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lib.php
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lib.php
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<?PHP // $Id$
/// Library of function for module quiz
/// CONSTANTS ///////////////////////////////////////////////////////////////////
define("GRADEHIGHEST", "1");
define("GRADEAVERAGE", "2");
define("ATTEMPTFIRST", "3");
define("ATTEMPTLAST", "4");
$QUIZ_GRADE_METHOD = array ( GRADEHIGHEST => get_string("gradehighest", "quiz"),
GRADEAVERAGE => get_string("gradeaverage", "quiz"),
ATTEMPTFIRST => get_string("attemptfirst", "quiz"),
ATTEMPTLAST => get_string("attemptlast", "quiz"));
define("SHORTANSWER", "1");
define("TRUEFALSE", "2");
define("MULTICHOICE", "3");
define("RANDOM", "4");
define("MATCH", "5");
define("RANDOMSAMATCH", "6");
$QUIZ_QUESTION_TYPE = array ( MULTICHOICE => get_string("multichoice", "quiz"),
TRUEFALSE => get_string("truefalse", "quiz"),
SHORTANSWER => get_string("shortanswer", "quiz"),
MATCH => get_string("match", "quiz"),
RANDOM => get_string("random", "quiz"),
RANDOMSAMATCH => get_string("randomsamatch", "quiz") );
$QUIZ_FILE_FORMAT = array ( "custom" => get_string("custom", "quiz"),
"missingword" => get_string("missingword", "quiz"),
"blackboard" => get_string("blackboard", "quiz"),
"aon" => "AON"
);
define("QUIZ_PICTURE_MAX_HEIGHT", "600"); // Not currently implemented
define("QUIZ_PICTURE_MAX_WIDTH", "600"); // Not currently implemented
define("QUIZ_MAX_NUMBER_ANSWERS", "8");
/// FUNCTIONS ///////////////////////////////////////////////////////////////////
function quiz_add_instance($quiz) {
/// Given an object containing all the necessary data,
/// (defined by the form in mod.html) this function
/// will create a new instance and return the id number
/// of the new instance.
$quiz->created = time();
$quiz->timemodified = time();
$quiz->timeopen = make_timestamp($quiz->openyear, $quiz->openmonth, $quiz->openday,
$quiz->openhour, $quiz->openminute, 0);
$quiz->timeclose = make_timestamp($quiz->closeyear, $quiz->closemonth, $quiz->closeday,
$quiz->closehour, $quiz->closeminute, 0);
if (!$quiz->id = insert_record("quiz", $quiz)) {
return false; // some error occurred
}
// The grades for every question in this quiz are stored in an array
if ($quiz->grades) {
foreach ($quiz->grades as $question => $grade) {
if ($question and $grade) {
unset($questiongrade);
$questiongrade->quiz = $quiz->id;
$questiongrade->question = $question;
$questiongrade->grade = $grade;
if (!insert_record("quiz_question_grades", $questiongrade)) {
return false;
}
}
}
}
return $quiz->id;
}
function quiz_update_instance($quiz) {
/// Given an object containing all the necessary data,
/// (defined by the form in mod.html) this function
/// will update an existing instance with new data.
$quiz->timemodified = time();
$quiz->timeopen = make_timestamp($quiz->openyear, $quiz->openmonth, $quiz->openday,
$quiz->openhour, $quiz->openminute, 0);
$quiz->timeclose = make_timestamp($quiz->closeyear, $quiz->closemonth, $quiz->closeday,
$quiz->closehour, $quiz->closeminute, 0);
$quiz->id = $quiz->instance;
if (!update_record("quiz", $quiz)) {
return false; // some error occurred
}
// The grades for every question in this quiz are stored in an array
// Insert or update records as appropriate
$existing = get_records("quiz_question_grades", "quiz", $quiz->id, "", "question,grade,id");
if ($quiz->grades) {
foreach ($quiz->grades as $question => $grade) {
if ($question and $grade) {
unset($questiongrade);
$questiongrade->quiz = $quiz->id;
$questiongrade->question = $question;
$questiongrade->grade = $grade;
if (isset($existing[$question])) {
if ($existing[$question]->grade != $grade) {
$questiongrade->id = $existing[$question]->id;
if (!update_record("quiz_question_grades", $questiongrade)) {
return false;
}
}
} else {
if (!insert_record("quiz_question_grades", $questiongrade)) {
return false;
}
}
}
}
}
return true;
}
function quiz_delete_instance($id) {
/// Given an ID of an instance of this module,
/// this function will permanently delete the instance
/// and any data that depends on it.
