docs/include/classes/testQuestions.class.php

   1 <?php
   2 /************************************************************************/
   3 /* AContent                                                             */
   4 /************************************************************************/
   5 /* Copyright (c) 2010                                                   */
   6 /* Inclusive Design Institute                                           */
   7 /*                                                                      */
   8 /* This program is free software. You can redistribute it and/or        */
   9 /* modify it under the terms of the GNU General Public License          */
  10 /* as published by the Free Software Foundation.                        */
  11 /************************************************************************/
  12
  13 require_once(TR_INCLUDE_PATH.'lib/test_question_queries.inc.php');
  14
  15 /*
  16  * Steps to follow when adding a new question type:
  17  *
  18  * 1 - Create a class extending AbstractQuestion or extend an
  19  *     existing question class.
  20  *     Define $sPrefix and $sNameVar appropriately.
  21  *     Implement the following methods, which set template variables:
  22  *
  23  *        assignQTIVariables()
  24  *        assignDisplayResultVariables()
  25  *        assignDisplayVariables()
  26  *        assignDisplayStatisticsVariables()
  27  *                importQti()
  28  *
  29  *     And implement mark() which is used for marking the result.
  30  *
  31  * 2 - Add the new class name to $question_classes in test_question_factory()
  32  *
  33  * 3 - Add $sNameVar to the language database.
  34  *
  35  * 4 - Create the following files for creating and editing the question,
  36  *     where "{PREFIX}" is the value defined by $sPrefix:
  37  *
  38  *     /tools/tests/create_question_{PREFIX}.php
  39  *     /tools/tests/edit_question_{PREFIX}.php
  40  *
  41  * 5 - Add those two newly created pages to
  42  *     /tests/module.php
  43  *
  44  * 6 - Create the following template files:
  45  *
  46  *     /themes/default/tests/test_questions/{PREFIX}.tmpl.php
  47  *     /themes/default/tests/test_questions/{PREFIX}_qti_2p1.tmpl.php
  48  *     /themes/default/tests/test_questions/{PREFIX}_result.tmpl.php
  49  *     /themes/default/tests/test_questions/{PREFIX}_stats.tmpl.php
  50  *
  51  * 7 - Add the new question type to qti import/export tools,
  52  *     Implement the following methods, which set template variables:
  53  *
  54  *     include/classes/QTI/QTIParser.class.php
  55  *         getQuestionType()
  56  *
  57  * 8 - Done!
  58  **/
  59 class TestQuestions {
  60         // returns array of prefix => name, sorted!
  61         /*static */function getQuestionPrefixNames() {
  62                 $question_prefix_names = array(); // prefix => name
  63                 $questions = TestQuestions::getQuestionClasses();
  64                 foreach ($questions as $type => $question) {
  65                         $o = TestQuestions::getQuestion($type);
  66                         $question_prefix_names[$o->getPrefix()] = $o->getName();
  67                 }
  68                 asort($question_prefix_names);
  69                 return $question_prefix_names;
  70         }
  71
  72         /*static */function getQuestionClasses() {
  73                 /** NOTE: The indices are CONSTANTS. Do NOT change!! **/
  74                 $question_classes = array(); // type ID => class name
  75                 $question_classes[1] = 'MultichoiceQuestion';
  76                 $question_classes[2] = 'TruefalseQuestion';
  77                 $question_classes[3] = 'LongQuestion';
  78                 $question_classes[4] = 'LikertQuestion';
  79                 $question_classes[5] = 'MatchingQuestion';
  80                 $question_classes[6] = 'OrderingQuestion';
  81                 $question_classes[7] = 'MultianswerQuestion';
  82                 $question_classes[8] = 'MatchingddQuestion';
  83
  84                 return $question_classes;
  85         }
  86
  87         /**
  88          * Used to create question objects based on $question_type.
  89          * A singleton that creates one obj per question since
  90          * questions are all stateless.
  91          * Returns a reference to the question object.
  92          */
  93         /*static */function & getQuestion($question_type) {
  94                 static $objs, $question_classes;
  95
  96                 if (isset($objs[$question_type])) {
  97                         return $objs[$question_type];
  98                 }
  99
 100                 $question_classes = TestQuestions::getQuestionClasses();
 101
 102                 if (isset($question_classes[$question_type])) {
 103                         global $savant;
 104                         $objs[$question_type] = new $question_classes[$question_type]($savant);
 105                 } else {
 106                         return FALSE;
 107                 }
 108
 109                 return $objs[$question_type];
 110         }
 111 }
 112
 113 /**
 114  * Export test questions
 115  * @param       array   an array consist of all the ids of the questions in which we desired to export.
 116  */
 117 function test_question_qti_export_v2p1($question_ids) {
 118         global $_course_id;
 119
 120         require_once(TR_INCLUDE_PATH.'classes/DAO/CoursesDAO.class.php');
 121         require_once(TR_INCLUDE_PATH.'classes/DAO/TestsQuestionsDAO.class.php');
 122         require_once(TR_INCLUDE_PATH.'classes/zipfile.class.php'); // for zipfile
 123         require_once(TR_INCLUDE_PATH.'lib/html_resource_parser.inc.php'); // for get_html_resources()
 124         require_once(TR_INCLUDE_PATH.'classes/XML/XML_HTMLSax/XML_HTMLSax.php');        // for XML_HTMLSax
 125
 126         global $savant, $db, $languageManager;
 127
 128         $coursesDAO = new CoursesDAO();
 129         $course_row = $coursesDAO->get($_course_id);
 130         $course_language = $course_row['primary_language'];
 131         $courseLanguage =& $languageManager->getLanguage($course_language);
 132         $course_language_charset = $courseLanguage->getCharacterSet();
 133
 134         $zipfile = new zipfile();
 135         $zipfile->create_dir('resources/'); // for all the dependency files
 136         $resources    = array();
 137         $dependencies = array();
 138
 139         asort($question_ids);
 140
 141         $testsQuestionsDAO = new TestsQuestionsDAO();
 142         $rows = $testsQuestionsDAO->getByQuestionIDs($question_ids);
 143         if (is_array($rows)) {
 144                 foreach ($rows as $row) {
 145                         $obj = TestQuestions::getQuestion($row['type']);
 146                         $xml = $obj->exportQTI($row, $course_language_charset, '2.1');
 147                         $local_dependencies = array();
 148
 149                         $text_blob = implode(' ', $row);
 150                         $local_dependencies = get_html_resources($text_blob);
 151                         $dependencies = array_merge($dependencies, $local_dependencies);
 152
 153                         $resources[] = array('href'         => 'question_'.$row['question_id'].'.xml',
 154                                                                  'dependencies' => array_keys($local_dependencies));
 155
 156                         //TODO
 157                         $savant->assign('xml_content', $xml);
 158                         $savant->assign('title', $row['question']);
 159                         $xml = $savant->fetch('tests/test_questions/wrapper.tmpl.php');
 160
 161                         $zipfile->add_file($xml, 'question_'.$row['question_id'].'.xml');
 162                 }
 163         }
 164
 165         // add any dependency files:
 166         foreach ($dependencies as $resource => $resource_server_path) {
 167                 $zipfile->add_file(@file_get_contents($resource_server_path), 'resources/' . $resource, filemtime($resource_server_path));
 168         }
 169
 170         // construct the manifest xml
 171         $savant->assign('resources', $resources);
 172         $savant->assign('dependencies', array_keys($dependencies));
 173         $savant->assign('encoding', $course_language_charset);
 174         $manifest_xml = $savant->fetch('tests/test_questions/manifest_qti_2p1.tmpl.php');
 175
 176         $zipfile->add_file($manifest_xml, 'imsmanifest.xml');
 177
 178         $zipfile->close();
 179
 180         $filename = str_replace(array(' ', ':'), '_', $course_row['title'].'-'._AT('question_database').'-'.date('Ymd'));
 181         $zipfile->send_file($filename);
 182         exit;
 183 }
 184
 185
 186 /**
 187  * Export test questions
 188  * @param       array   an array consist of all the ids of the questions in which we desired to export.
