/**
     * Do the export
     * For most types this should not need to be overrided
     * @return stored_file
     */
    public function exportprocess() {
        global $CFG, $OUTPUT, $DB, $USER;

        // get the questions (from database) in this category
        // only get q's with no parents (no cloze subquestions specifically)
        if ($this->category) {
            $questions = get_questions_category($this->category, true);
        } else {
            $questions = $this->questions;
        }

        $count = 0;

        // results are first written into string (and then to a file)
        // so create/initialize the string here
        $expout = "";

        // track which category questions are in
        // if it changes we will record the category change in the output
        // file if selected. 0 means that it will get printed before the 1st question
        $trackcategory = 0;

        // iterate through questions
        foreach ($questions as $question) {
            // used by file api
            $contextid = $DB->get_field('question_categories', 'contextid',
                    array('id' => $question->category));
            $question->contextid = $contextid;

            // do not export hidden questions
            if (!empty($question->hidden)) {
                continue;
            }

            // do not export random questions
            if ($question->qtype == 'random') {
                continue;
            }

            // check if we need to record category change
            if ($this->cattofile) {
                if ($question->category != $trackcategory) {
                    $trackcategory = $question->category;
                    $categoryname = $this->get_category_path($trackcategory, $this->contexttofile);

                    // create 'dummy' question for category export
                    $dummyquestion = new stdClass();
                    $dummyquestion->qtype = 'category';
                    $dummyquestion->category = $categoryname;
                    $dummyquestion->name = 'Switch category to ' . $categoryname;
                    $dummyquestion->id = 0;
                    $dummyquestion->questiontextformat = '';
                    $dummyquestion->contextid = 0;
                    $expout .= $this->writequestion($dummyquestion) . "\n";
                }
            }

            // export the question displaying message
            $count++;

            if (question_has_capability_on($question, 'view', $question->category)) {
                $expout .= $this->writequestion($question, $contextid) . "\n";
            }
        }

        // continue path for following error checks
        $course = $this->course;
        $continuepath = "$CFG->wwwroot/question/export.php?courseid=$course->id";

        // did we actually process anything
        if ($count==0) {
            print_error('noquestions', 'question', $continuepath);
        }

        // final pre-process on exported data
        $expout = $this->presave_process($expout);
        return $expout;
    }

 /**
  * exports the questions in a question category to the given location
  *
  * The parent class method was overridden because the IMS export consists of multiple files
  *
  * @param string $filename the directory name which will hold the exported files
  * @return bool - or errors out
  */
 public function exportprocess()
 {
     global $CFG, $OUTPUT, $USER;
     $courseid = $this->course->id;
     $path = 'temp/qformat_qti_two/' . $USER->id . '/' . $this->filename;
     // create a directory for the exports (if not already existing)
     if (!make_upload_directory($path)) {
         throw new moodle_exception('cannotcreatepath', 'question', '', $path);
     }
     $path = $CFG->dataroot . '/' . $path;
     // get the questions (from database) in this category
     $questions = get_questions_category($this->category);
     // create the imsmanifest file
     $smarty =& $this->init_smarty();
     $this->add_qti_info($questions);
     // copy files used by the main questions to the export directory
     $result = $this->handle_questions_media($questions, $path, $courseid);
     if ($result !== true) {
         throw new coding_exception(implode("<br />", $result));
     }
     $manifestquestions = $this->objects_to_array($questions);
     $manifestid = str_replace(array(':', '/'), array('-', '_'), "question_category_{$this->category->id}---{$CFG->wwwroot}");
     $smarty->assign('externalfiles', 1);
     $smarty->assign('manifestidentifier', $manifestid);
     $smarty->assign('quiztitle', "question_category_{$this->category->id}");
     $smarty->assign('quizinfo', "All questions in category {$this->category->id}");
     $smarty->assign('questions', $manifestquestions);
     $smarty->assign('lang', $this->lang);
     $smarty->error_reporting = 99;
     $expout = $smarty->fetch('imsmanifest.tpl');
     $filepath = $path . '/imsmanifest.xml';
     if (empty($expout)) {
         print_error('emptyxml', 'question');
     }
     if (!($fh = fopen($filepath, "w"))) {
         print_error('cannotopenforwriting', 'question', '', $filepath);
     }
     if (!fwrite($fh, $expout)) {
         print_error('cannotwriteto', 'question', '', $filepath);
     }
     fclose($fh);
     // iterate through questions
     foreach ($questions as $question) {
         // results are first written into string (and then to a file)
         $expout = $this->writequestion($question, null, true, $path) . "\n";
         $expout = $this->presave_process($expout);
         $filepath = $path . '/' . $this->get_assesment_item_id($question) . ".xml";
         if (!($fh = fopen($filepath, "w"))) {
             print_error('cannotopenforwriting', 'question', '', $filepath);
         }
         if (!fwrite($fh, $expout)) {
             print_error('cannotwriteto', 'question', '', $filepath);
         }
         fclose($fh);
     }
     // zip files into single export file
     zip_files(array($path), "{$path}.zip");
     // remove the temporary directory
     remove_dir($path);
     return true;
 }