if (! $quiz = get_record("quiz", "id", "$id")) {
return false;
}
$result = true;
if ($attempts = get_record("quiz_attempts", "quiz", "$quiz->id")) {
foreach ($attempts as $attempt) {
if (! delete_records("quiz_responses", "attempt", "$attempt->id")) {
$result = false;
}
}
}
if (! delete_records("quiz_attempts", "quiz", "$quiz->id")) {
$result = false;
}
if (! delete_records("quiz_grades", "quiz", "$quiz->id")) {
$result = false;
}
if (! delete_records("quiz_question_grades", "quiz", "$quiz->id")) {
$result = false;
}
if (! delete_records("quiz", "id", "$quiz->id")) {
$result = false;
}
return $result;
}
function quiz_user_outline($course, $user, $mod, $quiz) {
/// Return a small object with summary information about what a
/// user has done with a given particular instance of this module
/// Used for user activity reports.
/// $return->time = the time they did it
/// $return->info = a short text description
if ($grade = get_record("quiz_grades", "userid", $user->id, "quiz", $quiz->id)) {
if ($grade->grade) {
$result->info = get_string("grade").": $grade->grade";
}
$result->time = $grade->timemodified;
return $result;
}
return NULL;
return $return;
}
function quiz_user_complete($course, $user, $mod, $quiz) {
/// Print a detailed representation of what a user has done with
/// a given particular instance of this module, for user activity reports.
return true;
}
function quiz_cron () {
/// Function to be run periodically according to the moodle cron
/// This function searches for things that need to be done, such
/// as sending out mail, toggling flags etc ...
global $CFG;
return true;
}
function quiz_grades($quizid) {
/// Must return an array of grades, indexed by user, and a max grade.
$return->grades = get_records_menu("quiz_grades", "quiz", $quizid, "", "userid,grade");
$return->maxgrade = get_field("quiz", "grade", "id", "$quizid");
return $return;
}
/// SQL FUNCTIONS ////////////////////////////////////////////////////////////////////
function quiz_move_questions($category1, $category2) {
global $CFG;
return execute_sql("UPDATE {$CFG->prefix}quiz_questions
SET category = '$category2'
WHERE category = '$category1'",
false);
}
function quiz_get_question_grades($quizid, $questionlist) {
global $CFG;
return get_records_sql("SELECT question,grade
FROM {$CFG->prefix}quiz_question_grades
WHERE quiz = '$quizid'
AND question IN ($questionlist)");
}
function quiz_get_random_categories($questionlist) {
/// Given an array of questions, this function looks for random
/// questions among them and returns a list of categories with
/// an associated count of random questions for each.
global $CFG;
return get_records_sql_menu("SELECT category,count(*)
FROM {$CFG->prefix}quiz_questions
WHERE id IN ($questionlist)
AND qtype = '".RANDOM."'
