include/classes/testQuestions.class.php

   1 <?php
   2 /****************************************************************/
   3 /* ATutor                                                                                                               */
   4 /****************************************************************/
   5 /* Copyright (c) 2002-2008 by Greg Gay & Joel Kronenberg        */
   6 /* Adaptive Technology Resource Centre / University of Toronto  */
   7 /* http://atutor.ca                                                                                             */
   8 /*                                                              */
   9 /* This program is free software. You can redistribute it and/or*/
  10 /* modify it under the terms of the GNU General Public License  */
  11 /* as published by the Free Software Foundation.                                */
  12 /****************************************************************/
  13 // $Id$
  14 require(AT_INCLUDE_PATH.'lib/test_question_queries.inc.php');
  15
  16 /*
  17  * Steps to follow when adding a new question type:
  18  *
  19  * 1 - Create a class extending AbstractQuestion or extend an
  20  *     existing question class.
  21  *     Define $sPrefix and $sNameVar appropriately.
  22  *     Implement the following methods, which set template variables:
  23  *
  24  *        assignQTIVariables()
  25  *        assignDisplayResultVariables()
  26  *        assignDisplayVariables()
  27  *        assignDisplayStatisticsVariables()
  28  *                importQti()
  29  *
  30  *     And implement mark() which is used for marking the result.
  31  *
  32  * 2 - Add the new class name to $question_classes in test_question_factory()
  33  *
  34  * 3 - Add $sNameVar to the language database.
  35  *
  36  * 4 - Create the following files for creating and editing the question,
  37  *     where "{PREFIX}" is the value defined by $sPrefix:
  38  *
  39  *     /tools/tests/create_question_{PREFIX}.php
  40  *     /tools/tests/edit_question_{PREFIX}.php
  41  *
  42  * 5 - Add those two newly created pages to
  43  *     /mods/_standard/tests/module.php
  44  *
  45  * 6 - Create the following template files:
  46  *
  47  *     /themes/default/test_questions/{PREFIX}.tmpl.php
  48  *     /themes/default/test_questions/{PREFIX}_qti_2p1.tmpl.php
  49  *     /themes/default/test_questions/{PREFIX}_result.tmpl.php
  50  *     /themes/default/test_questions/{PREFIX}_stats.tmpl.php
  51  *
  52  * 7 - Add the new question type to qti import/export tools,
  53  *     Implement the following methods, which set template variables:
  54  *
  55  *     include/classes/QTI/QTIParser.class.php
  56  *         getQuestionType()
  57  *
  58  * 8 - Done!
  59  **/
  60 class TestQuestions {
  61         // returns array of prefix => name, sorted!
  62         /*static */function getQuestionPrefixNames() {
  63                 $question_prefix_names = array(); // prefix => name
  64                 $questions = TestQuestions::getQuestionClasses();
  65                 foreach ($questions as $type => $question) {
  66                         $o = TestQuestions::getQuestion($type);
  67                         $question_prefix_names[$o->getPrefix()] = $o->getName();
  68                 }
  69                 asort($question_prefix_names);
  70                 return $question_prefix_names;
  71         }
  72
  73         /*static */function getQuestionClasses() {
  74                 /** NOTE: The indices are CONSTANTS. Do NOT change!! **/
  75                 $question_classes = array(); // type ID => class name
  76                 $question_classes[1] = 'MultichoiceQuestion';
  77                 $question_classes[2] = 'TruefalseQuestion';
  78                 $question_classes[3] = 'LongQuestion';
  79                 $question_classes[4] = 'LikertQuestion';
  80                 $question_classes[5] = 'MatchingQuestion';
  81                 $question_classes[6] = 'OrderingQuestion';
  82                 $question_classes[7] = 'MultianswerQuestion';
  83                 $question_classes[8] = 'MatchingddQuestion';
  84
  85                 return $question_classes;
  86         }
  87
  88         /**
  89          * Used to create question objects based on $question_type.
  90          * A singleton that creates one obj per question since
  91          * questions are all stateless.
  92          * Returns a reference to the question object.
  93          */
  94         /*static */function & getQuestion($question_type) {
  95                 static $objs, $question_classes;
  96
  97                 if (isset($objs[$question_type])) {
  98                         return $objs[$question_type];
  99                 }
 100
 101                 $question_classes = TestQuestions::getQuestionClasses();
 102
 103                 if (isset($question_classes[$question_type])) {
 104                         global $savant;
 105                         $objs[$question_type] =& new $question_classes[$question_type]($savant);
 106                 } else {
 107                         return FALSE;
 108                 }
 109
 110                 return $objs[$question_type];
 111         }
 112 }
 113
 114 /**
 115  * Export test questions
 116  * @param       array   an array consist of all the ids of the questions in which we desired to export.
 117  */
 118 function test_question_qti_export_v2p1($question_ids) {
 119         require(AT_INCLUDE_PATH.'classes/zipfile.class.php'); // for zipfile
 120         require(AT_INCLUDE_PATH.'lib/html_resource_parser.inc.php'); // for get_html_resources()
 121         require(AT_INCLUDE_PATH.'classes/XML/XML_HTMLSax/XML_HTMLSax.php');     // for XML_HTMLSax
 122
 123         global $savant, $db, $system_courses, $languageManager;
 124
 125         $course_language = $system_courses[$_SESSION['course_id']]['primary_language'];
 126         $courseLanguage =& $languageManager->getLanguage($course_language);
 127         $course_language_charset = $courseLanguage->getCharacterSet();
 128
 129         $zipfile = new zipfile();
 130         $zipfile->create_dir('resources/'); // for all the dependency files
 131         $resources    = array();
 132         $dependencies = array();
 133
 134         asort($question_ids);
 135
 136         $question_ids_delim = implode(',',$question_ids);
 137
 138         $sql = "SELECT * FROM ".TABLE_PREFIX."tests_questions WHERE course_id=$_SESSION[course_id] AND question_id IN($question_ids_delim)";
 139         $result = mysql_query($sql, $db);
 140         while ($row = mysql_fetch_assoc($result)) {
 141                 $obj = TestQuestions::getQuestion($row['type']);
 142                 $xml = $obj->exportQTI($row, $course_language_charset, '2.1');
 143                 $local_dependencies = array();
 144
 145                 $text_blob = implode(' ', $row);
 146                 $local_dependencies = get_html_resources($text_blob);
 147                 $dependencies = array_merge($dependencies, $local_dependencies);
 148
 149                 $resources[] = array('href'         => 'question_'.$row['question_id'].'.xml',
 150                                                          'dependencies' => array_keys($local_dependencies));
 151
 152                 //TODO
 153                 $savant->assign('xml_content', $xml);
 154                 $savant->assign('title', $row['question']);
 155                 $xml = $savant->fetch('test_questions/wrapper.tmpl.php');
 156
 157                 $zipfile->add_file($xml, 'question_'.$row['question_id'].'.xml');
 158         }
 159
 160         // add any dependency files:
 161         foreach ($dependencies as $resource => $resource_server_path) {
 162                 $zipfile->add_file(@file_get_contents($resource_server_path), 'resources/' . $resource, filemtime($resource_server_path));
 163         }
 164
 165         // construct the manifest xml
 166         $savant->assign('resources', $resources);
 167         $savant->assign('dependencies', array_keys($dependencies));
 168         $savant->assign('encoding', $course_language_charset);
 169         $manifest_xml = $savant->fetch('test_questions/manifest_qti_2p1.tmpl.php');
 170
 171         $zipfile->add_file($manifest_xml, 'imsmanifest.xml');
 172
 173         $zipfile->close();
 174
 175         $filename = str_replace(array(' ', ':'), '_', $_SESSION['course_title'].'-'._AT('question_database').'-'.date('Ymd'));
 176         $zipfile->send_file($filename);
 177         exit;
 178 }
 179
 180
 181 /**
 182  * Export test questions
 183  * @param       array   an array consist of all the ids of the questions in which we desired to export.
