questions);
// only do something if this question exists
if (!isset($questions[$id])) {
return false;
}
$question = $questions[$id];
unset($questions[$id]);
// If we deleted the question at the top and it was followed by
// a page break then delete page break as well
if ($id == 0 && count($questions) > 1 && $questions[1] == 0) {
unset($questions[1]);
}
$quiz->questions = implode(",", $questions);
// Avoid duplicate page breaks
$quiz->questions = str_replace(',0,0', ',0', $quiz->questions);
// save new questionlist in database
if (!set_field('quiz', 'questions', $quiz->questions, 'id', $quiz->instance)) {
error('Could not save question list');
}
delete_records('quiz_question_instances', 'quiz', $quiz->instance, 'question', $question);
return true;
}
/**
* Add a question to a quiz
*
* Adds a question to a quiz by updating $quiz as well as the
* quiz and quiz_question_instances tables. It also adds a page break
* if required.
* @return boolean false if the question was already in the quiz
* @param int $id The id of the question to be added
* @param object $quiz The extended quiz object as used by edit.php
* This is updated by this function
*/
function quiz_add_quiz_question($id, &$quiz) {
$questions = explode(",", $quiz->questions);
if (in_array($id, $questions)) {
return false;
}
// remove ending page break if it is not needed
if ($breaks = array_keys($questions, 0)) {
// determine location of the last two page breaks
$end = end($breaks);
$last = prev($breaks);
$last = $last ? $last : -1;
if (!$quiz->questionsperpage or (($end - $last -1) < $quiz->questionsperpage)) {
array_pop($questions);
}
}
// add question
$questions[] = $id;
// add ending page break
$questions[] = 0;
// Save new questionslist in database
$quiz->questions = implode(",", $questions);
if (!set_field('quiz', 'questions', $quiz->questions, 'id', $quiz->id)) {
error('Could not save question list');
}
// update question grades
$questionrecord = get_record("question", "id", $id);
$quiz->grades[$id]
= $questionrecord->defaultgrade;
quiz_update_question_instance($quiz->grades[$id], $id, $quiz->instance);
return true;
}
/**
* Save changes to question instance
*
* Saves changes to the question grades in the quiz_question_instances table.
* It does not update 'sumgrades' in the quiz table.
* @return boolean Indicates success or failure.
* @param integer grade The maximal grade for the question
* @param integer $questionid The id of the question
* @param integer $quizid The id of the quiz to update / add the instances for.
*/
function quiz_update_question_instance($grade, $questionid, $quizid) {
if ($instance = get_record("quiz_question_instances", "quiz", $quizid, 'question', $questionid)) {
$instance->grade = $grade;
return update_record('quiz_question_instances', $instance);
} else {
unset($instance);
$instance->quiz = $quizid;
$instance->question = $questionid;
$instance->grade = $grade;
return insert_record("quiz_question_instances", $instance);
}
}
/**
* Prints a list of quiz questions in a small layout form with knobs
*
* @return int sum of maximum grades
* @param object $quiz This is not the standard quiz object used elsewhere but
* it contains the quiz layout in $quiz->questions and the grades in
* $quiz->grades
* @param boolean $allowdelete Indicates whether the delete icons should be displayed
* @param boolean $showbreaks Indicates whether the page breaks should be displayed
* @param boolean $showbreaks Indicates whether the reorder tool should be displayed
*/
function quiz_print_question_list($quiz, $pageurl, $allowdelete=true, $showbreaks=true, $reordertool=false) {
global $USER, $CFG, $QTYPES;
$strorder = get_string("order");
$strquestionname = get_string("questionname", "quiz");
$strgrade = get_string("grade");
$strremove = get_string('remove', 'quiz');
$stredit = get_string("edit");
$strview = get_string("view");
$straction = get_string("action");
$strmoveup = get_string("moveup");
$strmovedown = get_string("movedown");
$strsavegrades = get_string("savegrades", "quiz");
$strtype = get_string("type", "quiz");
$strpreview = get_string("preview", "quiz");
if (!$quiz->questions) {
echo "
";
print_string("noquestions", "quiz");
echo "
";
return 0;
}
if (!$questions = get_records_sql("SELECT q.*,c.contextid
FROM {$CFG->prefix}question q,
{$CFG->prefix}question_categories c
WHERE q.id in ($quiz->questions)
AND q.category = c.id")) {
echo "
";
print_string("noquestions", "quiz");
echo "
";
return 0;
}
$count = 0;
$qno = 1;
$sumgrade = 0;
$order = explode(',', $quiz->questions);
$lastindex = count($order)-1;
// If the list does not end with a pagebreak then add it on.
if ($order[$lastindex] != 0) {
$order[] = 0;
$lastindex++;
}
echo "\n";
/// Form to choose to show pagebreaks and to repaginate quiz
echo '';
return $sumgrade;
}
?>