mirrored from git://git.moodle.org/moodle.git
/
lib.php
1648 lines (1444 loc) · 59.2 KB
/
lib.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Library of functions for the quiz module.
*
* This contains functions that are called also from outside the quiz module
* Functions that are only called by the quiz module itself are in {@link locallib.php}
*
* @package mod
* @subpackage quiz
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
/** Require {@link eventslib.php} */
require_once($CFG->libdir . '/eventslib.php');
/** Require {@link calendar/lib.php} */
require_once($CFG->dirroot . '/calendar/lib.php');
/**#@+
* Option controlling what options are offered on the quiz settings form.
*/
define('QUIZ_MAX_ATTEMPT_OPTION', 10);
define('QUIZ_MAX_QPP_OPTION', 50);
define('QUIZ_MAX_DECIMAL_OPTION', 5);
define('QUIZ_MAX_Q_DECIMAL_OPTION', 7);
/**#@-*/
/**
* If start and end date for the quiz are more than this many seconds apart
* they will be represented by two separate events in the calendar
*/
define('QUIZ_MAX_EVENT_LENGTH', 5*24*60*60); // 5 days
/// FUNCTIONS ///////////////////////////////////////////////////////////////////
/**
* Given an object containing all the necessary data,
* (defined by the form in mod_form.php) this function
* will create a new instance and return the id number
* of the new instance.
*
* @param object $quiz the data that came from the form.
* @return mixed the id of the new instance on success,
* false or a string error message on failure.
*/
function quiz_add_instance($quiz) {
global $DB;
$cmid = $quiz->coursemodule;
// Process the options from the form.
$quiz->created = time();
$quiz->questions = '';
$result = quiz_process_options($quiz);
if ($result && is_string($result)) {
return $result;
}
// Try to store it in the database.
$quiz->id = $DB->insert_record('quiz', $quiz);
// Do the processing required after an add or an update.
quiz_after_add_or_update($quiz);
return $quiz->id;
}
/**
* Given an object containing all the necessary data,
* (defined by the form in mod_form.php) this function
* will update an existing instance with new data.
*
* @param object $quiz the data that came from the form.
* @return mixed true on success, false or a string error message on failure.
*/
function quiz_update_instance($quiz, $mform) {
global $CFG, $DB;
// Process the options from the form.
$result = quiz_process_options($quiz);
if ($result && is_string($result)) {
return $result;
}
$oldquiz = $DB->get_record('quiz', array('id' => $quiz->instance));
// Repaginate, if asked to.
if (!$quiz->shufflequestions && !empty($quiz->repaginatenow)) {
require_once($CFG->dirroot . '/mod/quiz/locallib.php');
$quiz->questions = quiz_repaginate($oldquiz->questions, $quiz->questionsperpage);
}
unset($quiz->repaginatenow);
// Update the database.
$quiz->id = $quiz->instance;
$DB->update_record('quiz', $quiz);
// Do the processing required after an add or an update.
quiz_after_add_or_update($quiz);
if ($oldquiz->grademethod != $quiz->grademethod) {
require_once($CFG->dirroot . '/mod/quiz/locallib.php');
$quiz->sumgrades = $oldquiz->sumgrades;
$quiz->grade = $oldquiz->grade;
quiz_update_all_final_grades($quiz);
quiz_update_grades($quiz);
}
// Delete any previous preview attempts
quiz_delete_previews($quiz);
return true;
}
/**
* Given an ID of an instance of this module,
* this function will permanently delete the instance
* and any data that depends on it.
*
* @param int $id the id of the quiz to delete.
* @return boolean success or failure.
