of_class($cmuserid, $context->instanceid)) {
                 $instructor = new instructor();
                 $instructor->userid = $cmuserid;
                 $instructor->classid = $context->instanceid;
                 $instructor->add();
             }
         }
     }
     return true;
 }

/**
 * Callback function called from question_list() function (which is called from showbank())
 */
function module_specific_controls($totalnumber, $recurse, $category, $cmid)
{
    global $QTYPES;
    $out = '';
    $catcontext = get_context_instance_by_id($category->contextid);
    if (has_capability('moodle/question:useall', $catcontext)) {
        $randomusablequestions = $QTYPES['random']->get_usable_questions_from_category($category->id, $recurse, '0');
        $maxrand = count($randomusablequestions);
        if ($maxrand > 0) {
            for ($i = 1; $i <= min(10, $maxrand); $i++) {
                $randomcount[$i] = $i;
            }
            for ($i = 20; $i <= min(100, $maxrand); $i += 10) {
                $randomcount[$i] = $i;
            }
            $out .= '<br />';
            $out .= get_string('addrandom', 'quiz', choose_from_menu($randomcount, 'randomcount', '1', '', '', '', true));
            $out .= '<input type="hidden" name="recurse" value="' . $recurse . '" />';
            $out .= '<input type="hidden" name="categoryid" value="' . $category->id . '" />';
            $out .= ' <input type="submit" name="addrandom" value="' . get_string('add') . '" />';
            $out .= helpbutton('random', get_string('random', 'quiz'), 'quiz', true, false, '', true);
        }
    }
    return $out;
}

 function definition()
 {
     $mform =& $this->_form;
     // First show fields specific to this type of block.
     $this->specific_definition($mform);
     // Then show the fields about where this block appears.
     $mform->addElement('header', 'whereheader', get_string('wherethisblockappears', 'block'));
     // If the current weight of the block is out-of-range, add that option in.
     $blockweight = $this->block->instance->weight;
     $weightoptions = array();
     if ($blockweight < -block_manager::MAX_WEIGHT) {
         $weightoptions[$blockweight] = $blockweight;
     }
     for ($i = -block_manager::MAX_WEIGHT; $i <= block_manager::MAX_WEIGHT; $i++) {
         $weightoptions[$i] = $i;
     }
     if ($blockweight > block_manager::MAX_WEIGHT) {
         $weightoptions[$blockweight] = $blockweight;
     }
     $first = reset($weightoptions);
     $weightoptions[$first] = get_string('bracketfirst', 'block', $first);
     $last = end($weightoptions);
     $weightoptions[$last] = get_string('bracketlast', 'block', $last);
     $regionoptions = $this->page->theme->get_all_block_regions();
     $parentcontext = get_context_instance_by_id($this->block->instance->parentcontextid);
     $mform->addElement('static', 'contextname', get_string('thisblockbelongsto', 'block'), print_context_name($parentcontext));
     $mform->addElement('selectyesno', 'bui_showinsubcontexts', get_string('appearsinsubcontexts', 'block'));
     $pagetypeoptions = matching_page_type_patterns($this->page->pagetype);
     $pagetypeoptions = array_combine($pagetypeoptions, $pagetypeoptions);
     $mform->addElement('select', 'bui_pagetypepattern', get_string('pagetypes', 'block'), $pagetypeoptions);
     if ($this->page->subpage) {
         $subpageoptions = array('%@NULL@%' => get_string('anypagematchingtheabove', 'block'), $this->page->subpage => get_string('thisspecificpage', 'block', $this->page->subpage));
         $mform->addElement('select', 'bui_subpagepattern', get_string('subpages', 'block'), $subpageoptions);
     }
     $defaultregionoptions = $regionoptions;
     $defaultregion = $this->block->instance->defaultregion;
     if (!array_key_exists($defaultregion, $defaultregionoptions)) {
         $defaultregionoptions[$defaultregion] = $defaultregion;
     }
     $mform->addElement('select', 'bui_defaultregion', get_string('defaultregion', 'block'), $defaultregionoptions);
     $mform->addElement('select', 'bui_defaultweight', get_string('defaultweight', 'block'), $weightoptions);
     // Where this block is positioned on this page.
     $mform->addElement('header', 'whereheader', get_string('onthispage', 'block'));
     $mform->addElement('selectyesno', 'bui_visible', get_string('visible', 'block'));
     $blockregion = $this->block->instance->region;
     if (!array_key_exists($blockregion, $regionoptions)) {
         $regionoptions[$blockregion] = $blockregion;
     }
     $mform->addElement('select', 'bui_region', get_string('region', 'block'), $regionoptions);
     $mform->addElement('select', 'bui_weight', get_string('weight', 'block'), $weightoptions);
     $pagefields = array('bui_visible', 'bui_region', 'bui_weight');
     if (!$this->block->user_can_edit()) {
         $mform->hardFreezeAllVisibleExcept($pagefields);
     }
     if (!$this->page->user_can_edit_blocks()) {
         $mform->hardFreeze($pagefields);
     }
     $this->add_action_buttons();
 }