 189  */
 190 function test_question_qti_export($question_ids) {
 191         global $_course_id;
 192
 193         require_once(TR_INCLUDE_PATH.'classes/DAO/CoursesDAO.class.php');
 194         require_once(TR_INCLUDE_PATH.'classes/DAO/TestsQuestionsDAO.class.php');
 195         require_once(TR_INCLUDE_PATH.'classes/zipfile.class.php'); // for zipfile
 196         require_once(TR_INCLUDE_PATH.'lib/html_resource_parser.inc.php'); // for get_html_resources()
 197         require_once(TR_INCLUDE_PATH.'classes/XML/XML_HTMLSax/XML_HTMLSax.php');        // for XML_HTMLSax
 198
 199         global $savant, $db, $languageManager;
 200
 201         $coursesDAO = new CoursesDAO();
 202         $course_row = $coursesDAO->get($_course_id);
 203         $course_language = $course_row['primary_language'];
 204         $courseLanguage =& $languageManager->getLanguage($course_language);
 205         $course_language_charset = $courseLanguage->getCharacterSet();
 206
 207         $zipfile = new zipfile();
 208         $zipfile->create_dir('resources/'); // for all the dependency files
 209         $resources    = array();
 210         $dependencies = array();
 211
 212         asort($question_ids);
 213
 214         $testsQuestionsDAO = new TestsQuestionsDAO();
 215         $rows = $testsQuestionsDAO->getByQuestionIDs($question_ids);
 216         if (is_array($rows)) {
 217                 foreach ($rows as $row) {
 218                         $obj = TestQuestions::getQuestion($row['type']);
 219                         $local_xml = '';
 220                         $local_xml = $obj->exportQTI($row, $course_language_charset, '1.2.1');
 221                         $local_dependencies = array();
 222
 223                         $text_blob = implode(' ', $row);
 224                         $local_dependencies = get_html_resources($text_blob);
 225                         $dependencies = array_merge($dependencies, $local_dependencies);
 226
 227         //              $resources[] = array('href'         => 'question_'.$row['question_id'].'.xml',
 228         //                                                       'dependencies' => array_keys($local_dependencies));
 229
 230                         $xml = $xml . "\n\n" . $local_xml;
 231                 }
 232         }
 233         $xml = trim($xml);
 234
 235         //TODO
 236         $savant->assign('xml_content', $xml);
 237         $savant->assign('title', $row['question']);
 238         $xml = $savant->fetch('tests/test_questions/wrapper.tmpl.php');
 239
 240         $xml_filename = 'atutor_questions.xml';
 241         $zipfile->add_file($xml, $xml_filename);
 242
 243         // add any dependency files:
 244         foreach ($dependencies as $resource => $resource_server_path) {
 245                 $zipfile->add_file(@file_get_contents($resource_server_path), 'resources/' . $resource, filemtime($resource_server_path));
 246         }
 247
 248         // construct the manifest xml
 249 //      $savant->assign('resources', $resources);
 250         $savant->assign('dependencies', array_keys($dependencies));
 251         $savant->assign('encoding', $course_language_charset);
 252         $savant->assign('xml_filename', $xml_filename);
 253 //      $manifest_xml = $savant->fetch('tests/test_questions/manifest_qti_2p1.tmpl.php');
 254         $manifest_xml = $savant->fetch('tests/test_questions/manifest_qti_1p2.tmpl.php');
 255
 256         $zipfile->add_file($manifest_xml, 'imsmanifest.xml');
 257
 258         $zipfile->close();
 259
 260         $filename = str_replace(array(' ', ':'), '_', $course_row['title'].'-'._AT('question_database').'-'.date('Ymd'));
 261         $zipfile->send_file($filename);
 262         exit;
 263 }
 264
 265
 266 /**
 267  * Export test
 268  * @param       int             test id
 269  * @param       string  the test title
 270  * @param       ref             [OPTIONAL] zip object reference
 271  * @param       array   [OPTIONAL] list of already added files.
 272  */
 273 function test_qti_export($tid, $test_title='', $zipfile = null){
 274         global $_course_id;
 275
 276         require_once(TR_INCLUDE_PATH.'classes/DAO/CoursesDAO.class.php');
 277         require_once(TR_INCLUDE_PATH.'classes/DAO/TestsDAO.class.php');
 278         require_once(TR_INCLUDE_PATH.'classes/DAO/TestsQuestionsAssocDAO.class.php');
 279         require_once(TR_INCLUDE_PATH.'classes/zipfile.class.php'); // for zipfile
 280         require_once(TR_INCLUDE_PATH.'classes/XML/XML_HTMLSax/XML_HTMLSax.php');        // for XML_HTMLSax
 281         require_once(TR_INCLUDE_PATH.'lib/html_resource_parser.inc.php'); // for get_html_resources()
 282         global $savant, $db, $languageManager, $test_zipped_files, $test_files, $use_cc;
 283         global $course_id;
 284
 285         $coursesDAO = new CoursesDAO();
 286         $course_row = $coursesDAO->get($_course_id);
 287         $course_language = $course_row['primary_language'];
 288         $courseLanguage =& $languageManager->getLanguage($course_language);
 289         $course_language_charset = $courseLanguage->getCharacterSet();
 290         $imported_files;
 291         $zipflag = false;
 292
 293         if ($zipfile==null){
 294                 $zipflag = true;
 295         }
 296
 297         if ($test_zipped_files == null){
 298                 $test_zipped_files = array();
 299         }
 300
 301         if ($zipflag){
 302                 $zipfile = new zipfile();
 303                 $zipfile->create_dir('resources/'); // for all the dependency files
 304         }
 305         $resources    = array();
 306         $dependencies = array();
 307
 308 //      don't want to sort it, i want the same order out.
 309 //      asort($question_ids);
 310
 311         //TODO: Merge the following 2 sqls together.
 312         //Randomized or not, export all the questions that are associated with it.
 313 //      $sql    = "SELECT TQ.question_id, TQA.weight FROM ".TABLE_PREFIX."tests_questions TQ INNER JOIN ".TABLE_PREFIX."tests_questions_assoc TQA USING (question_id) WHERE TQ.course_id=$_SESSION[course_id] AND TQA.test_id=$tid ORDER BY TQA.ordering, TQA.question_id";
 314 //      $result = mysql_query($sql, $db);
 315 //      $question_ids = array();
 316 //
 317 //      if (is_array($question_rows)){
 318 //              foreach ($question_rows as $question_row) $question_ids[] = $question_row['question_id'];
 319 //      }
 320 //
 321 //      //No questions in the test
 322 //      if (sizeof($question_ids)==0){
 323 //              return;
 324 //      }
 325 //
 326 //      $question_ids_delim = implode(',',$question_ids);
 327 //
 328 //      //$sql = "SELECT * FROM ".TABLE_PREFIX."tests_questions WHERE course_id=$_SESSION[course_id] AND question_id IN($question_ids_delim)";
 329 //      $sql = "SELECT TQ.*, TQA.weight, TQA.test_id FROM ".TABLE_PREFIX."tests_questions TQ INNER JOIN ".TABLE_PREFIX."tests_questions_assoc TQA USING (question_id) WHERE TQA.test_id=$tid AND TQ.question_id IN($question_ids_delim) ORDER BY TQA.ordering, TQA.question_id";
 330 //
 331 //      $result = mysql_query($sql, $db);
 332 //      while ($row = mysql_fetch_assoc($result)) {
 333         $testsQuestionsAssocDAO = new TestsQuestionsAssocDAO();
 334         $question_rows = $testsQuestionsAssocDAO->getByTestID($tid);
 335
 336         if (!is_array($question_rows)) return false;
 337         else {
 338                 foreach ($question_rows as $row) {
 339                         $obj = TestQuestions::getQuestion($row['type']);
 340                         $local_xml = '';
 341                         $local_xml = $obj->exportQTI($row, $course_language_charset, '1.2.1');
 342                         $local_dependencies = array();
 343
 344                         $text_blob = implode(' ', $row);
 345                         $local_dependencies = get_html_resources($text_blob);
 346                         $dependencies = array_merge($dependencies, $local_dependencies);
 347
 348                         $xml = $xml . "\n\n" . $local_xml;
 349                 }
 350         }
 351
 352         //files that are found inside the test; used by print_organization(), to add all test files into QTI/ folder.