*/
function quiz_delete_instance($id) {
global $DB;
$quiz = $DB->get_record('quiz', array('id' => $id), '*', MUST_EXIST);
quiz_delete_all_attempts($quiz);
quiz_delete_all_overrides($quiz);
$DB->delete_records('quiz_question_instances', array('quiz' => $quiz->id));
$DB->delete_records('quiz_feedback', array('quizid' => $quiz->id));
$events = $DB->get_records('event', array('modulename' => 'quiz', 'instance' => $quiz->id));
foreach($events as $event) {
$event = calendar_event::load($event);
$event->delete();
}
quiz_grade_item_delete($quiz);
$DB->delete_records('quiz', array('id' => $quiz->id));
return true;
}
/**
* Deletes a quiz override from the database and clears any corresponding calendar events
*
* @param object $quiz The quiz object.
* @param integer $overrideid The id of the override being deleted
* @return bool true on success
*/
function quiz_delete_override($quiz, $overrideid) {
global $DB;
$override = $DB->get_record('quiz_overrides', array('id' => $overrideid), '*', MUST_EXIST);
// Delete the events
$events = $DB->get_records('event', array('modulename' => 'quiz',
'instance' => $quiz->id, 'groupid' => (int)$override->groupid,
'userid' => (int)$override->userid));
foreach ($events as $event) {
$eventold = calendar_event::load($event);
$eventold->delete();
}
$DB->delete_records('quiz_overrides', array('id' => $overrideid));
return true;
}
/**
* Deletes all quiz overrides from the database and clears any corresponding calendar events
*
* @param object $quiz The quiz object.
*/
function quiz_delete_all_overrides($quiz) {
global $DB;
$overrides = $DB->get_records('quiz_overrides', array('quiz' => $quiz->id), 'id');
foreach ($overrides as $override) {
quiz_delete_override($quiz, $override->id);
}
}
/**
* Updates a quiz object with override information for a user.
*
* Algorithm: For each quiz setting, if there is a matching user-specific override,
* then use that otherwise, if there are group-specific overrides, return the most
* lenient combination of them. If neither applies, leave the quiz setting unchanged.
*
* Special case: if there is more than one password that applies to the user, then
* quiz->extrapasswords will contain an array of strings giving the remaining
* passwords.
*
* @param object $quiz The quiz object.
* @param integer $userid The userid.
* @return object $quiz The updated quiz object.
*/
function quiz_update_effective_access($quiz, $userid) {
global $DB;
// check for user override
$override = $DB->get_record('quiz_overrides', array('quiz' => $quiz->id, 'userid' => $userid));
if (!$override) {
$override = new stdClass();
$override->timeopen = null;
$override->timeclose = null;
$override->timelimit = null;
$override->attempts = null;
$override->password = null;
}
// check for group overrides
$groupings = groups_get_user_groups($quiz->course, $userid);
if (!empty($groupings[0])) {
// Select all overrides that apply to the User's groups
list($extra, $params) = $DB->get_in_or_equal(array_values($groupings[0]));
$sql = "SELECT * FROM {quiz_overrides}
WHERE groupid $extra AND quiz = ?";
$params[] = $quiz->id;
$records = $DB->get_records_sql($sql, $params);
// Combine the overrides
$opens = array();
$closes = array();
$limits = array();
$attempts = array();
$passwords = array();
foreach ($records as $gpoverride) {
if (isset($gpoverride->timeopen)) {
$opens[] = $gpoverride->timeopen;
}
if (isset($gpoverride->timeclose)) {
$closes[] = $gpoverride->timeclose;
}
if (isset($gpoverride->timelimit)) {
$limits[] = $gpoverride->timelimit;
}
if (isset($gpoverride->attempts)) {
$attempts[] = $gpoverride->attempts;
}
if (isset($gpoverride->password)) {
$passwords[] = $gpoverride->password;
}
}
// If there is a user override for a setting, ignore the group override
if (is_null($override->timeopen) && count($opens)) {
$override->timeopen = min($opens);
}
if (is_null($override->timeclose) && count($closes)) {
$override->timeclose = max($closes);
}
if (is_null($override->timelimit) && count($limits)) {
$override->timelimit = max($limits);
}
if (is_null($override->attempts) && count($attempts)) {
$override->attempts = max($attempts);
}
if (is_null($override->password) && count($passwords)) {
$override->password = array_shift($passwords);
if (count($passwords)) {
$override->extrapasswords = $passwords;
}
}
}
// merge with quiz defaults
$keys = array('timeopen', 'timeclose', 'timelimit', 'attempts', 'password', 'extrapasswords');
foreach ($keys as $key) {
if (isset($override->{$key})) {
$quiz->{$key} = $override->{$key};
}
}
return $quiz;
}
/**
* Delete all the attempts belonging to a quiz.