 184  */
 185 function test_question_qti_export($question_ids) {
 186         require(AT_INCLUDE_PATH.'classes/zipfile.class.php'); // for zipfile
 187         require(AT_INCLUDE_PATH.'lib/html_resource_parser.inc.php'); // for get_html_resources()
 188         require(AT_INCLUDE_PATH.'classes/XML/XML_HTMLSax/XML_HTMLSax.php');     // for XML_HTMLSax
 189
 190         global $savant, $db, $system_courses, $languageManager;
 191
 192         $course_language = $system_courses[$_SESSION['course_id']]['primary_language'];
 193         $courseLanguage =& $languageManager->getLanguage($course_language);
 194         $course_language_charset = $courseLanguage->getCharacterSet();
 195
 196         $zipfile = new zipfile();
 197         $zipfile->create_dir('resources/'); // for all the dependency files
 198         $resources    = array();
 199         $dependencies = array();
 200
 201         asort($question_ids);
 202
 203         $question_ids_delim = implode(',',$question_ids);
 204
 205         $sql = "SELECT * FROM ".TABLE_PREFIX."tests_questions WHERE course_id=$_SESSION[course_id] AND question_id IN($question_ids_delim)";
 206         $result = mysql_query($sql, $db);
 207         while ($row = mysql_fetch_assoc($result)) {
 208                 $obj = TestQuestions::getQuestion($row['type']);
 209                 $local_xml = '';
 210                 $local_xml = $obj->exportQTI($row, $course_language_charset, '1.2.1');
 211                 $local_dependencies = array();
 212
 213                 $text_blob = implode(' ', $row);
 214                 $local_dependencies = get_html_resources($text_blob);
 215                 $dependencies = array_merge($dependencies, $local_dependencies);
 216
 217 //              $resources[] = array('href'         => 'question_'.$row['question_id'].'.xml',
 218 //                                                       'dependencies' => array_keys($local_dependencies));
 219
 220                 $xml = $xml . "\n\n" . $local_xml;
 221         }
 222         $xml = trim($xml);
 223
 224         //TODO
 225         $savant->assign('xml_content', $xml);
 226         $savant->assign('title', $row['question']);
 227         $xml = $savant->fetch('test_questions/wrapper.tmpl.php');
 228
 229         $xml_filename = 'atutor_questions.xml';
 230         $zipfile->add_file($xml, $xml_filename);
 231
 232         // add any dependency files:
 233         foreach ($dependencies as $resource => $resource_server_path) {
 234                 $zipfile->add_file(@file_get_contents($resource_server_path), 'resources/' . $resource, filemtime($resource_server_path));
 235         }
 236
 237         // construct the manifest xml
 238 //      $savant->assign('resources', $resources);
 239         $savant->assign('dependencies', array_keys($dependencies));
 240         $savant->assign('encoding', $course_language_charset);
 241         $savant->assign('xml_filename', $xml_filename);
 242 //      $manifest_xml = $savant->fetch('test_questions/manifest_qti_2p1.tmpl.php');
 243         $manifest_xml = $savant->fetch('test_questions/manifest_qti_1p2.tmpl.php');
 244
 245         $zipfile->add_file($manifest_xml, 'imsmanifest.xml');
 246
 247         $zipfile->close();
 248
 249         $filename = str_replace(array(' ', ':'), '_', $_SESSION['course_title'].'-'._AT('question_database').'-'.date('Ymd'));
 250         $zipfile->send_file($filename);
 251         exit;
 252 }
 253
 254
 255 /**
 256  * Export test
 257  * @param       int             test id
 258  * @param       string  the test title
 259  * @param       ref             [OPTIONAL] zip object reference
 260  * @param       array   [OPTIONAL] list of already added files.
 261  */
 262 function test_qti_export($tid, $test_title='', $zipfile = null){
 263         require_once(AT_INCLUDE_PATH.'classes/zipfile.class.php'); // for zipfile
 264         require_once(AT_INCLUDE_PATH.'classes/XML/XML_HTMLSax/XML_HTMLSax.php');        // for XML_HTMLSax
 265         require_once(AT_INCLUDE_PATH.'lib/html_resource_parser.inc.php'); // for get_html_resources()
 266         global $savant, $db, $system_courses, $languageManager, $test_zipped_files, $test_files, $use_cc;
 267         global $course_id;
 268
 269         $course_language = $system_courses[$_SESSION['course_id']]['primary_language'];
 270         $courseLanguage =& $languageManager->getLanguage($course_language);
 271         $course_language_charset = $courseLanguage->getCharacterSet();
 272         $imported_files;
 273         $zipflag = false;
 274
 275         if ($zipfile==null){
 276                 $zipflag = true;
 277         }
 278
 279         if ($test_zipped_files == null){
 280                 $test_zipped_files = array();
 281         }
 282
 283         if ($zipflag){
 284                 $zipfile = new zipfile();
 285                 $zipfile->create_dir('resources/'); // for all the dependency files
 286         }
 287         $resources    = array();
 288         $dependencies = array();
 289
 290 //      don't want to sort it, i want the same order out.
 291 //      asort($question_ids);
 292
 293         //TODO: Merge the following 2 sqls together.
 294         //Randomized or not, export all the questions that are associated with it.
 295         $sql    = "SELECT TQ.question_id, TQA.weight FROM ".TABLE_PREFIX."tests_questions TQ INNER JOIN ".TABLE_PREFIX."tests_questions_assoc TQA USING (question_id) WHERE TQ.course_id=$_SESSION[course_id] AND TQA.test_id=$tid ORDER BY TQA.ordering, TQA.question_id";
 296         $result = mysql_query($sql, $db);
 297         $question_ids = array();
 298
 299         while (($question_row = mysql_fetch_assoc($result)) != false){
 300                 $question_ids[] = $question_row['question_id'];
 301         }
 302         $question_ids_delim = implode(',',$question_ids);
 303
 304         //No questions in the test
 305         if (sizeof($question_ids_delim)==0){
 306                 return;
 307         }
 308
 309         //$sql = "SELECT * FROM ".TABLE_PREFIX."tests_questions WHERE course_id=$_SESSION[course_id] AND question_id IN($question_ids_delim)";
 310         $sql = "SELECT TQ.*, TQA.weight, TQA.test_id FROM ".TABLE_PREFIX."tests_questions TQ INNER JOIN ".TABLE_PREFIX."tests_questions_assoc TQA USING (question_id) WHERE TQA.test_id=$tid AND TQ.question_id IN($question_ids_delim) ORDER BY TQA.ordering, TQA.question_id";
 311
 312         $result = mysql_query($sql, $db);
 313         while ($row = mysql_fetch_assoc($result)) {
 314                 $obj = TestQuestions::getQuestion($row['type']);
 315                 $local_xml = '';
 316                 $local_xml = $obj->exportQTI($row, $course_language_charset, '1.2.1');
 317                 $local_dependencies = array();
 318
 319                 $text_blob = implode(' ', $row);
 320                 $local_dependencies = get_html_resources($text_blob);
 321                 $dependencies = array_merge($dependencies, $local_dependencies);
 322
 323                 $xml = $xml . "\n\n" . $local_xml;
 324         }
 325
 326         //files that are found inside the test; used by print_organization(), to add all test files into QTI/ folder.
