watu / models / question.php

question.php in Watu Quiz trunk, at models/question.php

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1	<?php
2	if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly
3
4	class WatuQuestion {
5	// calculate points, correctness and return the class
6	static function calculate($question, $ans, $ansArr, $correct, $class) {
7	$points = 0;
8
9	if($question->answer_type != 'textarea') {
10	if($ans->correct == 1 and !$question->is_survey) $class .= ' correct-answer';
11	if( in_array($ans->ID , $ansArr) ) $class .= ' user-answer';
12	if( in_array($ans->ID , $ansArr ) and $ans->correct == 1 and !$question->is_survey) $correct = true;
13	if( in_array($ans->ID , $ansArr ) ) $points = $ans->point;
14	}
15	else {
16	// textareas
17	$user_answer = $ansArr[0];
18
19	if( strtolower(trim($ans->answer)) == strtolower(trim($user_answer)) ) {
20	$class .= ' user-answer';
21	$points = $ans->point;
22	}
23	if( strtolower(trim($ans->answer)) == strtolower(trim($user_answer)) and $ans->correct == 1 and !$question->is_survey) {
24	$correct = true;
25	$class .= ' correct-answer';
26	}
27	} // end working with textareas
28
29	if($question->is_survey) $class = str_replace('user-answer', 'user-answer-survey', $class);
30
31	return array($points, $correct, $class);
32	}
33
34	// figure out the maximum number of points the user can get on the question
35	static function max_points($question, $all_answers) {
36	$max_points = 0;
37
38	// get only the answers of this question
39	$q_answers = array();
40	foreach($all_answers as $answer) {
41	if($answer->question_id == $question->ID) $q_answers[] = $answer;
42	}
43
44	if(!count($q_answers)) return 0;
45
46	switch($question->answer_type) {
47	case 'radio':
48	case 'textarea':
49	// get the answer with most points
50	$max = 0;
51	foreach($q_answers as $answer) {
52	if($answer->point > $max) $max = $answer->point;
53	}
54
55	$max_points += $max;
56	break;
57
58	case 'checkbox':
59	foreach($q_answers as $answer) {
60	if($answer->point > 0) $max_points += $answer->point;
61	}
62	break;
63	}
64
65	return $max_points;
66	} // end max_points
67
68	// backward compatibility. In old versions sort order was not given
69	// so we'll make sure all questions have correct one when loading the page
70	static function fix_sort_order($questions) {
71	global $wpdb;
72	$ct = empty($questions[0]->sort_order) ? 0 : intval($questions[0]->sort_order); // get the sort order of the first question on the page. If empty for some reason, it will become 1 in the loop
73	foreach($questions as $cnt => $question) {
74	$ct++;
75	if(@$question->sort_order != $ct) {
76	$wpdb->query("UPDATE ".WATU_QUESTIONS." SET sort_order=$ct WHERE ID={$question->ID}");
77	}
78	}
79	}
80
81	static function reorder($id, $exam_id, $dir) {
82	global $wpdb;
83	$id = intval($id);
84	$exam_id = intval($exam_id);
85
86	// select question
87	$question=$wpdb->get_row($wpdb->prepare("SELECT * FROM ".WATU_QUESTIONS." WHERE ID=%d", $id));
88
89	if($dir=="up") {
90	$new_order = $question->sort_order-1;
91	if($new_order<0) $new_order=0;
92
93	// shift others
94	$wpdb->query($wpdb->prepare("UPDATE ".WATU_QUESTIONS." SET sort_order=sort_order+1
95	WHERE ID!=%d AND sort_order=%d AND exam_id=%d", $id, $new_order, $exam_id));
96	}
97
98	if($dir=="down") {
99	$new_order = $question->sort_order+1;
100
101	// shift others
102	$wpdb->query($wpdb->prepare("UPDATE ".WATU_QUESTIONS." SET sort_order=sort_order-1
103	WHERE ID!=%d AND sort_order=%d AND exam_id=%d", $id, $new_order, $exam_id));
104	}
105
106	// change this one
107	$wpdb->query($wpdb->prepare("UPDATE ".WATU_QUESTIONS." SET sort_order=%d WHERE ID=%d",
108	$new_order, $id));
109	}
110	}