*
* @global stdClass
* @global object
* @param object $quiz The quiz object.
*/
function quiz_delete_all_attempts($quiz) {
global $CFG, $DB;
require_once($CFG->libdir . '/questionlib.php');
// TODO remove $CFG->prefix
question_engine::delete_questions_usage_by_activities("{$CFG->prefix}question_usages.id IN (
SELECT uniqueid FROM {$CFG->prefix}quiz_attempts WHERE quiz = $quizid)");
$DB->delete_records('quiz_attempts', array('quiz' => $quiz->id));
$DB->delete_records('quiz_grades', array('quiz' => $quiz->id));
}
/**
* Get the best current grade for a particular user in a quiz.
*
* @param object $quiz the quiz settings.
* @param integer $userid the id of the user.
* @return float the user's current grade for this quiz, or NULL if this user does
* not have a grade on this quiz.
*/
function quiz_get_best_grade($quiz, $userid) {
global $DB;
$grade = $DB->get_field('quiz_grades', 'grade', array('quiz' => $quiz->id, 'userid' => $userid));
// Need to detect errors/no result, without catching 0 grades.
if ($grade === false) {
return null;
}
return $grade + 0; // Convert to number.
}
/**
* Is this a graded quiz? If this method returns true, you can assume that
* $quiz->grade and $quiz->sumgrades are non-zero (for example, if you want to
* divide by them).
*
* @param object $quiz a row from the quiz table.
* @return boolean whether this is a graded quiz.
*/
function quiz_has_grades($quiz) {
return $quiz->grade >= 0.000005 && $quiz->sumgrades >= 0.000005;
}
/**
* 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
*
* @param object $course
* @param object $user
* @param object $mod
* @param object $quiz
* @return object|null
*/
function quiz_user_outline($course, $user, $mod, $quiz) {
global $DB, $CFG;
require_once("$CFG->libdir/gradelib.php");
$grades = grade_get_grades($course->id, 'mod', 'quiz', $quiz->id, $user->id);
if (empty($grades->items[0]->grades)) {
return null;
} else {
$grade = reset($grades->items[0]->grades);
}
$result = new stdClass;
$result->info = get_string('grade') . ': ' . $grade->str_long_grade;
$result->time = $grade->dategraded;
return $result;
}
/**
* Print a detailed representation of what a user has done with
* a given particular instance of this module, for user activity reports.
*
* @global object
* @param object $course
* @param object $user
* @param object $mod
* @param object $quiz
* @return bool
*/
function quiz_user_complete($course, $user, $mod, $quiz) {
global $DB, $CFG, $OUTPUT;
require_once("$CFG->libdir/gradelib.php");
$grades = grade_get_grades($course->id, 'mod', 'quiz', $quiz->id, $user->id);
if (!empty($grades->items[0]->grades)) {
$grade = reset($grades->items[0]->grades);
echo $OUTPUT->container(get_string('grade').': '.$grade->str_long_grade);
if ($grade->str_feedback) {
echo $OUTPUT->container(get_string('feedback').': '.$grade->str_feedback);
}
}
if ($attempts = $DB->get_records('quiz_attempts', array('userid' => $user->id, 'quiz' => $quiz->id), 'attempt')) {
foreach ($attempts as $attempt) {
echo get_string('attempt', 'quiz').' '.$attempt->attempt.': ';
if ($attempt->timefinish == 0) {
print_string('unfinished');
} else {
echo quiz_format_grade($quiz, $attempt->sumgrades) . '/' . quiz_format_grade($quiz, $quiz->sumgrades);
}
echo ' - '.userdate($attempt->timemodified).'<br />';
}
} else {
print_string('noattempts', 'quiz');
}
return true;
}
/**
* 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 ...