GROUP BY category ");
}
function quiz_get_grade_records($quiz) {
/// Gets all info required to display the table of quiz results
/// for report.php
global $CFG;
return get_records_sql("SELECT qg.*, u.firstname, u.lastname, u.picture
FROM {$CFG->prefix}quiz_grades qg,
{$CFG->prefix}user u
WHERE qg.quiz = '$quiz->id'
AND qg.userid = u.id");
}
function quiz_get_answers($question) {
// Given a question, returns the correct answers for a given question
global $CFG;
switch ($question->qtype) {
case SHORTANSWER: // Could be multiple answers
return get_records_sql("SELECT a.*, sa.usecase
FROM {$CFG->prefix}quiz_shortanswer sa,
{$CFG->prefix}quiz_answers a
WHERE sa.question = '$question->id'
AND sa.question = a.question ");
break;
case TRUEFALSE: // Should be always two answers
return get_records("quiz_answers", "question", $question->id);
break;
case MULTICHOICE: // Should be multiple answers
return get_records_sql("SELECT a.*, mc.single
FROM {$CFG->prefix}quiz_multichoice mc,
{$CFG->prefix}quiz_answers a
WHERE mc.question = '$question->id'
AND mc.question = a.question ");
break;
case MATCH:
return get_records("quiz_match_sub", "question", $question->id);
break;
case RANDOMSAMATCH: // Could be any of many answers, return them all
return get_records_sql("SELECT a.*
FROM {$CFG->prefix}quiz_questions q,
{$CFG->prefix}quiz_answers a
WHERE q.category = '$question->category'
AND q.qtype = ".SHORTANSWER."
AND q.id = a.question ");
break;
default:
return false;
}
}
function quiz_get_attempt_responses($attempt, $quiz) {
// Given an attempt object, this function gets all the
// stored responses and returns them in a format suitable
// for regrading using quiz_grade_attempt_results()
global $CFG;
if (!$responses = get_records_sql("SELECT q.id, q.qtype, q.category, q.questiontext, r.answer
FROM {$CFG->prefix}quiz_responses r,
{$CFG->prefix}quiz_questions q
WHERE r.attempt = '$attempt->id'
AND q.id = r.question")) {
notify("Could not find any responses for that attempt!");
return false;
}
foreach ($responses as $key => $response) {
if ($response->qtype == RANDOM) {
$responses[$key]->random = $response->answer;
$responses[$key]->answer = explode(",",$responses[$response->answer]->answer);
$responses[$response->answer]->delete = true;
} else {
$responses[$key]->answer = explode(",",$response->answer);
}
}
foreach ($responses as $key => $response) {
if (!empty($response->delete)) {
unset($responses[$key]);
}
}
return $responses;
}
//////////////////////////////////////////////////////////////////////////////////////
/// Any other quiz functions go here. Each of them must have a name that
/// starts with quiz_
function quiz_print_comment($text) {
global $THEME;
echo "<SPAN CLASS=feedbacktext>".text_to_html($text, true, false)."</SPAN>";
}
function quiz_print_correctanswer($text) {
global $THEME;
echo "<P ALIGN=RIGHT><SPAN CLASS=highlight>$text</SPAN></P>";
}
function quiz_print_question_icon($question, $editlink=true) {
// Prints a question icon
global $QUIZ_QUESTION_TYPE;
if ($editlink) {
echo "<A HREF=\"question.php?id=$question->id\" TITLE=\"".$QUIZ_QUESTION_TYPE[$question->qtype]."\">";
}
switch ($question->qtype) {
case SHORTANSWER:
echo "<IMG BORDER=0 HEIGHT=16 WIDTH=16 SRC=\"pix/sa.gif\">";
break;