 353         $test_files = $dependencies;
 354
 355         $resources[] = array('href'         => 'tests_'.$tid.'.xml',
 356                                                  'dependencies' => array_keys($dependencies));
 357
 358         $xml = trim($xml);
 359
 360         //get test title
 361 //      $sql = "SELECT title FROM ".TABLE_PREFIX."tests WHERE test_id = $tid";
 362 //      $result = mysql_query($sql, $db);
 363 //      $row = mysql_fetch_array($result);
 364         $testsDAO = new TestsDAO();
 365         $row = $testsDAO->get($tid);
 366
 367         //TODO: wrap around xml now
 368         $savant->assign('xml_content', $xml);
 369         $savant->assign('title', htmlspecialchars($row['title'], ENT_QUOTES, 'UTF-8'));
 370         $xml = $savant->fetch('tests/test_questions/wrapper.tmpl.php');
 371
 372         $xml_filename = 'tests_'.$tid.'.xml';
 373         if (!$use_cc){
 374                 $zipfile->add_file($xml, $xml_filename);
 375         } else {
 376                 $zipfile->add_file($xml, 'QTI/'.$xml_filename);
 377         }
 378
 379         // add any dependency files:
 380         if (!$use_cc){
 381                 foreach ($dependencies as $resource => $resource_server_path) {
 382                         //add this file in if it's not already in the zip package
 383                         if (!in_array($resource_server_path, $test_zipped_files)){
 384                                 $zipfile->add_file(@file_get_contents($resource_server_path), 'resources/'.$resource, filemtime($resource_server_path));
 385                                 $test_zipped_files[] = $resource_server_path;
 386                         }
 387                 }
 388         }
 389
 390         if ($zipflag){
 391                 // construct the manifest xml
 392                 $savant->assign('resources', $resources);
 393                 $savant->assign('dependencies', array_keys($dependencies));
 394                 $savant->assign('encoding', $course_language_charset);
 395                 $savant->assign('title', $test_title);
 396                 $savant->assign('xml_filename', $xml_filename);
 397
 398                 $manifest_xml = $savant->fetch('tests/test_questions/manifest_qti_1p2.tmpl.php');
 399                 $zipfile->add_file($manifest_xml, 'imsmanifest.xml');
 400
 401                 $zipfile->close();
 402
 403                 $filename = str_replace(array(' ', ':'), '_', $course_row['title'].'-'.$test_title.'-'.date('Ymd'));
 404                 $zipfile->send_file($filename);
 405                 exit;
 406         }
 407
 408         $return_array[$xml_filename] = array_keys($dependencies);
 409         return $return_array;
 410         //done
 411 }
 412
 413
 414 /*
 415  * Recursively create folders
 416  * For the purpose of this webapp only.  All the paths are seperated by a /
 417  * And thus this function will loop through each directory and create them on the way
 418  * if it doesn't exist.
 419  * @author harris
 420  */
 421 function recursive_mkdir($path, $mode = 0700) {
 422     $dirs = explode(DIRECTORY_SEPARATOR , $path);
 423     $count = count($dirs);
 424     $path = '';
 425     for ($i = 0; $i < $count; ++$i) {
 426         $path .= $dirs[$i].DIRECTORY_SEPARATOR;
 427                 //If the directory has not been created, create it and return error on failure
 428         if (!is_dir($path) && !mkdir($path, $mode)) {
 429             return false;
 430         }
 431     }
 432     return true;
 433 }
 434
 435
 436 /**
 437 * keeps count of the question number (when displaying the question)
 438 * need this function because PHP 4 doesn't support static members
 439 */
 440 function TestQuestionCounter($increment = FALSE) {
 441         static $count;
 442
 443         if (!isset($count)) {
 444                 $count = 0;
 445         }
 446         if ($increment) {
 447                 $count++;
 448         }
 449
 450         return $count;
 451 }
 452
 453
 454 /**
 455  * testQuestion
 456  *
 457  * Note that all PHP 5 OO declarations and signatures are commented out to be
 458  * backwards compatible with PHP 4.
 459  *
 460  */
 461 /*abstract */ class AbstractTestQuestion  {
 462         /**
 463         * Savant2 $savant - refrence to the savant obj
 464         */
 465         /*protected */ var $savant;
 466
 467         /**
 468         * Constructor method.  Initialises variables.
 469         */
 470         function AbstractTestQuestion(&$savant) { $this->savant =& $savant; }
 471
 472         /**
 473         * Public
 474         */
 475         /*final public */function seed($salt) {
 476                 /**
 477                 * by controlling the seed before calling array_rand() we insure that
 478                 * we can un-randomize the order for marking.
 479                 * used with ordering type questions only.
 480                 */
 481                 srand($salt + $_SESSION['user_id']);
 482         }
 483
 484         /**
 485         * Public
 486         */
 487         /*final public */function unseed() {
 488                 // To fix http://www.atutor.ca/atutor/mantis/view.php?id=3167
 489                 // Disturb the seed for ordering questions after mark to avoid the deterioration
 490                 // of the random distribution due to a repeated initialization of the same random seed
 491                 list($usec, $sec) = explode(" ", microtime());
 492                 srand((int)($usec*10));
 493         }
 494
 495         /**
 496         * Public
 497         * Prints the name of this question
 498         */
 499         /*final public */function printName() { echo $this->getName(); }
 500
 501         /**
 502         * Public
 503         * Prints the name of this question
 504         */
 505         /*final public */function getName() { return _AT($this->sNameVar); }
 506
 507         /**
 508         * Public
 509         * Returns the prefix string (used for file names)
 510         */
 511         /*final public */function getPrefix() { return $this->sPrefix; }
 512
 513         /**
 514         * Display the current question (for taking or previewing a test/question)
 515         */
 516         /*final public */function display($row, $response = '') {
 517                 // print the generic question header
 518                 require_once(TR_INCLUDE_PATH.'../home/classes/ContentUtility.class.php');
 519                 $this->displayHeader($row['weight']);
 520
 521                 // print the question specific template
 522                 $row['question'] = ContentUtility::formatContent($row['question'], 1);
 523                 $this->assignDisplayVariables($row, $response);
 524                 $this->savant->display('tests/test_questions/' . $this->sPrefix . '.tmpl.php');
 525
 526                 // print the generic question footer
 527                 $this->displayFooter();
 528         }
 529
 530         /**
 531         * Display the result for the current question
 532         */
 533         /*final public */function displayResult($row, $answer_row, $editable = FALSE) {
 534                 // print the generic question header
 535                 $this->displayHeader($row['weight'], $answer_row['score'], $editable ? $row['question_id'] : FALSE);
 536
 537                 // print the question specific template
 538                 $this->assignDisplayResultVariables($row, $answer_row);
 539                 $this->savant->display('tests/test_questions/' . $this->sPrefix . '_result.tmpl.php');
 540
 541                 // print the generic question footer
 542                 $this->displayFooter();
 543         }
 544
 545
 546         /**
 547         * print the question template header
 548         */
 549         /*final public */function displayResultStatistics($row, $answers) {
 550                 TestQuestionCounter(TRUE);
 551                 $this->assignDisplayStatisticsVariables($row, $answers);
 552                 $this->savant->display('tests/test_questions/' . $this->sPrefix . '_stats.tmpl.php');
 553         }
 554
 555         /*final public */function exportQTI($row, $encoding, $version) {
 556                 $this->savant->assign('encoding', $encoding);
 557                 //Convert all row values to html entities
 558                 foreach ($row as $k=>$v){
 559                         $row[$k] = htmlspecialchars($v, ENT_QUOTES, 'UTF-8');   //not using htmlentities cause it changes some languages falsely.
 560                 }
 561                 $this->assignQTIVariables($row);
 562                 if ($version=='2.1') {
 563                         $xml = $this->savant->fetch('tests/test_questions/'. $this->sPrefix . '_qti_2p1.tmpl.php');
 564                 } else {
 565                         $xml = $this->savant->fetch('tests/test_questions/'. $this->sPrefix . '_qti_1p2.tmpl.php');
 566                 }
 567                 return $xml;
 568         }
 569
 570         /**
 571         * print the question template header
 572         */
 573         /*final private */function displayHeader($weight, $score = FALSE, $question_id = FALSE) {
 574                 TestQuestionCounter(TRUE);
 575
 576                 if ($score) $score = intval($score);
 577                 $this->savant->assign('question_id', $question_id);
 578                 $this->savant->assign('score', $score);
 579                 $this->savant->assign('weight', $weight);
 580                 $this->savant->assign('type',   _AT($this->sNameVar));
 581                 $this->savant->assign('number', TestQuestionCounter());
 582                 $this->savant->display('tests/test_questions/header.tmpl.php');
 583         }
 584
 585         /**
 586         * print the question template footer
 587         */
 588         /*final private */function displayFooter() {
 589                 $this->savant->display('tests/test_questions/footer.tmpl.php');
 590         }
 591
 592         /**
 593         * return only the non-empty choices from $row.