*
* @return bool true
*/
function quiz_cron() {
return true;
}
/**
* @param integer $quizid the quiz id.
* @param integer $userid the userid.
* @param string $status 'all', 'finished' or 'unfinished' to control
* @param bool $includepreviews
* @return an array of all the user's attempts at this quiz. Returns an empty array if there are none.
*/
function quiz_get_user_attempts($quizid, $userid, $status = 'finished', $includepreviews = false) {
global $DB;
$status_condition = array(
'all' => '',
'finished' => ' AND timefinish > 0',
'unfinished' => ' AND timefinish = 0'
);
$previewclause = '';
if (!$includepreviews) {
$previewclause = ' AND preview = 0';
}
return $DB->get_records_select('quiz_attempts',
'quiz = ? AND userid = ?' . $previewclause . $status_condition[$status],
array($quizid, $userid), 'attempt ASC');
}
/**
* Return grade for given user or all users.
*
* @param int $quizid id of quiz
* @param int $userid optional user id, 0 means all users
* @return array array of grades, false if none. These are raw grades. They should
* be processed with quiz_format_grade for display.
*/
function quiz_get_user_grades($quiz, $userid = 0) {
global $CFG, $DB;
$params = array($quiz->id);
$usertest = '';
if ($userid) {
$params[] = $userid;
$usertest = 'AND u.id = ?';
}
return $DB->get_records_sql("
SELECT
u.id,
u.id AS userid,
qg.grade AS rawgrade,
qg.timemodified AS dategraded,
MAX(qa.timefinish) AS datesubmitted
FROM {user} u
JOIN {quiz_grades} qg ON u.id = qg.userid
JOIN {quiz_attempts} qa ON qa.quiz = qg.quiz AND qa.userid = u.id
WHERE qg.quiz = ?
$usertest
GROUP BY u.id, qg.grade, qg.timemodified", $params);
}
/**
* Round a grade to to the correct number of decimal places, and format it for display.
*
* @param object $quiz The quiz table row, only $quiz->decimalpoints is used.
* @param float $grade The grade to round.
* @return float
*/
function quiz_format_grade($quiz, $grade) {
if (is_null($grade)) {
return get_string('notyetgraded', 'quiz');
}
return format_float($grade, $quiz->decimalpoints);
}
/**
* Round a grade to to the correct number of decimal places, and format it for display.
*
* @param object $quiz The quiz table row, only $quiz->decimalpoints is used.
* @param float $grade The grade to round.
* @return float
*/
function quiz_format_question_grade($quiz, $grade) {
if (empty($quiz->questiondecimalpoints)) {
$quiz->questiondecimalpoints = -1;
}
if ($quiz->questiondecimalpoints == -1) {
return format_float($grade, $quiz->decimalpoints);
} else {
return format_float($grade, $quiz->questiondecimalpoints);
}
}
/**
* Update grades in central gradebook
*
* @param object $quiz the quiz settings.
* @param int $userid specific user only, 0 means all users.
*/
function quiz_update_grades($quiz, $userid = 0, $nullifnone = true) {
global $CFG, $DB;
require_once($CFG->libdir.'/gradelib.php');
if ($quiz->grade == 0) {
quiz_grade_item_update($quiz);
} else if ($grades = quiz_get_user_grades($quiz, $userid)) {
quiz_grade_item_update($quiz, $grades);
} else if ($userid && $nullifnone) {
$grade = new stdClass();
$grade->userid = $userid;
$grade->rawgrade = null;
quiz_grade_item_update($quiz, $grade);
} else {
quiz_grade_item_update($quiz);
}
}
/**
* Update all grades in gradebook.