 /**
  * Do the export
  * For most types this should not need to be overrided
  * @return boolean success
  */
 function exportprocess()
 {
     global $CFG;
     // create a directory for the exports (if not already existing)
     if (!($export_dir = make_upload_directory($this->question_get_export_dir()))) {
         error(get_string('cannotcreatepath', 'quiz', $export_dir));
     }
     $path = $CFG->dataroot . '/' . $this->question_get_export_dir();
     // get the questions (from database) in this category
     // only get q's with no parents (no cloze subquestions specifically)
     if ($this->category) {
         $questions = get_questions_category($this->category, true);
     } else {
         $questions = $this->questions;
     }
     notify(get_string('exportingquestions', 'quiz'));
     $count = 0;
     // results are first written into string (and then to a file)
     // so create/initialize the string here
     $expout = "";
     // track which category questions are in
     // if it changes we will record the category change in the output
     // file if selected. 0 means that it will get printed before the 1st question
     $trackcategory = 0;
     // iterate through questions
     foreach ($questions as $question) {
         // do not export hidden questions
         if (!empty($question->hidden)) {
             continue;
         }
         // do not export random questions
         if ($question->qtype == RANDOM) {
             continue;
         }
         // check if we need to record category change
         if ($this->cattofile) {
             if ($question->category != $trackcategory) {
                 $trackcategory = $question->category;
                 $categoryname = $this->get_category_path($trackcategory, '/', $this->contexttofile);
                 // create 'dummy' question for category export
                 $dummyquestion = new object();
                 $dummyquestion->qtype = 'category';
                 $dummyquestion->category = $categoryname;
                 $dummyquestion->name = "switch category to {$categoryname}";
                 $dummyquestion->id = 0;
                 $dummyquestion->questiontextformat = '';
                 $expout .= $this->writequestion($dummyquestion) . "\n";
             }
         }
         // export the question displaying message
         $count++;
         echo "<hr /><p><b>{$count}</b>. " . $this->format_question_text($question) . "</p>";
         if (question_has_capability_on($question, 'view', $question->category)) {
             $expout .= $this->writequestion($question) . "\n";
         }
     }
     // continue path for following error checks
     $course = $this->course;
     $continuepath = "{$CFG->wwwroot}/question/export.php?courseid={$course->id}";
     // did we actually process anything
     if ($count == 0) {
         print_error('noquestions', 'quiz', $continuepath);
     }
     // final pre-process on exported data
     $expout = $this->presave_process($expout);
     // write file
     $filepath = $path . "/" . $this->filename . $this->export_file_extension();
     if (!($fh = fopen($filepath, "w"))) {
         print_error('cannotopen', 'quiz', $continuepath, $filepath);
     }
     if (!fwrite($fh, $expout, strlen($expout))) {
         print_error('cannotwrite', 'quiz', $continuepath, $filepath);
     }
     fclose($fh);
     return true;
 }