 594         * assumes choices are sequential.
 595         */
 596         /*protected */function getChoices($row) {
 597                 $choices = array();
 598                 for ($i=0; $i < 10; $i++) {
 599                         if ($row['choice_'.$i] != '') {
 600                                 $num_choices++;
 601                                 $choices[] = $row['choice_'.$i];
 602                         } else {
 603                                 break;
 604                         }
 605                 }
 606                 return $choices;
 607         }
 608 }
 609
 610 /**
 611 * orderingQuestion
 612 *
 613 */
 614 class OrderingQuestion extends AbstractTestQuestion {
 615         /*protected */ var $sNameVar = 'test_ordering';
 616         /*protected */ var $sPrefix = 'ordering';
 617
 618         /*protected */function assignDisplayResultVariables($row, $answer_row) {
 619                 $answers = explode('|', $answer_row['answer']);
 620
 621                 $num_choices = count($this->getChoices($row));
 622
 623                 $this->savant->assign('base_href', TR_BASE_HREF);
 624                 $this->savant->assign('num_choices', $num_choices);
 625                 $this->savant->assign('answers', $answers);
 626                 $this->savant->assign('row', $row);
 627         }
 628
 629         /*protected */function assignQTIVariables($row) {
 630                 $choices = $this->getChoices($row);
 631                 $num_choices = count($choices);
 632
 633                 $this->savant->assign('num_choices', $num_choices);
 634                 $this->savant->assign('row', $row);
 635         }
 636
 637         /*protected */function assignDisplayVariables($row, $response) {
 638                 // determine the number of choices this question has
 639                 // and save those choices to be re-assigned back to $row
 640                 // in the randomized order.
 641                 $choices = $this->getChoices($row);
 642                 $num_choices = count($choices);
 643
 644                 // response from the test_answers table is in the correct order
 645                 // so, they have to be re-randomized in the same order as the
 646                 // choices are. this is only possible because of the seed() method.
 647                 $response = explode('|', $response);
 648                 $new_response = array();
 649
 650                 // randomize the order of choices and re-assign to $row
 651                 $this->seed($row['question_id']);
 652                 $rand = array_rand($choices, $num_choices);
 653                 for ($i=0; $i < 10; $i++) {
 654                         $row['choice_'.$i] = $choices[$rand[$i]];
 655                         $new_response[$i]  = $response[$rand[$i]];
 656                 }
 657
 658                 $this->savant->assign('num_choices', $num_choices);
 659                 $this->savant->assign('row', $row);
 660
 661                 $this->savant->assign('response', $new_response);
 662         }
 663
 664         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
 665                 $num_results = 0;
 666                 foreach ($answers as $answer) {
 667                         $num_results += $answer['count'];
 668                 }
 669
 670                 $choices = $this->getChoices($row);
 671                 $num_choices = count($choices);
 672
 673                 $final_answers = array(); // assoc array of # of times that key was used correctly 0, 1, ...  $num -1
 674                 foreach ($answers as $key => $value) {
 675                         $values = explode('|', $key);
 676                         // we assume $values is never empty and contains $num number of answers
 677                         for ($i=0; $i<=$num_choices; $i++) {
 678                                 if ($values[$i] == $i) {
 679                                         $final_answers[$i] += $answers[$key]['count'];
 680                                 }
 681                         }
 682                 }
 683
 684                 $this->savant->assign('num_results', $num_results);
 685                 $this->savant->assign('num_choices', $num_choices);
 686                 $this->savant->assign('answers', $final_answers);
 687                 $this->savant->assign('row', $row);
 688         }
 689
 690         /*public */function mark($row) {
 691                 $this->seed($row['question_id']);
 692                 $num_choices = count($_POST['answers'][$row['question_id']]);
 693                 $answers = range(0, $num_choices-1);
 694                 $answers = array_rand($answers, $num_choices);
 695
 696                 // Disturb the seed for ordering questions after mark to avoid the deterioration
 697                 // of the random distribution due to a repeated initialization of the same random seed
 698                 $this->unseed();
 699
 700                 $num_answer_correct = 0;
 701
 702                 $ordered_answers = array();
 703
 704                 for ($i = 0; $i < $num_choices ; $i++) {
 705                         $_POST['answers'][$row['question_id']][$i] = intval($_POST['answers'][$row['question_id']][$i]);
 706
 707                         if ($_POST['answers'][$row['question_id']][$i] == -1) {
 708                                 // nothing to do. it was left blank
 709                         } else if ($_POST['answers'][$row['question_id']][$i] == $answers[$i]) {
 710                                 $num_answer_correct++;
 711                         }
 712                         $ordered_answers[$answers[$i]] = $_POST['answers'][$row['question_id']][$i];
 713                 }
 714                 ksort($ordered_answers);
 715
 716                 $score = 0;
 717
 718                 // to avoid roundoff errors:
 719                 if ($num_answer_correct == $num_choices) {
 720                         $score = $row['weight'];
 721                 } else if ($num_answer_correct > 0) {
 722                         $score = number_format($row['weight'] / $num_choices * $num_answer_correct, 2);
 723                         if ( (float) (int) $score == $score) {
 724                                 $score = (int) $score; // a whole number with decimals, eg. "2.00"
 725                         } else {
 726                                 $score = trim($score, '0'); // remove trailing zeros, if any, eg. "2.50"
 727                         }
 728                 }
 729
 730                 $_POST['answers'][$row['question_id']] = implode('|', $ordered_answers);
 731
 732                 return $score;
 733         }
 734
 735         //QTI Import Ordering Question
 736         function importQTI($_POST){
 737                 global $_course_id;
 738
 739                 require_once(TR_INCLUDE_PATH.'classes/DAO/DAO.class.php');
 740                 require_once(TR_INCLUDE_PATH.'classes/Utility.class.php');
 741                 global $msg, $db;
 742
 743                 if ($_POST['question'] == ''){
 744                         $missing_fields[] = _AT('question');
 745                 }
 746
 747                 if (trim($_POST['choice'][0]) == '') {
 748                         $missing_fields[] = _AT('item').' 1';
 749                 }
 750                 if (trim($_POST['choice'][1]) == '') {
 751                         $missing_fields[] = _AT('item').' 2';
 752                 }
 753
 754                 if ($missing_fields) {
 755                         $missing_fields = implode(', ', $missing_fields);
 756                         $msg->addError(array('EMPTY_FIELDS', $missing_fields));
 757                 }
 758
 759                 if (!$msg->containsErrors()) {
 760                         $choice_new = array(); // stores the non-blank choices
 761                         $answer_new = array(); // stores the non-blank answers
 762                         $order = 0; // order count
 763                         for ($i=0; $i<10; $i++) {
 764                                 /**
 765                                  * Db defined it to be 255 length, chop strings off it it's less than that
 766                                  * @harris
 767                                  */
 768                                 $_POST['choice'][$i] = Utility::validateLength($_POST['choice'][$i], 255);
 769                                 $_POST['choice'][$i] = trim($_POST['choice'][$i]);
 770
 771                                 if ($_POST['choice'][$i] != '') {
 772                                         /* filter out empty choices/ remove gaps */
 773                                         $choice_new[] = $_POST['choice'][$i];
 774                                         $answer_new[] = $order++;
 775                                 }
 776                         }
 777
 778                         $_POST['choice']   = array_pad($choice_new, 10, '');
 779                         $answer_new        = array_pad($answer_new, 10, 0);
 780 //                      $_POST['feedback'] = $addslashes($_POST['feedback']);
 781 //                      $_POST['question'] = $addslashes($_POST['question']);
 782
 783                         $sql_params = array(    $_POST['category_id'],
 784                                                                         $_course_id,
 785                                                                         $_POST['feedback'],
 786                                                                         $_POST['question'],
 787                                                                         $_POST['choice'][0],
 788                                                                         $_POST['choice'][1],
 789                                                                         $_POST['choice'][2],
 790                                                                         $_POST['choice'][3],
 791                                                                         $_POST['choice'][4],
 792                                                                         $_POST['choice'][5],
 793                                                                         $_POST['choice'][6],
 794                                                                         $_POST['choice'][7],
 795                                                                         $_POST['choice'][8],