*/
function quiz_upgrade_grades() {
global $DB;
$sql = "SELECT COUNT('x')
FROM {quiz} a, {course_modules} cm, {modules} m
WHERE m.name='quiz' AND m.id=cm.module AND cm.instance=a.id";
$count = $DB->count_records_sql($sql);
$sql = "SELECT a.*, cm.idnumber AS cmidnumber, a.course AS courseid
FROM {quiz} a, {course_modules} cm, {modules} m
WHERE m.name='quiz' AND m.id=cm.module AND cm.instance=a.id";
$rs = $DB->get_recordset_sql($sql);
if ($rs->valid()) {
$pbar = new progress_bar('quizupgradegrades', 500, true);
$i=0;
foreach ($rs as $quiz) {
$i++;
upgrade_set_timeout(60*5); // set up timeout, may also abort execution
quiz_update_grades($quiz, 0, false);
$pbar->update($i, $count, "Updating Quiz grades ($i/$count).");
}
}
$rs->close();
}
/**
* Create grade item for given quiz
*
* @param object $quiz object with extra cmidnumber
* @param mixed $grades optional array/object of grade(s); 'reset' means reset grades in gradebook
* @return int 0 if ok, error code otherwise
*/
function quiz_grade_item_update($quiz, $grades = NULL) {
global $CFG, $OUTPUT;
require_once($CFG->libdir.'/gradelib.php');
if (array_key_exists('cmidnumber', $quiz)) { // may not be always present
$params = array('itemname' => $quiz->name, 'idnumber' => $quiz->cmidnumber);
} else {
$params = array('itemname' => $quiz->name);
}
if ($quiz->grade > 0) {
$params['gradetype'] = GRADE_TYPE_VALUE;
$params['grademax'] = $quiz->grade;
$params['grademin'] = 0;
} else {
$params['gradetype'] = GRADE_TYPE_NONE;
}
/* description by TJ:
1/ If the quiz is set to not show grades while the quiz is still open, and is set to show grades after
the quiz is closed, then create the grade_item with a show-after date that is the quiz close date.
2/ If the quiz is set to not show grades at either of those times, create the grade_item as hidden.
3/ If the quiz is set to show grades, create the grade_item visible.
*/
$openreviewoptions = mod_quiz_display_options::make_from_quiz($quiz,
mod_quiz_display_options::LATER_WHILE_OPEN);
$closedreviewoptions = mod_quiz_display_options::make_from_quiz($quiz,
mod_quiz_display_options::AFTER_CLOSE);
if (!$openreviewoptions->marks && !$closedreviewoptions->marks) {
$params['hidden'] = 1;
} else if (!$openreviewoptions->marks && $closedreviewoptions->marks) {
if ($quiz->timeclose) {
$params['hidden'] = $quiz->timeclose;
} else {
$params['hidden'] = 1;
}
} else {
// a) both open and closed enabled
// b) open enabled, closed disabled - we can not "hide after", grades are kept visible even after closing
$params['hidden'] = 0;
}
if ($grades === 'reset') {
$params['reset'] = true;
$grades = NULL;
}
$gradebook_grades = grade_get_grades($quiz->course, 'mod', 'quiz', $quiz->id);
if (!empty($gradebook_grades->items)) {
$grade_item = $gradebook_grades->items[0];
if ($grade_item->locked) {
$confirm_regrade = optional_param('confirm_regrade', 0, PARAM_INT);
if (!$confirm_regrade) {
$message = get_string('gradeitemislocked', 'grades');
$back_link = $CFG->wwwroot . '/mod/quiz/report.php?q=' . $quiz->id . '&mode=overview';
$regrade_link = qualified_me() . '&confirm_regrade=1';
echo $OUTPUT->box_start('generalbox', 'notice');
echo '<p>'. $message .'</p>';
echo $OUTPUT->container_start('buttons');
echo $OUTPUT->single_button($regrade_link, get_string('regradeanyway', 'grades'));
echo $OUTPUT->single_button($back_link, get_string('cancel'));
echo $OUTPUT->container_end();
echo $OUTPUT->box_end();
return GRADE_UPDATE_ITEM_LOCKED;
}
}
}
return grade_update('mod/quiz', $quiz->course, 'mod', 'quiz', $quiz->id, 0, $grades, $params);
}
/**
* Delete grade item for given quiz
*
* @param object $quiz object
* @return object quiz
*/
function quiz_grade_item_delete($quiz) {
global $CFG;
require_once($CFG->libdir . '/gradelib.php');
return grade_update('mod/quiz', $quiz->course, 'mod', 'quiz', $quiz->id, 0, NULL, array('deleted' => 1));
}
/**
* Returns an array of users who have data in a given quiz
*
* @param int $quizid the quiz id.