include $CFG->dirroot . "/mod/{$cm->modname}/tabs.php";
$exportfilename = default_export_filename($COURSE, $category);
$export_form = new question_export__good_questions_form($thispageurl, array('contexts' => array($contexts->lowest()), 'defaultcategory' => $pagevars['cat'], 'defaultfilename' => $exportfilename, 'qcreate' => $qcreate));
if ($from_form = $export_form->get_data()) {
    /// Filename
    if (!is_readable($CFG->dirroot . "/question/format/{$from_form->format}/format.php")) {
        error("Format not known ({$from_form->format})");
    }
    // load parent class for import/export
    require_once $CFG->dirroot . "/question/format.php";
    // and then the class for the selected format
    require_once $CFG->dirroot . "/question/format/{$from_form->format}/format.php";
    $classname = "qformat_{$from_form->format}";
    $qformat = new $classname();
    $qformat->setContexts($contexts->having_one_edit_tab_cap('export'));
    $questions = get_questions_category($category, true);
    if ($qcreate->graderatio != 100 && $from_form->betterthangrade != 0) {
        //filter questions by grade
        $qkeys = array();
        foreach ($questions as $question) {
            $qkeys[] = $question->id;
        }
        $questionlist = join($qkeys, ',');
        $sql = 'SELECT questionid, grade FROM ' . $CFG->prefix . 'qcreate_grades ' . 'WHERE questionid IN (' . $questionlist . ') AND grade >= ' . $from_form->betterthangrade;
        if ($goodquestions = get_records_sql($sql)) {
            foreach ($questions as $zbkey => $question) {
                if (!array_key_exists($question->id, $goodquestions)) {
                    unset($questions[$zbkey]);
                }
            }
        } else {

 public function get_questions($category, $include_category = false, $include_hidden = false)
 {
     $result = array();
     $questions = get_questions_category($category);
     foreach ($questions as $question) {
         if ((!$question->hidden || $include_category) && ($question->parent == 0 || $include_hidden)) {
             $result[] = $question;
         }
     }
     return $result;
 }

 /**
  * exports the questions in a question category to the given location
  *
  * The parent class method was overridden because the IMS export consists of multiple files
  *
  * @param string $filename the directory name which will hold the exported files
  * @return bool - or errors out
  */
 public function exportprocess()
 {
     global $CFG, $OUTPUT, $USER, $DB;
     $courseid = $this->course->id;
     // Continue path for following error checks.
     $continuepath = "{$CFG->wwwroot}/question/export.php?courseid={$courseid}";
     // Create a temporary directory for the exports (if not already existing).
     $uniquecode = time();
     $this->tempdir = 'qformat_qtitwo/' . $USER->id . '/' . $uniquecode;
     if (!($path = make_temp_directory($this->tempdir))) {
         throw new moodle_exception('cannotcreatepath', 'question', '', $path);
         print_error('cannotcreatepath', 'quiz', '', $continuepath);
     }
     // Get the questions (from database) in this category.
     $questions = get_questions_category($this->category);
     $count = 0;
     // Create the imsmanifest file.
     $smarty =& $this->init_smarty();
     $this->add_qti_info($questions);
     $manifestquestions = $this->objects_to_array($questions);
     $manifestid = str_replace(array(':', '/'), array('-', '_'), "question_category_{$this->category->id}---{$CFG->wwwroot}");
     $smarty->assign('externalfiles', 1);
     $smarty->assign('manifestidentifier', $manifestid);
     $smarty->assign('quiztitle', "question_category_{$this->category->id}");
     $smarty->assign('quizinfo', "All questions in category {$this->category->id}");
     $smarty->assign('questions', $manifestquestions);
     $smarty->assign('lang', $this->lang);
     $smarty->error_reporting = 99;
     $expout = $smarty->fetch('imsmanifest.tpl');
     $filepath = $path . '/imsmanifest.xml';
     if (empty($expout)) {
         print_error('emptyxml', 'question', $continuepath);
     }
     if (!($fh = fopen($filepath, "w"))) {
         print_error('cannotopenforwriting', 'question', '', $continuepath);
     }
     if (!fwrite($fh, $expout)) {
         print_error('cannotwriteto', 'question', '', $continuepath);
     }
     fclose($fh);
     $this->xml_entitize($questions);
     // Iterate through questions.
     foreach ($questions as $question) {
         // Do not export hidden questions.
         if (!empty($question->hidden)) {
             continue;
         }
         // Do not export random questions.
         if ($question->qtype == 'random') {
             continue;
         }
         // used by file api
         $contextid = $DB->get_field('question_categories', 'contextid', array('id' => $question->category));
         $question->contextid = $contextid;
         // Results are first written into string (and then to a file).
         $count++;
         $expout = $this->writequestion($question, null, true, $path) . "\n";
         $expout = $this->presave_process($expout);
         $filepath = $path . '/' . $this->get_assesment_item_id($question) . ".xml";
         if (!($fh = fopen($filepath, "w"))) {
             print_error('cannotopenforwriting', 'question', '', $continuepath);
         }
         if (!fwrite($fh, $expout)) {
             print_error('cannotwriteto', 'question', '', $continuepath);
         }
         fclose($fh);
     }
     $this->copy_resources($questions, $this->tempdir);
     // Get the list of files in directory.
     $filestemp = get_directory_list($path, '', false, true, true);
     $files = array();
     foreach ($filestemp as $file) {
         // Add zip paths and fs paths to all them.
         $files[$file] = $path . '/' . $file;
     }
     // Get the zip packer.
     $zippacker = get_file_packer('application/zip');
     // Zip files.
     $zipfile = $path . ' /qti2.zip';
     $zippacker->archive_to_pathname($files, $zipfile);
     $zipcontent = file_get_contents($zipfile);
     // Remove the temporary directory.
     fulldelete($path);
     return $zipcontent;
 }