 327         $test_files = $dependencies;
 328
 329         $resources[] = array('href'         => 'tests_'.$tid.'.xml',
 330                                                  'dependencies' => array_keys($dependencies));
 331
 332         $xml = trim($xml);
 333
 334         //get test title
 335         $sql = "SELECT title FROM ".TABLE_PREFIX."tests WHERE test_id = $tid";
 336         $result = mysql_query($sql, $db);
 337         $row = mysql_fetch_array($result);
 338
 339         //TODO: wrap around xml now
 340         $savant->assign('xml_content', $xml);
 341         $savant->assign('title', htmlspecialchars($row['title'], ENT_QUOTES, 'UTF-8'));
 342         $xml = $savant->fetch('test_questions/wrapper.tmpl.php');
 343
 344         $xml_filename = 'tests_'.$tid.'.xml';
 345         if (!$use_cc){
 346                 $zipfile->add_file($xml, $xml_filename);
 347         } else {
 348                 $zipfile->add_file($xml, 'QTI/'.$xml_filename);
 349         }
 350
 351         // add any dependency files:
 352         if (!$use_cc){
 353                 foreach ($dependencies as $resource => $resource_server_path) {
 354                         //add this file in if it's not already in the zip package
 355                         if (!in_array($resource_server_path, $test_zipped_files)){
 356                                 $zipfile->add_file(@file_get_contents($resource_server_path), 'resources/'.$resource, filemtime($resource_server_path));
 357                                 $test_zipped_files[] = $resource_server_path;
 358                         }
 359                 }
 360         }
 361
 362         if ($zipflag){
 363                 // construct the manifest xml
 364                 $savant->assign('resources', $resources);
 365                 $savant->assign('dependencies', array_keys($dependencies));
 366                 $savant->assign('encoding', $course_language_charset);
 367                 $savant->assign('title', $test_title);
 368                 $savant->assign('xml_filename', $xml_filename);
 369
 370                 $manifest_xml = $savant->fetch('test_questions/manifest_qti_1p2.tmpl.php');
 371                 $zipfile->add_file($manifest_xml, 'imsmanifest.xml');
 372
 373                 $zipfile->close();
 374
 375                 $filename = str_replace(array(' ', ':'), '_', $_SESSION['course_title'].'-'.$test_title.'-'.date('Ymd'));
 376                 $zipfile->send_file($filename);
 377                 exit;
 378         }
 379
 380         $return_array[$xml_filename] = array_keys($dependencies);
 381         return $return_array;
 382         //done
 383 }
 384
 385
 386 /*
 387  * Recursively create folders
 388  * For the purpose of this webapp only.  All the paths are seperated by a /
 389  * And thus this function will loop through each directory and create them on the way
 390  * if it doesn't exist.
 391  * @author harris
 392  */
 393 function recursive_mkdir($path, $mode = 0700) {
 394     $dirs = explode(DIRECTORY_SEPARATOR , $path);
 395     $count = count($dirs);
 396     $path = '';
 397     for ($i = 0; $i < $count; ++$i) {
 398         $path .= $dirs[$i].DIRECTORY_SEPARATOR;
 399                 //If the directory has not been created, create it and return error on failure
 400         if (!is_dir($path) && !mkdir($path, $mode)) {
 401             return false;
 402         }
 403     }
 404     return true;
 405 }
 406
 407
 408 /**
 409 * keeps count of the question number (when displaying the question)
 410 * need this function because PHP 4 doesn't support static members
 411 */
 412 function TestQuestionCounter($increment = FALSE) {
 413         static $count;
 414
 415         if (!isset($count)) {
 416                 $count = 0;
 417         }
 418         if ($increment) {
 419                 $count++;
 420         }
 421
 422         return $count;
 423 }
 424
 425
 426 /**
 427  * testQuestion
 428  *
 429  * Note that all PHP 5 OO declarations and signatures are commented out to be
 430  * backwards compatible with PHP 4.
 431  *
 432  */
 433 /*abstract */ class AbstractTestQuestion  {
 434         /**
 435         * Savant2 $savant - refrence to the savant obj
 436         */
 437         /*protected */ var $savant;
 438
 439         /**
 440         * Constructor method.  Initialises variables.
 441         */
 442         function AbstractTestQuestion(&$savant) { $this->savant =& $savant; }
 443
 444         /**
 445         * Public
 446         */
 447         /*final public */function seed($salt) {
 448                 /**
 449                 * by controlling the seed before calling array_rand() we insure that
 450                 * we can un-randomize the order for marking.
 451                 * used with ordering type questions only.
 452                 */
 453                 srand($salt + $_SESSION['member_id']);
 454         }
 455
 456         /**
 457         * Public
 458         */
 459         /*final public */function unseed() {
 460                 // To fix http://www.atutor.ca/atutor/mantis/view.php?id=3167
 461                 // Disturb the seed for ordering questions after mark to avoid the deterioration
 462                 // of the random distribution due to a repeated initialization of the same random seed
 463                 list($usec, $sec) = explode(" ", microtime());
 464                 srand((int)($usec*10));
 465         }
 466
 467         /**
 468         * Public
 469         * Prints the name of this question
 470         */
 471         /*final public */function printName() { echo $this->getName(); }
 472
 473         /**
 474         * Public
 475         * Prints the name of this question
 476         */
 477         /*final public */function getName() { return _AT($this->sNameVar); }
 478
 479         /**
 480         * Public
 481         * Returns the prefix string (used for file names)
 482         */
 483         /*final public */function getPrefix() { return $this->sPrefix; }
 484
 485         /**
 486         * Display the current question (for taking or previewing a test/question)
 487         */
 488         /*final public */function display($row, $response = '') {
 489                 // print the generic question header
 490                 $this->displayHeader($row['weight']);
 491
 492                 // print the question specific template
 493                 $this->assignDisplayVariables($row, $response);
 494                 $this->savant->display('test_questions/' . $this->sPrefix . '.tmpl.php');
 495
 496                 // print the generic question footer
 497                 $this->displayFooter();
 498         }
 499
 500         /**
 501         * Display the result for the current question
 502         */
 503         /*final public */function displayResult($row, $answer_row, $editable = FALSE) {
 504                 // print the generic question header
 505                 $this->displayHeader($row['weight'], $answer_row['score'], $editable ? $row['question_id'] : FALSE);
 506
 507                 // print the question specific template
 508                 $this->assignDisplayResultVariables($row, $answer_row);
 509                 $this->savant->display('test_questions/' . $this->sPrefix . '_result.tmpl.php');
 510
 511                 // print the generic question footer
 512                 $this->displayFooter();
 513         }
 514
 515
 516         /**
 517         * print the question template header
 518         */
 519         /*final public */function displayResultStatistics($row, $answers) {
 520                 TestQuestionCounter(TRUE);
 521                 $this->assignDisplayStatisticsVariables($row, $answers);
 522                 $this->savant->display('test_questions/' . $this->sPrefix . '_stats.tmpl.php');
 523         }
 524
 525         /*final public */function exportQTI($row, $encoding, $version) {
 526                 $this->savant->assign('encoding', $encoding);
 527                 //Convert all row values to html entities
 528                 foreach ($row as $k=>$v){
 529                         $row[$k] = htmlspecialchars($v, ENT_QUOTES, 'UTF-8');   //not using htmlentities cause it changes some languages falsely.
 530                 }
 531                 $this->assignQTIVariables($row);
 532                 if ($version=='2.1') {
 533                         $xml = $this->savant->fetch('test_questions/'. $this->sPrefix . '_qti_2p1.tmpl.php');
 534                 } else {
 535                         $xml = $this->savant->fetch('test_questions/'. $this->sPrefix . '_qti_1p2.tmpl.php');
 536                 }
 537                 return $xml;
 538         }
 539
 540         /**
 541         * print the question template header
 542         */
 543         /*final private */function displayHeader($weight, $score = FALSE, $question_id = FALSE) {
 544                 TestQuestionCounter(TRUE);
 545
 546                 if ($score) $score = intval($score);
 547                 $this->savant->assign('question_id', $question_id);
 548                 $this->savant->assign('score', $score);
 549                 $this->savant->assign('weight', $weight);
 550                 $this->savant->assign('type',   _AT($this->sNameVar));
 551                 $this->savant->assign('number', TestQuestionCounter());
 552                 $this->savant->display('test_questions/header.tmpl.php');
 553         }
 554
 555         /**
 556         * print the question template footer
 557         */
 558         /*final private */function displayFooter() {
 559                 $this->savant->display('test_questions/footer.tmpl.php');
 560         }
 561
 562         /**
 563         * return only the non-empty choices from $row.