 796                                                                         $_POST['choice'][9],
 797                                                                         $answer_new[0],
 798                                                                         $answer_new[1],
 799                                                                         $answer_new[2],
 800                                                                         $answer_new[3],
 801                                                                         $answer_new[4],
 802                                                                         $answer_new[5],
 803                                                                         $answer_new[6],
 804                                                                         $answer_new[7],
 805                                                                         $answer_new[8],
 806                                                                         $answer_new[9]);
 807
 808                         $sql = vsprintf(TR_SQL_QUESTION_ORDERING, $sql_params);
 809
 810 //                      $result = mysql_query($sql, $db);
 811 //                      if ($result==true){
 812                         $dao = new DAO();
 813                         if ($dao->execute($sql)) {
 814                                 return mysql_insert_id();
 815                         }
 816                 }
 817         }
 818 }
 819
 820 /**
 821 * truefalseQuestion
 822 *
 823 */
 824 class TruefalseQuestion extends AbstracttestQuestion {
 825         /*protected */ var $sPrefix = 'truefalse';
 826         /*protected */ var $sNameVar   = 'test_tf';
 827
 828         /*protected */function assignQTIVariables($row) {
 829                 $this->savant->assign('row', $row);
 830         }
 831
 832         /*protected */function assignDisplayResultVariables($row, $answer_row) {
 833
 834                 $this->savant->assign('base_href', TR_BASE_HREF);
 835                 $this->savant->assign('answers', $answer_row['answer']);
 836                 $this->savant->assign('row', $row);
 837         }
 838
 839         /*protected */function assignDisplayVariables($row, $response) {
 840                 $this->savant->assign('row', $row);
 841                 $this->savant->assign('response', $response);
 842         }
 843
 844         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
 845                 $num_results = 0;
 846                 foreach ($answers as $answer) {
 847                         $num_results += $answer['count'];
 848                 }
 849
 850                 $this->savant->assign('num_results', $num_results);
 851                 $this->savant->assign('num_blanks', (int) $answers['-1']['count']);
 852                 $this->savant->assign('num_true', (int) $answers['1']['count']);
 853                 $this->savant->assign('num_false', (int) $answers['2']['count']);
 854                 $this->savant->assign('row', $row);
 855         }
 856
 857         /*public */function mark($row) {
 858                 $_POST['answers'][$row['question_id']] = intval($_POST['answers'][$row['question_id']]);
 859
 860                 if ($row['answer_0'] == $_POST['answers'][$row['question_id']]) {
 861                         return (int) $row['weight'];
 862                 } // else:
 863                 return 0;
 864         }
 865
 866         //QTI Import True/False Question
 867         function importQTI($_POST){
 868                 require_once(TR_INCLUDE_PATH.'classes/DAO/DAO.class.php');
 869                 global $msg, $db, $_course_id;
 870
 871                 if ($_POST['question'] == ''){
 872                         $msg->addError(array('EMPTY_FIELDS', _AT('statement')));
 873                 }
 874
 875                 //assign true answer to 1, false answer to 2, idk to 3, for ATutor
 876                 if  ($_POST['answer'] == 'ChoiceT'){
 877                         $_POST['answer'] = 1;
 878                 } else {
 879                         $_POST['answer'] = 2;
 880                 }
 881
 882                 if (!$msg->containsErrors()) {
 883 //                      $_POST['feedback'] = $addslashes($_POST['feedback']);
 884 //                      $_POST['question'] = $addslashes($_POST['question']);
 885
 886
 887                         $sql_params = array(    $_POST['category_id'],
 888                                                                         $_course_id,
 889                                                                         $_POST['feedback'],
 890                                                                         $_POST['question'],
 891                                                                         $_POST['answer']);
 892
 893                         $sql = vsprintf(TR_SQL_QUESTION_TRUEFALSE, $sql_params);
 894 //                      $result = mysql_query($sql, $db);
 895 //                      if ($result==true){
 896                         $dao = new DAO();
 897                         if ($dao->execute($sql)) {
 898                                 return mysql_insert_id();
 899                         }
 900                 }
 901         }
 902 }
 903
 904 /**
 905 * likertQuestion
 906 *
 907 */
 908 class LikertQuestion extends AbstracttestQuestion {
 909         /*protected */ var $sPrefix = 'likert';
 910         /*protected */ var $sNameVar   = 'test_lk';
 911
 912         /*protected */function assignQTIVariables($row) {
 913                 $choices = $this->getChoices($row);
 914                 $num_choices = count($choices);
 915
 916                 $this->savant->assign('num_choices', $num_choices);
 917                 $this->savant->assign('row', $row);
 918         }
 919
 920         /*protected */function assignDisplayResultVariables($row, $answer_row) {
 921                 $this->savant->assign('answer', $answer_row['answer']);
 922                 $this->savant->assign('row', $row);
 923         }
 924
 925         /*protected */function assignDisplayVariables($row, $response) {
 926                 $choices = $this->getChoices($row);
 927                 $num_choices = count($choices);
 928
 929                 $this->savant->assign('num_choices', $num_choices);
 930                 $this->savant->assign('row', $row);
 931
 932                 if (empty($response)) {
 933                         $response = -1;
 934                 }
 935                 $this->savant->assign('response', $response);
 936         }
 937
 938         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
 939                 $num_results = 0;
 940                 foreach ($answers as $answer) {
 941                         $num_results += $answer['count'];
 942                 }
 943
 944                 $choices = $this->getChoices($row);
 945                 $num_choices = count($choices);
 946
 947                 $sum = 0;
 948                 for ($i=0; $i<$num_choices; $i++) {
 949                         $sum += ($i+1) * $answers[$i]['count'];
 950                 }
 951                 $average = round($sum/$num_results, 1);
 952
 953                 $this->savant->assign('num_results', $num_results);
 954                 $this->savant->assign('average', $average);
 955                 $this->savant->assign('num_choices', $num_choices);
 956                 $this->savant->assign('num_blanks', (int) $answers['-1']['count']);
 957                 $this->savant->assign('answers', $answers);
 958                 $this->savant->assign('row', $row);
 959         }
 960
 961         /*public */function mark($row) {
 962                 $_POST['answers'][$row['question_id']] = intval($_POST['answers'][$row['question_id']]);
 963                 return 0;
 964         }
 965
 966         //QTI Import Likert Question
 967         function importQTI($_POST){
 968                 require_once(TR_INCLUDE_PATH.'classes/DAO/DAO.class.php');
 969                 global $msg, $db, $_course_id;
 970 //              $_POST = $this->_POST;
 971
 972                 $empty_fields = array();
 973                 if ($_POST['question'] == ''){
 974                         $empty_fields[] = _AT('question');
 975                 }
 976                 if ($_POST['choice'][0] == '') {
 977                         $empty_fields[] = _AT('choice').' 1';
 978                 }
 979
 980                 if ($_POST['choice'][1] == '') {
 981                         $empty_fields[] = _AT('choice').' 2';
 982                 }
 983
 984                 if (!empty($empty_fields)) {
 985 //                      $msg->addError(array('EMPTY_FIELDS', implode(', ', $empty_fields)));
 986                 }
 987
 988                 if (!$msg->containsErrors()) {
 989                         $_POST['feedback']   = '';
 990 //                      $_POST['question']   = $addslashes($_POST['question']);
 991
 992                         for ($i=0; $i<10; $i++) {
 993                                 $_POST['choice'][$i] = trim($_POST['choice'][$i]);
 994                                 $_POST['answer'][$i] = intval($_POST['answer'][$i]);
 995
 996                                 if ($_POST['choice'][$i] == '') {
 997                                         /* an empty option can't be correct */
 998                                         $_POST['answer'][$i] = 0;
 999                                 }
1000                         }
1001
1002                         $sql_params = array(    $_POST['category_id'],
1003                                                                         $_course_id,
1004                                                                         $_POST['feedback'],
1005                                                                         $_POST['question'],
1006                                                                         $_POST['choice'][0],
1007                                                                         $_POST['choice'][1],
1008                                                                         $_POST['choice'][2],
1009                                                                         $_POST['choice'][3],
1010                                                                         $_POST['choice'][4],
1011                                                                         $_POST['choice'][5],
1012                                                                         $_POST['choice'][6],