case TRUEFALSE:
echo "<IMG BORDER=0 HEIGHT=16 WIDTH=16 SRC=\"pix/tf.gif\">";
break;
case MULTICHOICE:
echo "<IMG BORDER=0 HEIGHT=16 WIDTH=16 SRC=\"pix/mc.gif\">";
break;
case RANDOM:
echo "<IMG BORDER=0 HEIGHT=16 WIDTH=16 SRC=\"pix/rs.gif\">";
break;
case MATCH:
echo "<IMG BORDER=0 HEIGHT=16 WIDTH=16 SRC=\"pix/ma.gif\">";
break;
case RANDOMSAMATCH:
echo "<IMG BORDER=0 HEIGHT=16 WIDTH=16 SRC=\"pix/rm.gif\">";
break;
}
if ($editlink) {
echo "</A>\n";
}
}
function quiz_print_question($number, $question, $grade, $courseid,
$feedback=NULL, $response=NULL, $actualgrade=NULL, $correct=NULL,
$realquestion=NULL, $shuffleanswers=false) {
/// Prints a quiz question, any format
/// $question is provided as an object
if (empty($actualgrade)) {
$actualgrade = 0;
}
$stranswer = get_string("answer", "quiz");
$strmarks = get_string("marks", "quiz");
echo "<TABLE WIDTH=100% CELLSPACING=10><TR><TD NOWRAP WIDTH=100 VALIGN=top>";
echo "<P ALIGN=CENTER><B>$number</B></P>";
if ($feedback or $response) {
echo "<P ALIGN=CENTER><FONT SIZE=1>$strmarks: $actualgrade/$grade</FONT></P>";
} else {
echo "<P ALIGN=CENTER><FONT SIZE=1>$grade $strmarks</FONT></P>";
}
print_spacer(1,100);
echo "</TD><TD VALIGN=TOP>";
if (empty($realquestion)) {
$realquestion->id = $question->id;
} else { // Add a marker to connect this question to the actual random parent
echo "<input type=\"hidden\" name=\"q{$realquestion->id}rq$question->id\" value=\"x\">\n";
}
switch ($question->qtype) {
case SHORTANSWER:
if (!$options = get_record("quiz_shortanswer", "question", $question->id)) {
notify("Error: Missing question options!");
}
echo text_to_html($question->questiontext);
if ($question->image) {
print_file_picture($question->image, $courseid);
}
if ($response) {
$value = "VALUE=\"$response[0]\"";
} else {
$value = "";
}
echo "<P ALIGN=RIGHT>$stranswer: <INPUT TYPE=TEXT NAME=q$realquestion->id SIZE=20 $value></P>";
if ($feedback) {
quiz_print_comment("<P ALIGN=right>$feedback[0]</P>");
}
if ($correct) {
$correctanswers = implode(", ", $correct);
quiz_print_correctanswer($correctanswers);
}
break;
case TRUEFALSE:
if (!$options = get_record("quiz_truefalse", "question", $question->id)) {
notify("Error: Missing question options!");
}
if (!$true = get_record("quiz_answers", "id", $options->trueanswer)) {
notify("Error: Missing question answers!");
}
if (!$false = get_record("quiz_answers", "id", $options->falseanswer)) {
notify("Error: Missing question answers!");
}
if (!$true->answer) {
$true->answer = get_string("true", "quiz");
}
if (!$false->answer) {
$false->answer = get_string("false", "quiz");
}
echo text_to_html($question->questiontext);
if ($question->image) {
print_file_picture($question->image, $courseid);
}
$truechecked = "";
$falsechecked = "";
if (!empty($response[$true->id])) {
$truechecked = "CHECKED";
$feedbackid = $true->id;
} else if (!empty($response[$false->id])) {
$falsechecked = "CHECKED";
$feedbackid = $false->id;
}
$truecorrect = "";
$falsecorrect = "";
if ($correct) {
if (!empty($correct[$true->id])) {
$truecorrect = "CLASS=highlight";
}
if (!empty($correct[$false->id])) {
$falsecorrect = "CLASS=highlight";
}
}
echo "<TABLE ALIGN=right cellpadding=5><TR><TD align=right>$stranswer: ";
echo "<TD $truecorrect>";