 564         * assumes choices are sequential.
 565         */
 566         /*protected */function getChoices($row) {
 567                 $choices = array();
 568                 for ($i=0; $i < 10; $i++) {
 569                         if ($row['choice_'.$i] != '') {
 570                                 $num_choices++;
 571                                 $choices[] = $row['choice_'.$i];
 572                         } else {
 573                                 break;
 574                         }
 575                 }
 576                 return $choices;
 577         }
 578 }
 579
 580 /**
 581 * orderingQuestion
 582 *
 583 */
 584 class OrderingQuestion extends AbstractTestQuestion {
 585         /*protected */ var $sNameVar = 'test_ordering';
 586         /*protected */ var $sPrefix = 'ordering';
 587
 588         /*protected */function assignDisplayResultVariables($row, $answer_row) {
 589                 $answers = explode('|', $answer_row['answer']);
 590
 591                 $num_choices = count($this->getChoices($row));
 592
 593                 $this->savant->assign('base_href', AT_BASE_HREF);
 594                 $this->savant->assign('num_choices', $num_choices);
 595                 $this->savant->assign('answers', $answers);
 596                 $this->savant->assign('row', $row);
 597         }
 598
 599         /*protected */function assignQTIVariables($row) {
 600                 $choices = $this->getChoices($row);
 601                 $num_choices = count($choices);
 602
 603                 $this->savant->assign('num_choices', $num_choices);
 604                 $this->savant->assign('row', $row);
 605         }
 606
 607         /*protected */function assignDisplayVariables($row, $response) {
 608                 // determine the number of choices this question has
 609                 // and save those choices to be re-assigned back to $row
 610                 // in the randomized order.
 611                 $choices = $this->getChoices($row);
 612                 $num_choices = count($choices);
 613
 614                 // response from the test_answers table is in the correct order
 615                 // so, they have to be re-randomized in the same order as the
 616                 // choices are. this is only possible because of the seed() method.
 617                 $response = explode('|', $response);
 618                 $new_response = array();
 619
 620                 // randomize the order of choices and re-assign to $row
 621                 $this->seed($row['question_id']);
 622                 $rand = array_rand($choices, $num_choices);
 623                 for ($i=0; $i < 10; $i++) {
 624                         $row['choice_'.$i] = $choices[$rand[$i]];
 625                         $new_response[$i]  = $response[$rand[$i]];
 626                 }
 627
 628                 $this->savant->assign('num_choices', $num_choices);
 629                 $this->savant->assign('row', $row);
 630
 631                 $this->savant->assign('response', $new_response);
 632         }
 633
 634         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
 635                 $num_results = 0;
 636                 foreach ($answers as $answer) {
 637                         $num_results += $answer['count'];
 638                 }
 639
 640                 $choices = $this->getChoices($row);
 641                 $num_choices = count($choices);
 642
 643                 $final_answers = array(); // assoc array of # of times that key was used correctly 0, 1, ...  $num -1
 644                 foreach ($answers as $key => $value) {
 645                         $values = explode('|', $key);
 646                         // we assume $values is never empty and contains $num number of answers
 647                         for ($i=0; $i<=$num_choices; $i++) {
 648                                 if ($values[$i] == $i) {
 649                                         $final_answers[$i] += $answers[$key]['count'];
 650                                 }
 651                         }
 652                 }
 653
 654                 $this->savant->assign('num_results', $num_results);
 655                 $this->savant->assign('num_choices', $num_choices);
 656                 $this->savant->assign('answers', $final_answers);
 657                 $this->savant->assign('row', $row);
 658         }
 659
 660         /*public */function mark($row) {
 661                 $this->seed($row['question_id']);
 662                 $num_choices = count($_POST['answers'][$row['question_id']]);
 663                 $answers = range(0, $num_choices-1);
 664                 $answers = array_rand($answers, $num_choices);
 665
 666                 // Disturb the seed for ordering questions after mark to avoid the deterioration
 667                 // of the random distribution due to a repeated initialization of the same random seed
 668                 $this->unseed();
 669
 670                 $num_answer_correct = 0;
 671
 672                 $ordered_answers = array();
 673
 674                 for ($i = 0; $i < $num_choices ; $i++) {
 675                         $_POST['answers'][$row['question_id']][$i] = intval($_POST['answers'][$row['question_id']][$i]);
 676
 677                         if ($_POST['answers'][$row['question_id']][$i] == -1) {
 678                                 // nothing to do. it was left blank
 679                         } else if ($_POST['answers'][$row['question_id']][$i] == $answers[$i]) {
 680                                 $num_answer_correct++;
 681                         }
 682                         $ordered_answers[$answers[$i]] = $_POST['answers'][$row['question_id']][$i];
 683                 }
 684                 ksort($ordered_answers);
 685
 686                 $score = 0;
 687
 688                 // to avoid roundoff errors:
 689                 if ($num_answer_correct == $num_choices) {
 690                         $score = $row['weight'];
 691                 } else if ($num_answer_correct > 0) {
 692                         $score = number_format($row['weight'] / $num_choices * $num_answer_correct, 2);
 693                         if ( (float) (int) $score == $score) {
 694                                 $score = (int) $score; // a whole number with decimals, eg. "2.00"
 695                         } else {
 696                                 $score = trim($score, '0'); // remove trailing zeros, if any, eg. "2.50"
 697                         }
 698                 }
 699
 700                 $_POST['answers'][$row['question_id']] = implode('|', $ordered_answers);
 701
 702                 return $score;
 703         }
 704
 705         //QTI Import Ordering Question
 706         function importQTI($_POST){
 707                 global $msg, $db;
 708
 709                 if ($_POST['question'] == ''){
 710                         $missing_fields[] = _AT('question');
 711                 }
 712
 713                 if (trim($_POST['choice'][0]) == '') {
 714                         $missing_fields[] = _AT('item').' 1';
 715                 }
 716                 if (trim($_POST['choice'][1]) == '') {
 717                         $missing_fields[] = _AT('item').' 2';
 718                 }
 719
 720                 if ($missing_fields) {
 721                         $missing_fields = implode(', ', $missing_fields);
 722                         $msg->addError(array('EMPTY_FIELDS', $missing_fields));
 723                 }
 724
 725                 if (!$msg->containsErrors()) {
 726                         $choice_new = array(); // stores the non-blank choices
 727                         $answer_new = array(); // stores the non-blank answers
 728                         $order = 0; // order count
 729                         for ($i=0; $i<10; $i++) {
 730                                 /**
 731                                  * Db defined it to be 255 length, chop strings off it it's less than that
 732                                  * @harris
 733                                  */
 734                                 $_POST['choice'][$i] = validate_length($_POST['choice'][$i], 255);
 735                                 $_POST['choice'][$i] = trim($_POST['choice'][$i]);
 736
 737                                 if ($_POST['choice'][$i] != '') {
 738                                         /* filter out empty choices/ remove gaps */
 739                                         $choice_new[] = $_POST['choice'][$i];
 740                                         $answer_new[] = $order++;
 741                                 }
 742                         }
 743
 744                         $_POST['choice']   = array_pad($choice_new, 10, '');
 745                         $answer_new        = array_pad($answer_new, 10, 0);
 746 //                      $_POST['feedback'] = $addslashes($_POST['feedback']);
 747 //                      $_POST['question'] = $addslashes($_POST['question']);
 748
 749                         $sql_params = array(    $_POST['category_id'],
 750                                                                         $_SESSION['course_id'],
 751                                                                         $_POST['feedback'],
 752                                                                         $_POST['question'],
 753                                                                         $_POST['choice'][0],
 754                                                                         $_POST['choice'][1],
 755                                                                         $_POST['choice'][2],
 756                                                                         $_POST['choice'][3],
 757                                                                         $_POST['choice'][4],
 758                                                                         $_POST['choice'][5],
 759                                                                         $_POST['choice'][6],
 760                                                                         $_POST['choice'][7],
 761                                                                         $_POST['choice'][8],