1013                                                                         $_POST['choice'][7],
1014                                                                         $_POST['choice'][8],
1015                                                                         $_POST['choice'][9],
1016                                                                         $_POST['answer'][0],
1017                                                                         $_POST['answer'][1],
1018                                                                         $_POST['answer'][2],
1019                                                                         $_POST['answer'][3],
1020                                                                         $_POST['answer'][4],
1021                                                                         $_POST['answer'][5],
1022                                                                         $_POST['answer'][6],
1023                                                                         $_POST['answer'][7],
1024                                                                         $_POST['answer'][8],
1025                                                                         $_POST['answer'][9]);
1026
1027                         $sql = vsprintf(TR_SQL_QUESTION_LIKERT, $sql_params);
1028 //                      $result = mysql_query($sql, $db);
1029 //                      if ($result==true){
1030                         $dao = new DAO();
1031                         if ($dao->execute($sql)) {
1032                                 return mysql_insert_id();
1033                         }
1034                 }
1035         }
1036 }
1037
1038 /**
1039 * longQuestion
1040 *
1041 */
1042 class LongQuestion extends AbstracttestQuestion {
1043         /*protected */ var $sPrefix = 'long';
1044         /*protected */ var $sNameVar = 'test_open';
1045
1046         /*protected */function assignQTIVariables($row) {
1047                 $this->savant->assign('row', $row);
1048         }
1049
1050         /*protected */function assignDisplayResultVariables($row, $answer_row) {
1051                 $this->savant->assign('answer', $answer_row['answer']);
1052                 $this->savant->assign('row', $row);
1053         }
1054
1055         /*protected */function assignDisplayVariables($row, $response) {
1056                 $this->savant->assign('row', $row);
1057                 $this->savant->assign('response', $response);
1058         }
1059
1060         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
1061                 $num_results = 0;
1062                 foreach ($answers as $answer) {
1063                         $num_results += $answer['count'];
1064                 }
1065
1066                 $this->savant->assign('num_results', $num_results);
1067                 $this->savant->assign('num_blanks', (int) $answers['']['count']);
1068                 $this->savant->assign('answers', $answers);
1069                 $this->savant->assign('row', $row);
1070         }
1071
1072         /*public */function mark($row) {
1073                 global $addslashes;
1074                 $_POST['answers'][$row['question_id']] = $addslashes($_POST['answers'][$row['question_id']]);
1075                 return NULL;
1076         }
1077
1078         //QTI Import Open end/long Question
1079         function importQTI($_POST){
1080                 require_once(TR_INCLUDE_PATH.'classes/DAO/DAO.class.php');
1081                 global $msg, $db, $_course_id;
1082 //              $_POST = $this->_POST;
1083
1084                 if ($_POST['question'] == ''){
1085 //                      $msg->addError(array('EMPTY_FIELDS', _AT('question')));
1086                 }
1087
1088                 if (!$msg->containsErrors()) {
1089 //                      $_POST['feedback'] = $addslashes($_POST['feedback']);
1090 //                      $_POST['question'] = $addslashes($_POST['question']);
1091
1092                         if ($_POST['property']==''){
1093                                 $_POST['property'] = 4; //essay
1094                         }
1095
1096                         $sql_params = array(    $_POST['category_id'],
1097                                                                         $_course_id,
1098                                                                         $_POST['feedback'],
1099                                                                         $_POST['question'],
1100                                                                         $_POST['property']);
1101
1102                         $sql = vsprintf(TR_SQL_QUESTION_LONG, $sql_params);
1103
1104 //                      $result = mysql_query($sql, $db);
1105 //                      if ($result==true){
1106                         $dao = new DAO();
1107                         if ($dao->execute($sql)) {
1108                                 return mysql_insert_id();
1109                         }
1110                 }
1111         }
1112 }
1113
1114 /**
1115 * matchingQuestion
1116 *
1117 */
1118 class MatchingQuestion extends AbstracttestQuestion {
1119         /*protected */ var $sPrefix = 'matching';
1120         /*protected */ var $sNameVar   = 'test_matching';
1121
1122         /*protected */function assignQTIVariables($row) {
1123                 $choices = $this->getChoices($row);
1124                 $num_choices = count($choices);
1125
1126                 $num_options = 0;
1127                 for ($i=0; $i < 10; $i++) {
1128                         if ($row['option_'. $i] != '') {
1129                                 $num_options++;
1130                         }
1131                 }
1132
1133                 $this->savant->assign('num_choices', $num_choices);
1134                 $this->savant->assign('num_options', $num_options);
1135                 $this->savant->assign('row', $row);
1136         }
1137
1138         /*protected */function assignDisplayResultVariables($row, $answer_row) {
1139                 $num_options = 0;
1140                 for ($i=0; $i < 10; $i++) {
1141                         if ($row['option_'. $i] != '') {
1142                                 $num_options++;
1143                         }
1144                 }
1145
1146                 $answer_row['answer'] = explode('|', $answer_row['answer']);
1147
1148                 global $_letters;
1149
1150                 $this->savant->assign('base_href', TR_BASE_HREF);
1151                 $this->savant->assign('answers', $answer_row['answer']);
1152                 $this->savant->assign('letters', $_letters);
1153                 $this->savant->assign('num_options', $num_options);
1154                 $this->savant->assign('row', $row);
1155         }
1156
1157         /*protected */function assignDisplayVariables($row, $response) {
1158                 $choices = $this->getChoices($row);
1159                 $num_choices = count($choices);
1160
1161                 if (empty($response)) {
1162                         $response = array_fill(0, $num_choices, -1);
1163                 } else {
1164                         $response = explode('|', $response);
1165                 }
1166
1167                 $num_options = 0;
1168                 for ($i=0; $i < 10; $i++) {
1169                         if ($row['option_'. $i] != '') {
1170                                 $num_options++;
1171                         }
1172                 }
1173
1174                 global $_letters;
1175
1176                 $this->savant->assign('num_choices', $num_choices);
1177                 $this->savant->assign('base_href', TR_BASE_HREF);
1178                 $this->savant->assign('letters', $_letters);
1179                 $this->savant->assign('num_options', $num_options);
1180                 $this->savant->assign('row', $row);
1181
1182                 $this->savant->assign('response', $response);
1183         }
1184
1185         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
1186                 $choices = $this->getChoices($row);
1187                 $num_choices = count($choices);
1188
1189                 $num_results = 0;
1190                 foreach ($answers as $answer) {
1191                         $num_results += $answer['count'];
1192                 }
1193
1194                 foreach ($answers as $key => $value) {
1195                         $values = explode('|', $key);
1196                         if (count($values) > 1) {
1197                                 for ($i=0; $i<count($values); $i++) {
1198                                         $answers[$values[$i]]['count']++;
1199                                 }
1200                         }
1201                 }
1202
1203                 $this->savant->assign('num_choices', $num_choices);
1204                 $this->savant->assign('num_results', $num_results);
1205                 $this->savant->assign('answers', $answers);
1206                 $this->savant->assign('row', $row);
1207         }
1208
1209         /*public */function mark($row) {
1210                 $num_choices = count($_POST['answers'][$row['question_id']]);
1211                 $num_answer_correct = 0;
1212                 foreach ($_POST['answers'][$row['question_id']] as $item_id => $response) {
1213                         if ($row['answer_' . $item_id] == $response) {
1214                                 $num_answer_correct++;
1215                         }
1216                         $_POST['answers'][$row['question_id']][$item_id] = intval($_POST['answers'][$row['question_id']][$item_id]);
1217                 }
1218
1219                 $score = 0;
1220                 // to avoid roundoff errors:
1221                 if ($num_answer_correct == $num_choices) {
1222                         $score = $row['weight'];
1223                 } else if ($num_answer_correct > 0) {
1224                         $score = number_format($row['weight'] / $num_choices * $num_answer_correct, 2);
1225                         if ( (float) (int) $score == $score) {
1226                                 $score = (int) $score; // a whole number with decimals, eg. "2.00"
1227                         } else {
1228                                 $score = trim($score, '0'); // remove trailing zeros, if any
1229                         }
1230                 }
1231
1232                 $_POST['answers'][$row['question_id']] = implode('|', $_POST['answers'][$row['question_id']]);