echo "<INPUT $truechecked TYPE=RADIO NAME=\"q$realquestion->id\" VALUE=\"$true->id\">$true->answer";
echo "</TD><TD $falsecorrect>";
echo "<INPUT $falsechecked TYPE=RADIO NAME=\"q$realquestion->id\" VALUE=\"$false->id\">$false->answer";
echo "</TD></TR></TABLE><BR CLEAR=ALL>";
if ($feedback) {
quiz_print_comment("<P ALIGN=right>$feedback[$feedbackid]</P>");
}
break;
case MULTICHOICE:
if (!$options = get_record("quiz_multichoice", "question", $question->id)) {
notify("Error: Missing question options!");
}
if (!$answers = get_records_list("quiz_answers", "id", $options->answers)) {
notify("Error: Missing question answers!");
}
echo text_to_html($question->questiontext);
if ($question->image) {
print_file_picture($question->image, $courseid);
}
echo "<TABLE ALIGN=right>";
echo "<TR><TD valign=top>$stranswer: </TD><TD>";
echo "<TABLE>";
$answerids = explode(",", $options->answers);
if ($shuffleanswers) {
$answerids = swapshuffle($answerids);
}
foreach ($answerids as $key => $answerid) {
$answer = $answers[$answerid];
$qnumchar = chr(ord('a') + $key);
if (empty($feedback) or empty($response[$answerid])) {
$checked = "";
} else {
$checked = "CHECKED";
}
echo "<TR><TD valign=top>";
if ($options->single) {
echo "<INPUT $checked TYPE=RADIO NAME=q$realquestion->id VALUE=\"$answer->id\">";
} else {
echo "<INPUT $checked TYPE=CHECKBOX NAME=q$realquestion->id"."a$answer->id VALUE=\"$answer->id\">";
}
echo "</TD>";
if (empty($feedback) or empty($correct[$answer->id])) {
echo "<TD valign=top>$qnumchar. $answer->answer</TD>";
} else {
echo "<TD valign=top CLASS=highlight>$qnumchar. $answer->answer</TD>";
}
if (!empty($feedback)) {
echo "<TD valign=top> ";
if (!empty($response[$answerid])) {
quiz_print_comment($feedback[$answerid]);
}
echo "</TD>";
}
echo "</TR>";
}
echo "</TABLE>";
echo "</TABLE>";
break;
case MATCH:
if (!$options = get_record("quiz_match", "question", $question->id)) {
notify("Error: Missing question options!");
}
if (!$subquestions = get_records_list("quiz_match_sub", "id", $options->subquestions)) {
notify("Error: Missing subquestions for this question!");
}
if (!empty($question->questiontext)) {
echo text_to_html($question->questiontext);
}
if (!empty($question->image)) {
print_file_picture($question->image, $courseid);
}
if ($shuffleanswers) {
$subquestions = draw_rand_array($subquestions, count($subquestions));
}
foreach ($subquestions as $subquestion) {
$answers[$subquestion->id] = $subquestion->answertext;
}
$answers = draw_rand_array($answers, count($answers));
echo "<table border=0 cellpadding=10 align=right>";
foreach ($subquestions as $key => $subquestion) {
echo "<tr><td align=left valign=top>";
echo $subquestion->questiontext;
echo "</td>";
if (empty($response)) {
echo "<td align=right valign=top>";
choose_from_menu($answers, "q$realquestion->id"."r$subquestion->id");
} else {
if (empty($response[$key])) {
echo "<td align=right valign=top>";
choose_from_menu($answers, "q$realquestion->id"."r$subquestion->id");
} else {
if ($response[$key] == $correct[$key]) {
echo "<td align=right valign=top class=highlight>";
choose_from_menu($answers, "q$realquestion->id"."r$subquestion->id", $response[$key]);
} else {
echo "<td align=right valign=top>";