 762                                                                         $_POST['choice'][9],
 763                                                                         $answer_new[0],
 764                                                                         $answer_new[1],
 765                                                                         $answer_new[2],
 766                                                                         $answer_new[3],
 767                                                                         $answer_new[4],
 768                                                                         $answer_new[5],
 769                                                                         $answer_new[6],
 770                                                                         $answer_new[7],
 771                                                                         $answer_new[8],
 772                                                                         $answer_new[9]);
 773
 774                         $sql = vsprintf(AT_SQL_QUESTION_ORDERING, $sql_params);
 775
 776                         $result = mysql_query($sql, $db);
 777                         if ($result==true){
 778                                 return mysql_insert_id();
 779                         }
 780                 }
 781         }
 782 }
 783
 784 /**
 785 * truefalseQuestion
 786 *
 787 */
 788 class TruefalseQuestion extends AbstracttestQuestion {
 789         /*protected */ var $sPrefix = 'truefalse';
 790         /*protected */ var $sNameVar   = 'test_tf';
 791
 792         /*protected */function assignQTIVariables($row) {
 793                 $this->savant->assign('row', $row);
 794         }
 795
 796         /*protected */function assignDisplayResultVariables($row, $answer_row) {
 797
 798                 $this->savant->assign('base_href', AT_BASE_HREF);
 799                 $this->savant->assign('answers', $answer_row['answer']);
 800                 $this->savant->assign('row', $row);
 801         }
 802
 803         /*protected */function assignDisplayVariables($row, $response) {
 804                 $this->savant->assign('row', $row);
 805                 $this->savant->assign('response', $response);
 806         }
 807
 808         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
 809                 $num_results = 0;
 810                 foreach ($answers as $answer) {
 811                         $num_results += $answer['count'];
 812                 }
 813
 814                 $this->savant->assign('num_results', $num_results);
 815                 $this->savant->assign('num_blanks', (int) $answers['-1']['count']);
 816                 $this->savant->assign('num_true', (int) $answers['1']['count']);
 817                 $this->savant->assign('num_false', (int) $answers['2']['count']);
 818                 $this->savant->assign('row', $row);
 819         }
 820
 821         /*public */function mark($row) {
 822                 $_POST['answers'][$row['question_id']] = intval($_POST['answers'][$row['question_id']]);
 823
 824                 if ($row['answer_0'] == $_POST['answers'][$row['question_id']]) {
 825                         return (int) $row['weight'];
 826                 } // else:
 827                 return 0;
 828         }
 829
 830         //QTI Import True/False Question
 831         function importQTI($_POST){
 832                 global $msg, $db;
 833
 834                 if ($_POST['question'] == ''){
 835                         $msg->addError(array('EMPTY_FIELDS', _AT('statement')));
 836                 }
 837
 838                 //assign true answer to 1, false answer to 2, idk to 3, for ATutor
 839                 if  ($_POST['answer'] == 'ChoiceT'){
 840                         $_POST['answer'] = 1;
 841                 } else {
 842                         $_POST['answer'] = 2;
 843                 }
 844
 845                 if (!$msg->containsErrors()) {
 846 //                      $_POST['feedback'] = $addslashes($_POST['feedback']);
 847 //                      $_POST['question'] = $addslashes($_POST['question']);
 848
 849
 850                         $sql_params = array(    $_POST['category_id'],
 851                                                                         $_SESSION['course_id'],
 852                                                                         $_POST['feedback'],
 853                                                                         $_POST['question'],
 854                                                                         $_POST['answer']);
 855
 856                         $sql = vsprintf(AT_SQL_QUESTION_TRUEFALSE, $sql_params);
 857                         $result = mysql_query($sql, $db);
 858                         if ($result==true){
 859                                 return mysql_insert_id();
 860                         }
 861                 }
 862         }
 863 }
 864
 865 /**
 866 * likertQuestion
 867 *
 868 */
 869 class LikertQuestion extends AbstracttestQuestion {
 870         /*protected */ var $sPrefix = 'likert';
 871         /*protected */ var $sNameVar   = 'test_lk';
 872
 873         /*protected */function assignQTIVariables($row) {
 874                 $choices = $this->getChoices($row);
 875                 $num_choices = count($choices);
 876
 877                 $this->savant->assign('num_choices', $num_choices);
 878                 $this->savant->assign('row', $row);
 879         }
 880
 881         /*protected */function assignDisplayResultVariables($row, $answer_row) {
 882                 $this->savant->assign('answer', $answer_row['answer']);
 883                 $this->savant->assign('row', $row);
 884         }
 885
 886         /*protected */function assignDisplayVariables($row, $response) {
 887                 $choices = $this->getChoices($row);
 888                 $num_choices = count($choices);
 889
 890                 $this->savant->assign('num_choices', $num_choices);
 891                 $this->savant->assign('row', $row);
 892
 893                 if (empty($response)) {
 894                         $response = -1;
 895                 }
 896                 $this->savant->assign('response', $response);
 897         }
 898
 899         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
 900                 $num_results = 0;
 901                 foreach ($answers as $answer) {
 902                         $num_results += $answer['count'];
 903                 }
 904
 905                 $choices = $this->getChoices($row);
 906                 $num_choices = count($choices);
 907
 908                 $sum = 0;
 909                 for ($i=0; $i<$num_choices; $i++) {
 910                         $sum += ($i+1) * $answers[$i]['count'];
 911                 }
 912                 $average = round($sum/$num_results, 1);
 913
 914                 $this->savant->assign('num_results', $num_results);
 915                 $this->savant->assign('average', $average);
 916                 $this->savant->assign('num_choices', $num_choices);
 917                 $this->savant->assign('num_blanks', (int) $answers['-1']['count']);
 918                 $this->savant->assign('answers', $answers);
 919                 $this->savant->assign('row', $row);
 920         }
 921
 922         /*public */function mark($row) {
 923                 $_POST['answers'][$row['question_id']] = intval($_POST['answers'][$row['question_id']]);
 924                 return 0;
 925         }
 926
 927         //QTI Import Likert Question
 928         function importQTI($_POST){
 929                 global $msg, $db;
 930 //              $_POST = $this->_POST;
 931
 932                 $empty_fields = array();
 933                 if ($_POST['question'] == ''){
 934                         $empty_fields[] = _AT('question');
 935                 }
 936                 if ($_POST['choice'][0] == '') {
 937                         $empty_fields[] = _AT('choice').' 1';
 938                 }
 939
 940                 if ($_POST['choice'][1] == '') {
 941                         $empty_fields[] = _AT('choice').' 2';
 942                 }
 943
 944                 if (!empty($empty_fields)) {
 945 //                      $msg->addError(array('EMPTY_FIELDS', implode(', ', $empty_fields)));
 946                 }
 947
 948                 if (!$msg->containsErrors()) {
 949                         $_POST['feedback']   = '';
 950 //                      $_POST['question']   = $addslashes($_POST['question']);
 951
 952                         for ($i=0; $i<10; $i++) {
 953                                 $_POST['choice'][$i] = trim($_POST['choice'][$i]);
 954                                 $_POST['answer'][$i] = intval($_POST['answer'][$i]);
 955
 956                                 if ($_POST['choice'][$i] == '') {
 957                                         /* an empty option can't be correct */
 958                                         $_POST['answer'][$i] = 0;
 959                                 }
 960                         }
 961
 962                         $sql_params = array(    $_POST['category_id'],
 963                                                                         $_SESSION['course_id'],
 964                                                                         $_POST['feedback'],
 965                                                                         $_POST['question'],
 966                                                                         $_POST['choice'][0],
 967                                                                         $_POST['choice'][1],
 968                                                                         $_POST['choice'][2],
 969                                                                         $_POST['choice'][3],
 970                                                                         $_POST['choice'][4],
 971                                                                         $_POST['choice'][5],
 972                                                                         $_POST['choice'][6],
 973                                                                         $_POST['choice'][7],