 /**
  * Returns welcome message
  * @return string welcome message
  */
 public static function get_quiz()
 {
     global $USER, $DB, $CFG;
     $randomcolors = array('green', 'yellow', 'blue', 'red', 'purple');
     $randomicons = array('entertainment', 'sports', 'music', 'tvmovies', 'science', 'geography', 'history', 'knowledge', 'food');
     $randomsingletypes = array('single-select-item', 'single-select');
     //Parameter validation
     $params = self::validate_parameters(self::get_quiz_parameters(), array());
     //Context validation
     //self::validate_context(context_user::get_instance($USER->id));
     //Capability checking
     //if (!has_capability('moodle/user:viewdetails', $context)) {
     //   throw new moodle_exception('cannotviewprofile');
     //}
     $courses = enrol_get_users_courses($USER->id, true, 'id, shortname, fullname, idnumber, visible');
     $result = array();
     foreach ($courses as $course) {
         // Find all questions the user is allowed to see
         $coursecontext = context_course::instance($course->id);
         $questions = array();
         require_once $CFG->dirroot . "/question/editlib.php";
         $category = question_get_default_category($coursecontext->id);
         $catquestions = get_questions_category($category);
         // only keep multichoice yet.
         foreach ($catquestions as $question) {
             if ($question->qtype == "multichoice") {
                 $questions[$question->id] = $question;
             }
         }
         if (!empty($questions)) {
             // pick random theme color and icon.
             $color = $randomcolors[array_rand($randomcolors)];
             $icon = $randomicons[array_rand($randomicons)];
             $quizresult = new stdClass();
             $quizresult->name = $course->shortname;
             $quizresult->id = $icon;
             $quizresult->theme = $color;
             $quizresult->quizzes = array();
             // Only get 8 questions maxim
             $i = 0;
             foreach ($questions as $question) {
                 if ($i < 8) {
                     $i++;
                     // Convert them into JSON expected code
                     $questionresult = new stdClass();
                     $questionresult->question = clean_param($question->questiontext, PARAM_TEXT);
                     $questionresult->options = array();
                     $answernum = 0;
                     $jsonanswer = array();
                     foreach ($question->options->answers as $answer) {
                         // Find out if the answer is the correct one (obviouly we don't support multiple answer yet)
                         if ($answer->fraction > 0) {
                             $jsonanswer[] = $answernum;
                         }
                         $questionresult->options[] = clean_param($answer->answer, PARAM_TEXT);
                         $answernum++;
                     }
                     // Detect moodeka quiz type.
                     if (count($jsonanswer) > 1) {
                         $type = 'multi-select';
                     } else {
                         if ($answernum == 4 and rand(0, 1)) {
                             $type = 'four-quarter';
                         } else {
                             $type = $randomsingletypes[array_rand($randomsingletypes)];
                         }
                     }
                     $questionresult->answer = $jsonanswer;
                     $questionresult->type = $type;
                     $quizresult->quizzes[] = $questionresult;
                 }
             }
             $result[] = $quizresult;
         }
     }
     return $result;
 }