 /**
  * Get file listing
  *
  * @param string $encodedpath
  * @return mixed
  */
 public function get_listing($encodedpath = '', $page = '')
 {
     global $CFG, $USER, $OUTPUT;
     $ret = array();
     $ret['dynload'] = true;
     $ret['nosearch'] = true;
     $ret['nologin'] = true;
     $list = array();
     if (!empty($encodedpath)) {
         $params = unserialize(base64_decode($encodedpath));
         if (is_array($params)) {
             $component = is_null($params['component']) ? NULL : clean_param($params['component'], PARAM_COMPONENT);
             $filearea = is_null($params['filearea']) ? NULL : clean_param($params['filearea'], PARAM_AREA);
             $itemid = is_null($params['itemid']) ? NULL : clean_param($params['itemid'], PARAM_INT);
             $filepath = is_null($params['filepath']) ? NULL : clean_param($params['filepath'], PARAM_PATH);
             $filename = is_null($params['filename']) ? NULL : clean_param($params['filename'], PARAM_FILE);
             $context = get_context_instance_by_id(clean_param($params['contextid'], PARAM_INT));
         }
     } else {
         $itemid = null;
         $filename = null;
         $filearea = null;
         $filepath = null;
         $component = null;
         if (!empty($this->context)) {
             list($context, $course, $cm) = get_context_info_array($this->context->id);
             if (is_object($course)) {
                 $context = get_context_instance(CONTEXT_COURSE, $course->id);
             } else {
                 $context = get_system_context();
             }
         } else {
             $context = get_system_context();
         }
     }
     $browser = get_file_browser();
     $list = array();
     if ($fileinfo = $browser->get_file_info($context, $component, $filearea, $itemid, $filepath, $filename)) {
         // build file tree
         $element = repository_local_file::retrieve_file_info($fileinfo, $this);
         $nonemptychildren = $element->get_non_empty_children();
         foreach ($nonemptychildren as $child) {
             $list[] = (array) $child->get_node();
         }
     } else {
         // if file doesn't exist, build path nodes root of current context
         $fileinfo = $browser->get_file_info($context, null, null, null, null, null);
     }
     // build path navigation
     $ret['path'] = array();
     $element = repository_local_file::retrieve_file_info($fileinfo, $this);
     for ($level = $element; $level; $level = $level->get_parent()) {
         if ($level == $element || !$level->can_skip()) {
             array_unshift($ret['path'], $level->get_node_path());
         }
     }
     $ret['list'] = array_filter($list, array($this, 'filter'));
     return $ret;
 }

function qtype_ddmarker_course_context_id($catcontextid)
{
    $context = get_context_instance_by_id($catcontextid);
    while ($context->contextlevel != CONTEXT_COURSE) {
        $context = get_context_instance_by_id(get_parent_contextid($context));
    }
    return $context->id;
}

 function question_edit_form($submiturl, $question, $category, $contexts, $formeditable = true)
 {
     $this->question = $question;
     $this->contexts = $contexts;
     $this->category = $category;
     $this->categorycontext = get_context_instance_by_id($category->contextid);
     //course id or site id depending on question cat context
     $this->coursefilesid = get_filesdir_from_context(get_context_instance_by_id($category->contextid));
     parent::moodleform($submiturl, null, 'post', '', null, $formeditable);
 }

 /**
  * Add question-type specific form fields.
  *
  * @param MoodleQuickForm $mform the form being built.
  */
 public function __construct($submiturl, $question) {
     global $DB;
     $this->question = $question;
     $this->qtypeobj = question_bank::get_qtype($this->question->qtype);
     // Validate the question category.
     if (!$category = $DB->get_record('question_categories',
             array('id' => $question->category))) {
         print_error('categorydoesnotexist', 'question', $returnurl);
     }
     $this->category = $category;
     $this->categorycontext = get_context_instance_by_id($category->contextid);
     parent::__construct($submiturl);
 }

 public function __construct($submiturl, $question, $category, $contexts, $formeditable = true)
 {
     global $DB;
     $this->question = $question;
     $this->contexts = $contexts;
     $record = $DB->get_record('question_categories', array('id' => $question->category), 'contextid');
     $this->context = get_context_instance_by_id($record->contextid);
     $this->editoroptions = array('subdirs' => 1, 'maxfiles' => EDITOR_UNLIMITED_FILES, 'context' => $this->context);
     $this->fileoptions = array('subdirs' => 1, 'maxfiles' => -1, 'maxbytes' => -1);
     $this->category = $category;
     $this->categorycontext = get_context_instance_by_id($category->contextid);
     parent::__construct($submiturl, null, 'post', '', null, $formeditable);
 }

 /**
  * Add question-type specific form fields.
  *
  * @param MoodleQuickForm $mform the form being built.
  */
 function question_dataset_dependent_definitions_form($submiturl, $question)
 {
     global $QTYPES;
     $this->question = $question;
     $this->qtypeobj =& $QTYPES[$this->question->qtype];
     // Validate the question category.
     if (!($category = get_record('question_categories', 'id', $question->category))) {
         print_error('categorydoesnotexist', 'question', $returnurl);
     }
     $this->category = $category;
     $this->categorycontext = get_context_instance_by_id($category->contextid);
     parent::moodleform($submiturl);
 }