 974                                                                         $_POST['choice'][8],
 975                                                                         $_POST['choice'][9],
 976                                                                         $_POST['answer'][0],
 977                                                                         $_POST['answer'][1],
 978                                                                         $_POST['answer'][2],
 979                                                                         $_POST['answer'][3],
 980                                                                         $_POST['answer'][4],
 981                                                                         $_POST['answer'][5],
 982                                                                         $_POST['answer'][6],
 983                                                                         $_POST['answer'][7],
 984                                                                         $_POST['answer'][8],
 985                                                                         $_POST['answer'][9]);
 986
 987                         $sql = vsprintf(AT_SQL_QUESTION_LIKERT, $sql_params);
 988                         $result = mysql_query($sql, $db);
 989                         if ($result==true){
 990                                 return mysql_insert_id();
 991                         }
 992                 }
 993         }
 994 }
 995
 996 /**
 997 * longQuestion
 998 *
 999 */
1000 class LongQuestion extends AbstracttestQuestion {
1001         /*protected */ var $sPrefix = 'long';
1002         /*protected */ var $sNameVar = 'test_open';
1003
1004         /*protected */function assignQTIVariables($row) {
1005                 $this->savant->assign('row', $row);
1006         }
1007
1008         /*protected */function assignDisplayResultVariables($row, $answer_row) {
1009                 $this->savant->assign('answer', $answer_row['answer']);
1010                 $this->savant->assign('row', $row);
1011         }
1012
1013         /*protected */function assignDisplayVariables($row, $response) {
1014                 $this->savant->assign('row', $row);
1015                 $this->savant->assign('response', $response);
1016         }
1017
1018         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
1019                 $num_results = 0;
1020                 foreach ($answers as $answer) {
1021                         $num_results += $answer['count'];
1022                 }
1023
1024                 $this->savant->assign('num_results', $num_results);
1025                 $this->savant->assign('num_blanks', (int) $answers['']['count']);
1026                 $this->savant->assign('answers', $answers);
1027                 $this->savant->assign('row', $row);
1028         }
1029
1030         /*public */function mark($row) {
1031                 global $addslashes;
1032                 $_POST['answers'][$row['question_id']] = $addslashes($_POST['answers'][$row['question_id']]);
1033                 return NULL;
1034         }
1035
1036         //QTI Import Open end/long Question
1037         function importQTI($_POST){
1038                 global $msg, $db;
1039 //              $_POST = $this->_POST;
1040
1041                 if ($_POST['question'] == ''){
1042 //                      $msg->addError(array('EMPTY_FIELDS', _AT('question')));
1043                 }
1044
1045                 if (!$msg->containsErrors()) {
1046 //                      $_POST['feedback'] = $addslashes($_POST['feedback']);
1047 //                      $_POST['question'] = $addslashes($_POST['question']);
1048
1049                         if ($_POST['property']==''){
1050                                 $_POST['property'] = 4; //essay
1051                         }
1052
1053                         $sql_params = array(    $_POST['category_id'],
1054                                                                         $_SESSION['course_id'],
1055                                                                         $_POST['feedback'],
1056                                                                         $_POST['question'],
1057                                                                         $_POST['property']);
1058
1059                         $sql = vsprintf(AT_SQL_QUESTION_LONG, $sql_params);
1060
1061                         $result = mysql_query($sql, $db);
1062                         if ($result==true){
1063                                 return mysql_insert_id();
1064                         }
1065                 }
1066         }
1067 }
1068
1069 /**
1070 * matchingQuestion
1071 *
1072 */
1073 class MatchingQuestion extends AbstracttestQuestion {
1074         /*protected */ var $sPrefix = 'matching';
1075         /*protected */ var $sNameVar   = 'test_matching';
1076
1077         /*protected */function assignQTIVariables($row) {
1078                 $choices = $this->getChoices($row);
1079                 $num_choices = count($choices);
1080
1081                 $num_options = 0;
1082                 for ($i=0; $i < 10; $i++) {
1083                         if ($row['option_'. $i] != '') {
1084                                 $num_options++;
1085                         }
1086                 }
1087
1088                 $this->savant->assign('num_choices', $num_choices);
1089                 $this->savant->assign('num_options', $num_options);
1090                 $this->savant->assign('row', $row);
1091         }
1092
1093         /*protected */function assignDisplayResultVariables($row, $answer_row) {
1094                 $num_options = 0;
1095                 for ($i=0; $i < 10; $i++) {
1096                         if ($row['option_'. $i] != '') {
1097                                 $num_options++;
1098                         }
1099                 }
1100
1101                 $answer_row['answer'] = explode('|', $answer_row['answer']);
1102
1103                 global $_letters;
1104
1105                 $this->savant->assign('base_href', AT_BASE_HREF);
1106                 $this->savant->assign('answers', $answer_row['answer']);
1107                 $this->savant->assign('letters', $_letters);
1108                 $this->savant->assign('num_options', $num_options);
1109                 $this->savant->assign('row', $row);
1110         }
1111
1112         /*protected */function assignDisplayVariables($row, $response) {
1113                 $choices = $this->getChoices($row);
1114                 $num_choices = count($choices);
1115
1116                 if (empty($response)) {
1117                         $response = array_fill(0, $num_choices, -1);
1118                 } else {
1119                         $response = explode('|', $response);
1120                 }
1121
1122                 $num_options = 0;
1123                 for ($i=0; $i < 10; $i++) {
1124                         if ($row['option_'. $i] != '') {
1125                                 $num_options++;
1126                         }
1127                 }
1128
1129                 global $_letters;
1130
1131                 $this->savant->assign('num_choices', $num_choices);
1132                 $this->savant->assign('base_href', AT_BASE_HREF);
1133                 $this->savant->assign('letters', $_letters);
1134                 $this->savant->assign('num_options', $num_options);
1135                 $this->savant->assign('row', $row);
1136
1137                 $this->savant->assign('response', $response);
1138         }
1139
1140         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
1141                 $choices = $this->getChoices($row);
1142                 $num_choices = count($choices);
1143
1144                 $num_results = 0;
1145                 foreach ($answers as $answer) {
1146                         $num_results += $answer['count'];
1147                 }
1148
1149                 foreach ($answers as $key => $value) {
1150                         $values = explode('|', $key);
1151                         if (count($values) > 1) {
1152                                 for ($i=0; $i<count($values); $i++) {
1153                                         $answers[$values[$i]]['count']++;
1154                                 }
1155                         }
1156                 }
1157
1158                 $this->savant->assign('num_choices', $num_choices);
1159                 $this->savant->assign('num_results', $num_results);
1160                 $this->savant->assign('answers', $answers);
1161                 $this->savant->assign('row', $row);
1162         }
1163
1164         /*public */function mark($row) {
1165                 $num_choices = count($_POST['answers'][$row['question_id']]);
1166                 $num_answer_correct = 0;
1167                 foreach ($_POST['answers'][$row['question_id']] as $item_id => $response) {
1168                         if ($row['answer_' . $item_id] == $response) {
1169                                 $num_answer_correct++;
1170                         }
1171                         $_POST['answers'][$row['question_id']][$item_id] = intval($_POST['answers'][$row['question_id']][$item_id]);
1172                 }
1173
1174                 $score = 0;
1175                 // to avoid roundoff errors:
1176                 if ($num_answer_correct == $num_choices) {
1177                         $score = $row['weight'];
1178                 } else if ($num_answer_correct > 0) {
1179                         $score = number_format($row['weight'] / $num_choices * $num_answer_correct, 2);
1180                         if ( (float) (int) $score == $score) {
1181                                 $score = (int) $score; // a whole number with decimals, eg. "2.00"
1182                         } else {
1183                                 $score = trim($score, '0'); // remove trailing zeros, if any
1184                         }
1185                 }
1186
1187                 $_POST['answers'][$row['question_id']] = implode('|', $_POST['answers'][$row['question_id']]);
1188
1189                 return $score;
1190         }
1191