choose_from_menu($answers, "q$realquestion->id"."r$subquestion->id", $response[$key]);
}
}
if (!empty($feedback[$key])) {
quiz_print_comment($feedback[$key]);
}
}
echo "</td></tr>";
}
echo "</table>";
break;
case RANDOMSAMATCH:
if (!$options = get_record("quiz_randomsamatch", "question", $question->id)) {
notify("Error: Missing question options!");
}
echo text_to_html($question->questiontext);
if ($question->image) {
print_file_picture($question->image, $courseid);
}
/// First, get all the questions available
$allquestions = get_records_select("quiz_questions",
"category = $question->category AND qtype = ".SHORTANSWER);
if (count($allquestions) < $options->choose) {
notify("Error: could not find enough Short Answer questions in the database!");
notify("Found ".count($allquestions).", need $options->choose.");
break;
}
if (empty($response)) { // Randomly pick the questions
if (!$randomquestions = draw_rand_array($allquestions, $options->choose)) {
notify("Error choosing $options->choose random questions");
break;
}
} else { // Use existing questions
$randomquestions = array();
foreach ($response as $key => $rrr) {
$rrr = explode("-", $rrr);
$randomquestions[$key] = $allquestions[$key];
$responseanswer[$key] = $rrr[1];
}
}
/// For each selected, find the best matching answers
foreach ($randomquestions as $randomquestion) {
$shortanswerquestion = get_record("quiz_shortanswer", "question", $randomquestion->id);
$questionanswers = get_records_list("quiz_answers", "id", $shortanswerquestion->answers);
$bestfraction = 0;
$bestanswer = NULL;
foreach ($questionanswers as $questionanswer) {
if ($questionanswer->fraction > $bestfraction) {
$bestanswer = $questionanswer;
}
}
if (empty($bestanswer)) {
notify("Error: Could not find the best answer for question: ".$randomquestions->name);
break;
}
$randomanswers[$bestanswer->id] = trim($bestanswer->answer);
}
if (!$randomanswers = draw_rand_array($randomanswers, $options->choose)) { // Mix them up
notify("Error randomising answers!");
break;
}
echo "<table border=0 cellpadding=10>";
foreach ($randomquestions as $key => $randomquestion) {
echo "<tr><td align=left valign=top>";
echo $randomquestion->questiontext;
echo "</td>";
echo "<td align=right valign=top>";
if (empty($response)) {
choose_from_menu($randomanswers, "q$realquestion->id"."r$randomquestion->id");
} else {
if (!empty($correct[$key])) {
if ($randomanswers[$responseanswer[$key]] == $correct[$key]) {
echo "<span=highlight>";
choose_from_menu($randomanswers, "q$realquestion->id"."r$randomquestion->id", $responseanswer[$key]);
echo "</span><br \>";
} else {
choose_from_menu($randomanswers, "q$realquestion->id"."r$randomquestion->id", $responseanswer[$key]);
quiz_print_correctanswer($correct[$key]);
}
} else {
choose_from_menu($randomanswers, "q$realquestion->id"."r$randomquestion->id", $responseanswer[$key]);
}
if (!empty($feedback[$key])) {
quiz_print_comment($feedback[$key]);
}
}
echo "</td></tr>";
}
echo "</table>";
break;
case RANDOM:
echo "<P>Random questions should not be printed this way!</P>";
break;
default:
notify("Error: Unknown question type!");
}
echo "</TD></TR></TABLE>";
}
function quiz_print_quiz_questions($quiz, $results=NULL, $questions=NULL, $shuffleorder=NULL) {
// Prints a whole quiz on one page.