1233
1234                 return $score;
1235         }
1236
1237         //QTI Import Matching Question
1238         function importQTI($_POST){
1239                 require_once(TR_INCLUDE_PATH.'classes/DAO/DAO.class.php');
1240                 global $msg, $db, $_course_id;
1241 //              $_POST = $this->_POST;
1242
1243                 if (!is_array($_POST['answer'])){
1244                         $temp = $_POST['answer'];
1245                         $_POST['answer'] = array();
1246                         $_POST['answer'][0] = $temp;
1247                 }
1248                 ksort($_POST['answer']);        //array_pad returns an array disregard of the array keys
1249                 //default for matching is '-'
1250                 $_POST['answer']= array_pad($_POST['answer'], 10, -1);
1251
1252                 for ($i = 0 ; $i < 10; $i++) {
1253                         $_POST['groups'][$i]        = trim($_POST['groups'][$i]);
1254                         $_POST['answer'][$i] = (int) $_POST['answer'][$i];
1255                         $_POST['choice'][$i]          = trim($_POST['choice'][$i]);
1256                 }
1257
1258                 if (!$_POST['groups'][0]
1259                         || !$_POST['groups'][1]
1260                         || !$_POST['choice'][0]
1261                         || !$_POST['choice'][1]) {
1262 //                      $msg->addError('QUESTION_EMPTY');
1263                 }
1264
1265                 if (!$msg->containsErrors()) {
1266 //                      $_POST['feedback']     = $addslashes($_POST['feedback']);
1267 //                      $_POST['instructions'] = $addslashes($_POST['instructions']);
1268
1269                         $sql_params = array(    $_POST['category_id'],
1270                                                                         $_course_id,
1271                                                                         $_POST['feedback'],
1272                                                                         $_POST['question'],
1273                                                                         $_POST['groups'][0],
1274                                                                         $_POST['groups'][1],
1275                                                                         $_POST['groups'][2],
1276                                                                         $_POST['groups'][3],
1277                                                                         $_POST['groups'][4],
1278                                                                         $_POST['groups'][5],
1279                                                                         $_POST['groups'][6],
1280                                                                         $_POST['groups'][7],
1281                                                                         $_POST['groups'][8],
1282                                                                         $_POST['groups'][9],
1283                                                                         $_POST['answer'][0],
1284                                                                         $_POST['answer'][1],
1285                                                                         $_POST['answer'][2],
1286                                                                         $_POST['answer'][3],
1287                                                                         $_POST['answer'][4],
1288                                                                         $_POST['answer'][5],
1289                                                                         $_POST['answer'][6],
1290                                                                         $_POST['answer'][7],
1291                                                                         $_POST['answer'][8],
1292                                                                         $_POST['answer'][9],
1293                                                                         $_POST['choice'][0],
1294                                                                         $_POST['choice'][1],
1295                                                                         $_POST['choice'][2],
1296                                                                         $_POST['choice'][3],
1297                                                                         $_POST['choice'][4],
1298                                                                         $_POST['choice'][5],
1299                                                                         $_POST['choice'][6],
1300                                                                         $_POST['choice'][7],
1301                                                                         $_POST['choice'][8],
1302                                                                         $_POST['choice'][9]);
1303
1304                         $sql = vsprintf(TR_SQL_QUESTION_MATCHINGDD, $sql_params);
1305
1306                         $dao = new DAO();
1307                         if ($dao->execute($sql)) {
1308                                 return mysql_insert_id();
1309                         }
1310                 }
1311         }
1312 }
1313
1314 /**
1315 * matchingddQuestion
1316 *
1317 */
1318 class MatchingddQuestion extends MatchingQuestion {
1319         /*protected */ var $sPrefix = 'matchingdd';
1320         /*protected */ var $sNameVar   = 'test_matchingdd';
1321 }
1322
1323 /**
1324 * multichoiceQuestion
1325 *
1326 */
1327 class MultichoiceQuestion extends AbstracttestQuestion {
1328         /*protected */ var $sPrefix = 'multichoice';
1329         /*protected */var $sNameVar = 'test_mc';
1330
1331         /*protected */function assignQTIVariables($row) {
1332                 $choices = $this->getChoices($row);
1333                 $num_choices = count($choices);
1334
1335                 $this->savant->assign('num_choices', $num_choices);
1336                 $this->savant->assign('row', $row);
1337         }
1338
1339         /*protected */function assignDisplayResultVariables($row, $answer_row) {
1340                 if (strpos($answer_row['answer'], '|') !== false) {
1341                         $answer_row['answer'] = explode('|', $answer_row['answer']);
1342                 } else {
1343                         $answer_row['answer'] = array($answer_row['answer']);
1344                 }
1345
1346                 $this->savant->assign('base_href', TR_BASE_HREF);
1347                 $this->savant->assign('answers', $answer_row['answer']);
1348                 $this->savant->assign('row', $row);
1349         }
1350
1351         /*protected */function assignDisplayVariables($row, $response) {
1352                 $choices = $this->getChoices($row);
1353                 $num_choices = count($choices);
1354
1355                 if ($response == '') {
1356                         $response = -1;
1357                 }
1358                 $response = explode('|', $response);
1359                 $this->savant->assign('response', $response);
1360
1361                 $this->savant->assign('num_choices', $num_choices);
1362                 $this->savant->assign('row', $row);
1363         }
1364
1365         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
1366                 $choices = $this->getChoices($row);
1367                 $num_choices = count($choices);
1368
1369                 $num_results = 0;
1370                 foreach ($answers as $answer) {
1371                         $num_results += $answer['count'];
1372                 }
1373
1374                 foreach ($answers as $key => $value) {
1375                         $values = explode('|', $key);
1376                         if (count($values) > 1) {
1377                                 for ($i=0; $i<count($values); $i++) {
1378                                         $answers[$values[$i]]['count']++;
1379                                 }
1380                         }
1381                 }
1382
1383                 $this->savant->assign('num_choices', $num_choices);
1384                 $this->savant->assign('num_results', $num_results);
1385                 $this->savant->assign('num_blanks', (int) $answers['-1']['count']);
1386                 $this->savant->assign('answers', $answers);
1387                 $this->savant->assign('row', $row);
1388         }
1389
1390         /*public */function mark($row) {
1391                 $score = 0;
1392                 $_POST['answers'][$row['question_id']] = intval($_POST['answers'][$row['question_id']]);
1393                 if ($row['answer_' . $_POST['answers'][$row['question_id']]]) {
1394                         $score = $row['weight'];
1395                 } else if ($_POST['answers'][$row['question_id']] == -1) {
1396                         $has_answer = 0;
1397                         for($i=0; $i<10; $i++) {
1398                                 $has_answer += $row['answer_'.$i];
1399                         }
1400                         if (!$has_answer && $row['weight']) {
1401                                 // If MC has no answer and user answered "leave blank"
1402                                 $score = $row['weight'];
1403                         }
1404                 }
1405                 return $score;
1406         }
1407
1408         //QTI Import Multiple Choice Question
1409         function importQTI($_POST){
1410                 require_once(TR_INCLUDE_PATH.'classes/DAO/DAO.class.php');
1411                 global $msg, $db, $_course_id;
1412 //              $_POST = $this->_POST;
1413                 if ($_POST['question'] == ''){
1414                         $msg->addError(array('EMPTY_FIELDS', _AT('question')));
1415                 }
1416
1417                 if (!$msg->containsErrors()) {
1418 //                      $_POST['question']   = $addslashes($_POST['question']);
1419
1420                         for ($i=0; $i<10; $i++) {
1421                                 $_POST['choice'][$i] = trim($_POST['choice'][$i]);
1422                         }
1423
1424                         $answers = array_fill(0, 10, 0);
1425                         if (is_array($_POST['answer'])){
1426                                 $answers[0] = 1;        //default the first to be the right answer. TODO, use summation of points.