1192         //QTI Import Matching Question
1193         function importQTI($_POST){
1194                 global $msg, $db;
1195 //              $_POST = $this->_POST;
1196
1197                 if (!is_array($_POST['answer'])){
1198                         $temp = $_POST['answer'];
1199                         $_POST['answer'] = array();
1200                         $_POST['answer'][0] = $temp;
1201                 }
1202                 ksort($_POST['answer']);        //array_pad returns an array disregard of the array keys
1203                 //default for matching is '-'
1204                 $_POST['answer']= array_pad($_POST['answer'], 10, -1);
1205
1206                 for ($i = 0 ; $i < 10; $i++) {
1207                         $_POST['groups'][$i]        = trim($_POST['groups'][$i]);
1208                         $_POST['answer'][$i] = (int) $_POST['answer'][$i];
1209                         $_POST['choice'][$i]          = trim($_POST['choice'][$i]);
1210                 }
1211
1212                 if (!$_POST['groups'][0]
1213                         || !$_POST['groups'][1]
1214                         || !$_POST['choice'][0]
1215                         || !$_POST['choice'][1]) {
1216 //                      $msg->addError('QUESTION_EMPTY');
1217                 }
1218
1219                 if (!$msg->containsErrors()) {
1220 //                      $_POST['feedback']     = $addslashes($_POST['feedback']);
1221 //                      $_POST['instructions'] = $addslashes($_POST['instructions']);
1222
1223                         $sql_params = array(    $_POST['category_id'],
1224                                                                         $_SESSION['course_id'],
1225                                                                         $_POST['feedback'],
1226                                                                         $_POST['question'],
1227                                                                         $_POST['groups'][0],
1228                                                                         $_POST['groups'][1],
1229                                                                         $_POST['groups'][2],
1230                                                                         $_POST['groups'][3],
1231                                                                         $_POST['groups'][4],
1232                                                                         $_POST['groups'][5],
1233                                                                         $_POST['groups'][6],
1234                                                                         $_POST['groups'][7],
1235                                                                         $_POST['groups'][8],
1236                                                                         $_POST['groups'][9],
1237                                                                         $_POST['answer'][0],
1238                                                                         $_POST['answer'][1],
1239                                                                         $_POST['answer'][2],
1240                                                                         $_POST['answer'][3],
1241                                                                         $_POST['answer'][4],
1242                                                                         $_POST['answer'][5],
1243                                                                         $_POST['answer'][6],
1244                                                                         $_POST['answer'][7],
1245                                                                         $_POST['answer'][8],
1246                                                                         $_POST['answer'][9],
1247                                                                         $_POST['choice'][0],
1248                                                                         $_POST['choice'][1],
1249                                                                         $_POST['choice'][2],
1250                                                                         $_POST['choice'][3],
1251                                                                         $_POST['choice'][4],
1252                                                                         $_POST['choice'][5],
1253                                                                         $_POST['choice'][6],
1254                                                                         $_POST['choice'][7],
1255                                                                         $_POST['choice'][8],
1256                                                                         $_POST['choice'][9]);
1257
1258                         $sql = vsprintf(AT_SQL_QUESTION_MATCHINGDD, $sql_params);
1259
1260                         $result = mysql_query($sql, $db);
1261                         if ($result==true){
1262                                 return mysql_insert_id();
1263                         }
1264                 }
1265         }
1266 }
1267
1268 /**
1269 * matchingddQuestion
1270 *
1271 */
1272 class MatchingddQuestion extends MatchingQuestion {
1273         /*protected */ var $sPrefix = 'matchingdd';
1274         /*protected */ var $sNameVar   = 'test_matchingdd';
1275 }
1276
1277 /**
1278 * multichoiceQuestion
1279 *
1280 */
1281 class MultichoiceQuestion extends AbstracttestQuestion {
1282         /*protected */ var $sPrefix = 'multichoice';
1283         /*protected */var $sNameVar = 'test_mc';
1284
1285         /*protected */function assignQTIVariables($row) {
1286                 $choices = $this->getChoices($row);
1287                 $num_choices = count($choices);
1288
1289                 $this->savant->assign('num_choices', $num_choices);
1290                 $this->savant->assign('row', $row);
1291         }
1292
1293         /*protected */function assignDisplayResultVariables($row, $answer_row) {
1294                 if (strpos($answer_row['answer'], '|') !== false) {
1295                         $answer_row['answer'] = explode('|', $answer_row['answer']);
1296                 } else {
1297                         $answer_row['answer'] = array($answer_row['answer']);
1298                 }
1299
1300                 $this->savant->assign('base_href', AT_BASE_HREF);
1301                 $this->savant->assign('answers', $answer_row['answer']);
1302                 $this->savant->assign('row', $row);
1303         }
1304
1305         /*protected */function assignDisplayVariables($row, $response) {
1306                 $choices = $this->getChoices($row);
1307                 $num_choices = count($choices);
1308
1309                 if ($response == '') {
1310                         $response = -1;
1311                 }
1312                 $response = explode('|', $response);
1313                 $this->savant->assign('response', $response);
1314
1315                 $this->savant->assign('num_choices', $num_choices);
1316                 $this->savant->assign('row', $row);
1317         }
1318
1319         /*protected */function assignDisplayStatisticsVariables($row, $answers) {
1320                 $choices = $this->getChoices($row);
1321                 $num_choices = count($choices);
1322
1323                 $num_results = 0;
1324                 foreach ($answers as $answer) {
1325                         $num_results += $answer['count'];
1326                 }
1327
1328                 foreach ($answers as $key => $value) {
1329                         $values = explode('|', $key);
1330                         if (count($values) > 1) {
1331                                 for ($i=0; $i<count($values); $i++) {
1332                                         $answers[$values[$i]]['count']++;
1333                                 }
1334                         }
1335                 }
1336
1337                 $this->savant->assign('num_choices', $num_choices);
1338                 $this->savant->assign('num_results', $num_results);
1339                 $this->savant->assign('num_blanks', (int) $answers['-1']['count']);
1340                 $this->savant->assign('answers', $answers);
1341                 $this->savant->assign('row', $row);
1342         }
1343
1344         /*public */function mark($row) {
1345                 $score = 0;
1346                 $_POST['answers'][$row['question_id']] = intval($_POST['answers'][$row['question_id']]);
1347                 if ($row['answer_' . $_POST['answers'][$row['question_id']]]) {
1348                         $score = $row['weight'];
1349                 } else if ($_POST['answers'][$row['question_id']] == -1) {
1350                         $has_answer = 0;
1351                         for($i=0; $i<10; $i++) {
1352                                 $has_answer += $row['answer_'.$i];
1353                         }
1354                         if (!$has_answer && $row['weight']) {
1355                                 // If MC has no answer and user answered "leave blank"
1356                                 $score = $row['weight'];
1357                         }
1358                 }
1359                 return $score;
1360         }
1361
1362         //QTI Import Multiple Choice Question
1363         function importQTI($_POST){
1364                 global $msg, $db;
1365 //              $_POST = $this->_POST;
1366                 if ($_POST['question'] == ''){
1367                         $msg->addError(array('EMPTY_FIELDS', _AT('question')));
1368                 }
1369
1370                 if (!$msg->containsErrors()) {
1371 //                      $_POST['question']   = $addslashes($_POST['question']);
1372
1373                         for ($i=0; $i<10; $i++) {
1374                                 $_POST['choice'][$i] = trim($_POST['choice'][$i]);
1375                         }
1376
1377                         $answers = array_fill(0, 10, 0);
1378                         if (is_array($_POST['answer'])){
1379                                 $answers[0] = 1;        //default the first to be the right answer. TODO, use summation of points.