/// Get the questions
if (!$questions) {
if (empty($quiz->questions)) {
notify("No questions have been defined!");
return false;
}
if (!$questions = get_records_list("quiz_questions", "id", $quiz->questions, "")) {
notify("Error when reading questions from the database!");
return false;
}
}
if (!$shuffleorder) {
if (!empty($quiz->shufflequestions)) { // Mix everything up
$questions = swapshuffle_assoc($questions);
} else {
$shuffleorder = explode(",", $quiz->questions); // Use originally defined order
}
}
if ($shuffleorder) { // Order has been defined, so reorder questions
$oldquestions = $questions;
$questions = array();
foreach ($shuffleorder as $key) {
$questions[] = $oldquestions[$key]; // This loses the index key, but doesn't matter
}
}
if (!$grades = get_records_list("quiz_question_grades", "question", $quiz->questions, "", "question,grade")) {
notify("No grades were found for these questions!");
return false;
}
/// Examine the set of questions for random questions, and retrieve them
if (empty($results)) { // Choose some new random questions
if ($randomcats = quiz_get_random_categories($quiz->questions)) {
foreach ($randomcats as $randomcat => $randomdraw) {
/// Get the appropriate amount of random questions from this category
if (!$catquestions[$randomcat] = quiz_choose_random_questions($randomcat, $randomdraw, $quiz->questions)) {
notify(get_string("toomanyrandom", "quiz", $randomcat));
return false;
}
}
}
} else { // Get the previously chosen questions
$chosen = array();
foreach ($questions as $question) {
if (isset($question->random)) {
$chosen[] = $question->random;
}
}
if ($chosen) {
$chosenlist = implode(",", $chosen);
if (!$chosen = get_records_list("quiz_questions", "id", $chosenlist, "")) {
notify("Error when reading questions from the database!");
return false;
}
}
}
$strconfirmattempt = addslashes(get_string("readytosend", "quiz"));
echo "<FORM METHOD=POST ACTION=attempt.php onsubmit=\"return confirm('$strconfirmattempt');\">";
echo "<INPUT TYPE=hidden NAME=q VALUE=\"$quiz->id\">";
$count = 0;
$questionorder = array();
foreach ($questions as $question) {
$count++;
$questionorder[] = $question->id;
$feedback = NULL;
$response = NULL;
$actualgrades = NULL;
$correct = NULL;
$randomquestion = NULL;
if (empty($results)) {
if ($question->qtype == RANDOM ) { // Set up random questions
$randomquestion = $question;
$question = array_pop($catquestions[$randomquestion->category]);
$grades[$question->id]->grade = $grades[$randomquestion->id]->grade;
}
} else {
if (!empty($results->feedback[$question->id])) {
$feedback = $results->feedback[$question->id];
}
if (!empty($results->response[$question->id])) {
$response = $results->response[$question->id];
}
if (!empty($results->grades[$question->id])) {
$actualgrades = $results->grades[$question->id];
}
if ($quiz->correctanswers) {
if (!empty($results->correct[$question->id])) {
$correct = $results->correct[$question->id];
}
}
if (!empty($question->random)) {
$randomquestion = $question;
$question = $chosen[$question->random];
$grades[$question->id]->grade = $grades[$randomquestion->id]->grade;
}
}
print_simple_box_start("CENTER", "90%");
quiz_print_question($count, $question, $grades[$question->id]->grade, $quiz->course,
$feedback, $response, $actualgrades, $correct,
$randomquestion, $quiz->shuffleanswers);
print_simple_box_end();
echo "<br \>";
}
if (empty($results)) {
if (!empty($quiz->shufflequestions)) { // Things have been mixed up, so pass the question order
$shuffleorder = implode(',', $questionorder);
echo "<input type=hidden name=shuffleorder value=\"$shuffleorder\">\n";
}
echo "<center><input type=submit value=\"".get_string("savemyanswers", "quiz")."\"></center>";
}
echo "</form>";
return true;
}
function quiz_get_default_category($courseid) {
/// Returns the current category
if ($categories = get_records("quiz_categories", "course", $courseid, "id")) {
foreach ($categories as $category) {
return $category; // Return the first one (lowest id)
}
}
// Otherwise, we need to make one