1427                         } else {
1428                                 $answers[$_POST['answer']] = 1;
1429                         }
1430
1431                         $sql_params = array(    $_POST['category_id'],
1432                                                                         $_course_id,
1433                                                                         $_POST['feedback'],
1434                                                                         $_POST['question'],
1435                                                                         $_POST['choice'][0],
1436                                                                         $_POST['choice'][1],
1437                                                                         $_POST['choice'][2],
1438                                                                         $_POST['choice'][3],
1439                                                                         $_POST['choice'][4],
1440                                                                         $_POST['choice'][5],
1441                                                                         $_POST['choice'][6],
1442                                                                         $_POST['choice'][7],
1443                                                                         $_POST['choice'][8],
1444                                                                         $_POST['choice'][9],
1445                                                                         $answers[0],
1446                                                                         $answers[1],
1447                                                                         $answers[2],
1448                                                                         $answers[3],
1449                                                                         $answers[4],
1450                                                                         $answers[5],
1451                                                                         $answers[6],
1452                                                                         $answers[7],
1453                                                                         $answers[8],
1454                                                                         $answers[9]);
1455
1456                         $sql = vsprintf(TR_SQL_QUESTION_MULTI, $sql_params);
1457 //                      $result = mysql_query($sql, $db);
1458 //                      if ($result==true){
1459                         $dao = new DAO();
1460                         if ($dao->execute($sql)) {
1461                                 return mysql_insert_id();
1462                         }
1463                 }
1464         }
1465 }
1466
1467 /**
1468 * multianswerQuestion
1469 *
1470 */
1471 class MultianswerQuestion extends MultichoiceQuestion {
1472         /*protected */ var $sPrefix  = 'multianswer';
1473         /*protected */ var $sNameVar = 'test_ma';
1474
1475         /*public */function mark($row) {
1476                 $num_correct = array_sum(array_slice($row, 3));
1477
1478                 if (is_array($_POST['answers'][$row['question_id']]) && count($_POST['answers'][$row['question_id']]) > 1) {
1479                         if (($i = array_search('-1', $_POST['answers'][$row['question_id']])) !== FALSE) {
1480                                 unset($_POST['answers'][$row['question_id']][$i]);
1481                         }
1482                         $num_answer_correct = 0;
1483                         foreach ($_POST['answers'][$row['question_id']] as $item_id => $answer) {
1484                                 if ($row['answer_' . $answer]) {
1485                                         // correct answer
1486                                         $num_answer_correct++;
1487                                 } else {
1488                                         // wrong answer
1489                                         $num_answer_correct--;
1490                                 }
1491                                 $_POST['answers'][$row['question_id']][$item_id] = intval($_POST['answers'][$row['question_id']][$item_id]);
1492                         }
1493                         if ($num_answer_correct == $num_correct) {
1494                                 $score = $row['weight'];
1495                         } else {
1496                                 $score = 0;
1497                         }
1498                         $_POST['answers'][$row['question_id']] = implode('|', $_POST['answers'][$row['question_id']]);
1499                 } else {
1500                         // no answer given
1501                         $_POST['answers'][$row['question_id']] = '-1'; // left blank
1502                         $score = 0;
1503                 }
1504                 return $score;
1505         }
1506
1507         //QTI Import multianswer Question
1508         function importQTI($_POST){
1509                 require_once(TR_INCLUDE_PATH.'classes/DAO/DAO.class.php');
1510                 require_once(TR_INCLUDE_PATH.'classes/Utility.class.php');
1511                 global $msg, $db, $_course_id;
1512 //              $_POST = $this->_POST;
1513
1514                 if ($_POST['question'] == ''){
1515                         $msg->addError(array('EMPTY_FIELDS', _AT('question')));
1516                 }
1517
1518                 //Multiple answer can have 0+ answers, in the QTIImport.class, if size(answer) < 2, answer will be came a scalar.
1519                 //The following code will change $_POST[answer] back to a vector.
1520                 $_POST['answer'] = $_POST['answers'];
1521
1522                 if (!$msg->containsErrors()) {
1523                         $choice_new = array(); // stores the non-blank choices
1524                         $answer_new = array(); // stores the associated "answer" for the choices
1525
1526                         foreach ($_POST['choice'] as $choiceNum=>$choiceOpt) {
1527                                 $choiceOpt = Utility::validateLength($choiceOpt, 255);
1528                                 $choiceOpt = trim($choiceOpt);
1529                                 $_POST['answer'][$choiceNum] = intval($_POST['answer'][$choiceNum]);
1530                                 if ($choiceOpt == '') {
1531                                         /* an empty option can't be correct */
1532                                         $_POST['answer'][$choiceNum] = 0;
1533                                 } else {
1534                                         /* filter out empty choices/ remove gaps */
1535                                         $choice_new[] = $choiceOpt;
1536                                         if (in_array($choiceNum, $_POST['answer'])){
1537                                                 $answer_new[] = 1;
1538                                         } else {
1539                                                 $answer_new[] = 0;
1540                                         }
1541
1542                                         if ($_POST['answer'][$choiceNum] != 0)
1543                                                 $has_answer = TRUE;
1544                                 }
1545                         }
1546
1547                         if ($has_answer != TRUE) {
1548
1549                                 $hidden_vars['required']    = htmlspecialchars($_POST['required']);
1550                                 $hidden_vars['feedback']    = htmlspecialchars($_POST['feedback']);
1551                                 $hidden_vars['question']    = htmlspecialchars($_POST['question']);
1552                                 $hidden_vars['category_id'] = htmlspecialchars($_POST['category_id']);
1553
1554                                 for ($i = 0; $i < count($choice_new); $i++) {
1555                                         $hidden_vars['answer['.$i.']'] = htmlspecialchars($answer_new[$i]);
1556                                         $hidden_vars['choice['.$i.']'] = htmlspecialchars($choice_new[$i]);
1557                                 }
1558
1559                                 $msg->addConfirm('NO_ANSWER', $hidden_vars);
1560                         } else {
1561                                 //add slahes throughout - does that fix it?
1562                                 $_POST['answer'] = $answer_new;
1563                                 $_POST['choice'] = $choice_new;
1564                                 $_POST['answer'] = array_pad($_POST['answer'], 10, 0);
1565                                 $_POST['choice'] = array_pad($_POST['choice'], 10, '');
1566
1567 //                              $_POST['feedback'] = $addslashes($_POST['feedback']);
1568 //                              $_POST['question'] = $addslashes($_POST['question']);
1569
1570                                 $sql_params = array(    $_POST['category_id'],
1571                                                                                 $_course_id,
1572                                                                                 $_POST['feedback'],
1573                                                                                 $_POST['question'],
1574                                                                                 $_POST['choice'][0],
1575                                                                                 $_POST['choice'][1],
1576                                                                                 $_POST['choice'][2],
1577                                                                                 $_POST['choice'][3],
1578                                                                                 $_POST['choice'][4],
1579                                                                                 $_POST['choice'][5],
1580                                                                                 $_POST['choice'][6],
1581                                                                                 $_POST['choice'][7],
1582                                                                                 $_POST['choice'][8],
1583                                                                                 $_POST['choice'][9],
1584                                                                                 $_POST['answer'][0],
1585                                                                                 $_POST['answer'][1],
1586                                                                                 $_POST['answer'][2],
1587                                                                                 $_POST['answer'][3],
1588                                                                                 $_POST['answer'][4],
1589                                                                                 $_POST['answer'][5],
1590                                                                                 $_POST['answer'][6],
1591                                                                                 $_POST['answer'][7],
1592                                                                                 $_POST['answer'][8],
1593                                                                                 $_POST['answer'][9]);
1594
1595                                 $sql = vsprintf(TR_SQL_QUESTION_MULTIANSWER, $sql_params);
1596
1597 //                              $result = mysql_query($sql, $db);
1598 //                              if ($result==true){
1599                                 $dao = new DAO();
1600                                 if ($dao->execute($sql)) {
1601                                         return mysql_insert_id();
1602                                 }
1603                         }
1604                 }
1605         }
1606
1607 }
1608 ?>