1380                         } else {
1381                                 $answers[$_POST['answer']] = 1;
1382                         }
1383
1384                         $sql_params = array(    $_POST['category_id'],
1385                                                                         $_SESSION['course_id'],
1386                                                                         $_POST['feedback'],
1387                                                                         $_POST['question'],
1388                                                                         $_POST['choice'][0],
1389                                                                         $_POST['choice'][1],
1390                                                                         $_POST['choice'][2],
1391                                                                         $_POST['choice'][3],
1392                                                                         $_POST['choice'][4],
1393                                                                         $_POST['choice'][5],
1394                                                                         $_POST['choice'][6],
1395                                                                         $_POST['choice'][7],
1396                                                                         $_POST['choice'][8],
1397                                                                         $_POST['choice'][9],
1398                                                                         $answers[0],
1399                                                                         $answers[1],
1400                                                                         $answers[2],
1401                                                                         $answers[3],
1402                                                                         $answers[4],
1403                                                                         $answers[5],
1404                                                                         $answers[6],
1405                                                                         $answers[7],
1406                                                                         $answers[8],
1407                                                                         $answers[9]);
1408
1409                         $sql = vsprintf(AT_SQL_QUESTION_MULTI, $sql_params);
1410                         $result = mysql_query($sql, $db);
1411                         if ($result==true){
1412                                 return mysql_insert_id();
1413                         }
1414                 }
1415         }
1416 }
1417
1418 /**
1419 * multianswerQuestion
1420 *
1421 */
1422 class MultianswerQuestion extends MultichoiceQuestion {
1423         /*protected */ var $sPrefix  = 'multianswer';
1424         /*protected */ var $sNameVar = 'test_ma';
1425
1426         /*public */function mark($row) {
1427                 $num_correct = array_sum(array_slice($row, 3));
1428
1429                 if (is_array($_POST['answers'][$row['question_id']]) && count($_POST['answers'][$row['question_id']]) > 1) {
1430                         if (($i = array_search('-1', $_POST['answers'][$row['question_id']])) !== FALSE) {
1431                                 unset($_POST['answers'][$row['question_id']][$i]);
1432                         }
1433                         $num_answer_correct = 0;
1434                         foreach ($_POST['answers'][$row['question_id']] as $item_id => $answer) {
1435                                 if ($row['answer_' . $answer]) {
1436                                         // correct answer
1437                                         $num_answer_correct++;
1438                                 } else {
1439                                         // wrong answer
1440                                         $num_answer_correct--;
1441                                 }
1442                                 $_POST['answers'][$row['question_id']][$item_id] = intval($_POST['answers'][$row['question_id']][$item_id]);
1443                         }
1444                         if ($num_answer_correct == $num_correct) {
1445                                 $score = $row['weight'];
1446                         } else {
1447                                 $score = 0;
1448                         }
1449                         $_POST['answers'][$row['question_id']] = implode('|', $_POST['answers'][$row['question_id']]);
1450                 } else {
1451                         // no answer given
1452                         $_POST['answers'][$row['question_id']] = '-1'; // left blank
1453                         $score = 0;
1454                 }
1455                 return $score;
1456         }
1457
1458         //QTI Import multianswer Question
1459         function importQTI($_POST){
1460                 global $msg, $db;
1461 //              $_POST = $this->_POST;
1462
1463                 if ($_POST['question'] == ''){
1464                         $msg->addError(array('EMPTY_FIELDS', _AT('question')));
1465                 }
1466
1467                 //Multiple answer can have 0+ answers, in the QTIImport.class, if size(answer) < 2, answer will be came a scalar.
1468                 //The following code will change $_POST[answer] back to a vector.
1469                 $_POST['answer'] = $_POST['answers'];
1470
1471                 if (!$msg->containsErrors()) {
1472                         $choice_new = array(); // stores the non-blank choices
1473                         $answer_new = array(); // stores the associated "answer" for the choices
1474
1475                         foreach ($_POST['choice'] as $choiceNum=>$choiceOpt) {
1476                                 $choiceOpt = validate_length($choiceOpt, 255);
1477                                 $choiceOpt = trim($choiceOpt);
1478                                 $_POST['answer'][$choiceNum] = intval($_POST['answer'][$choiceNum]);
1479                                 if ($choiceOpt == '') {
1480                                         /* an empty option can't be correct */
1481                                         $_POST['answer'][$choiceNum] = 0;
1482                                 } else {
1483                                         /* filter out empty choices/ remove gaps */
1484                                         $choice_new[] = $choiceOpt;
1485                                         if (in_array($choiceNum, $_POST['answer'])){
1486                                                 $answer_new[] = 1;
1487                                         } else {
1488                                                 $answer_new[] = 0;
1489                                         }
1490
1491                                         if ($_POST['answer'][$choiceNum] != 0)
1492                                                 $has_answer = TRUE;
1493                                 }
1494                         }
1495
1496                         if ($has_answer != TRUE) {
1497
1498                                 $hidden_vars['required']    = htmlspecialchars($_POST['required']);
1499                                 $hidden_vars['feedback']    = htmlspecialchars($_POST['feedback']);
1500                                 $hidden_vars['question']    = htmlspecialchars($_POST['question']);
1501                                 $hidden_vars['category_id'] = htmlspecialchars($_POST['category_id']);
1502
1503                                 for ($i = 0; $i < count($choice_new); $i++) {
1504                                         $hidden_vars['answer['.$i.']'] = htmlspecialchars($answer_new[$i]);
1505                                         $hidden_vars['choice['.$i.']'] = htmlspecialchars($choice_new[$i]);
1506                                 }
1507
1508                                 $msg->addConfirm('NO_ANSWER', $hidden_vars);
1509                         } else {
1510                                 //add slahes throughout - does that fix it?
1511                                 $_POST['answer'] = $answer_new;
1512                                 $_POST['choice'] = $choice_new;
1513                                 $_POST['answer'] = array_pad($_POST['answer'], 10, 0);
1514                                 $_POST['choice'] = array_pad($_POST['choice'], 10, '');
1515
1516 //                              $_POST['feedback'] = $addslashes($_POST['feedback']);
1517 //                              $_POST['question'] = $addslashes($_POST['question']);
1518
1519                                 $sql_params = array(    $_POST['category_id'],
1520                                                                                 $_SESSION['course_id'],
1521                                                                                 $_POST['feedback'],
1522                                                                                 $_POST['question'],
1523                                                                                 $_POST['choice'][0],
1524                                                                                 $_POST['choice'][1],
1525                                                                                 $_POST['choice'][2],
1526                                                                                 $_POST['choice'][3],
1527                                                                                 $_POST['choice'][4],
1528                                                                                 $_POST['choice'][5],
1529                                                                                 $_POST['choice'][6],
1530                                                                                 $_POST['choice'][7],
1531                                                                                 $_POST['choice'][8],
1532                                                                                 $_POST['choice'][9],
1533                                                                                 $_POST['answer'][0],
1534                                                                                 $_POST['answer'][1],
1535                                                                                 $_POST['answer'][2],
1536                                                                                 $_POST['answer'][3],
1537                                                                                 $_POST['answer'][4],
1538                                                                                 $_POST['answer'][5],
1539                                                                                 $_POST['answer'][6],
1540                                                                                 $_POST['answer'][7],
1541                                                                                 $_POST['answer'][8],
1542                                                                                 $_POST['answer'][9]);
1543
1544                                 $sql = vsprintf(AT_SQL_QUESTION_MULTIANSWER, $sql_params);
1545
1546                                 $result = mysql_query($sql, $db);
1547                                 if ($result==true){
1548                                         return mysql_insert_id();
1549                                 }
1550                         }
1551                 }
1552         }
1553
1554 }
1555 ?>