$category->name = get_string("default", "quiz");
$category->info = get_string("defaultinfo", "quiz");
$category->course = $courseid;
$category->publish = 0;
if (!$category->id = insert_record("quiz_categories", $category)) {
notify("Error creating a default category!");
return false;
}
return $category;
}
function quiz_get_category_menu($courseid, $published=false) {
/// Returns the list of categories
$publish = "";
if ($published) {
$publish = "OR publish = '1'";
}
return get_records_select_menu("quiz_categories", "course='$courseid' $publish", "name ASC", "id,name");
}
function quiz_print_category_form($course, $current) {
// Prints a form to choose categories
if (!$categories = get_records_select("quiz_categories", "course='$course->id' OR publish = '1'", "name ASC")) {
if (!$category = quiz_get_default_category($course->id)) {
notify("Error creating a default category!");
return false;
}
$categories[$category->id] = $category;
}
foreach ($categories as $key => $category) {
if ($category->publish) {
if ($catcourse = get_record("course", "id", $category->course)) {
$category->name .= " ($catcourse->shortname)";
}
}
$catmenu[$category->id] = $category->name;
}
$strcategory = get_string("category", "quiz");
$strshow = get_string("show", "quiz");
$streditcats = get_string("editcategories", "quiz");
echo "<TABLE width=\"100%\"><TR><TD NOWRAP>";
echo "<FORM METHOD=POST ACTION=edit.php>";
echo "<B>$strcategory:</B> ";
choose_from_menu($catmenu, "cat", "$current");
echo "<INPUT TYPE=submit VALUE=\"$strshow\">";
echo "</FORM>";
echo "</TD><TD align=right>";
echo "<FORM METHOD=GET ACTION=category.php>";
echo "<INPUT TYPE=hidden NAME=id VALUE=\"$course->id\">";
echo "<INPUT TYPE=submit VALUE=\"$streditcats\">";
echo "</FORM>";
echo "</TD></TR></TABLE>";
}
function quiz_choose_random_questions($category, $draws, $excluded=0) {
/// Given a question category and a number of draws, this function
/// creates a random subset of that size - returned as an array of questions
if (!$pool = get_records_select_menu("quiz_questions",
"category = '$category' AND id NOT IN ($excluded) AND qtype <> ".RANDOM, "", "id,qtype")) {
return false;
}
$countpool = count($pool);
if ($countpool == $draws) {
$chosen = $pool;
} else if ($countpool < $draws) {
return false;
} else {
$chosen = draw_rand_array($pool, $draws);
}
$chosenlist = implode(",", array_keys($chosen));
return get_records_list("quiz_questions", "id", $chosenlist);
}
function quiz_get_all_question_grades($questionlist, $quizid) {
// Given a list of question IDs, finds grades or invents them to
// create an array of matching grades
if (empty($questionlist)) {
return array();
}
$questions = quiz_get_question_grades($quizid, $questionlist);
$list = explode(",", $questionlist);
$grades = array();
foreach ($list as $qid) {
if (isset($questions[$qid])) {
$grades[$qid] = $questions[$qid]->grade;
} else {
$grades[$qid] = 1;
}
}
return $grades;
}
function quiz_print_question_list($questionlist, $grades) {
// Prints a list of quiz questions in a small layout form with knobs
// $questionlist is comma-separated list
// $grades is an array of corresponding grades
global $THEME;
if (!$questionlist) {
echo "<P align=center>";
print_string("noquestions", "quiz");
echo "</P>";
return;
}
$order = explode(",", $questionlist);
if (!$questions = get_records_list("quiz_questions", "id", $questionlist)) {
echo "<P align=center>";
print_string("noquestions", "quiz");
echo "</P>";
return;
}
$strorder = get_string("order");
$strquestionname = get_string("questionname", "quiz");
$strgrade = get_string("grade");
$strdelete = get_string("delete");
$stredit = get_string("edit");
$strmoveup = get_string("moveup");
$strmovedown = get_string("movedown");
$strsavegrades = get_string("savegrades", "quiz");
$strtype = get_string("type", "quiz");
for ($i=10; $i>=0; $i--) {
$gradesmenu[$i] = $i;
}
$count = 0;
$sumgrade = 0;
$total = count($order);
echo "<FORM METHOD=post ACTION=edit.php>";
echo "<TABLE BORDER=0 CELLPADDING=5 CELLSPACING=2 WIDTH=\"100%\">";