* @return array of userids.
*/
function quiz_get_participants($quizid) {
global $CFG, $DB;
return $DB->get_records_sql('
SELECT DISTINCT userid, userid
JOIN {quiz_attempts} qa
WHERE a.quiz = ?', array($quizid));
}
/**
* This standard function will check all instances of this module
* and make sure there are up-to-date events created for each of them.
* If courseid = 0, then every quiz event in the site is checked, else
* only quiz events belonging to the course specified are checked.
* This function is used, in its new format, by restore_refresh_events()
*
* @param int $courseid
* @return bool
*/
function quiz_refresh_events($courseid = 0) {
global $DB;
if ($courseid == 0) {
if (!$quizzes = $DB->get_records('quiz')) {
return true;
}
} else {
if (!$quizzes = $DB->get_records('quiz', array('course' => $courseid))) {
return true;
}
}
foreach ($quizzes as $quiz) {
quiz_update_events($quiz);
}
return true;
}
/**
* Returns all quiz graded users since a given time for specified quiz
*/
function quiz_get_recent_mod_activity(&$activities, &$index, $timestart,
$courseid, $cmid, $userid = 0, $groupid = 0) {
global $CFG, $COURSE, $USER, $DB;
require_once('locallib.php');
if ($COURSE->id == $courseid) {
$course = $COURSE;
} else {
$course = $DB->get_record('course', array('id' => $courseid));
}
$modinfo =& get_fast_modinfo($course);
$cm = $modinfo->cms[$cmid];
$quiz = $DB->get_record('quiz', array('id' => $cm->instance));
if ($userid) {
$userselect = "AND u.id = :userid";
$params['userid'] = $userid;
} else {
$userselect = '';
}
if ($groupid) {
$groupselect = 'AND gm.groupid = :groupid';
$groupjoin = 'JOIN {groups_members} gm ON gm.userid=u.id';
$params['groupid'] = $groupid;
} else {
$groupselect = '';
$groupjoin = '';
}
$params['timestart'] = $timestart;
$params['quizid'] = $quiz->id;
if (!$attempts = $DB->get_records_sql("
SELECT qa.*,
u.firstname, u.lastname, u.email, u.picture, u.imagealt
FROM {quiz_attempts} qa
JOIN {user} u ON u.id = qa.userid
$groupjoin
WHERE qa.timefinish > :timestart
AND qa.quiz = :quizid
AND qa.preview = 0
$userselect
$groupselect
ORDER BY qa.timefinish ASC", $params)) {
return;
}
$context = get_context_instance(CONTEXT_MODULE, $cm->id);
$accessallgroups = has_capability('moodle/site:accessallgroups', $context);
$viewfullnames = has_capability('moodle/site:viewfullnames', $context);
$grader = has_capability('mod/quiz:viewreports', $context);
$groupmode = groups_get_activity_groupmode($cm, $course);
if (is_null($modinfo->groups)) {
$modinfo->groups = groups_get_user_groups($course->id); // load all my groups and cache it in modinfo
}
$usersgroups = null;
$aname = format_string($cm->name,true);
foreach ($attempts as $attempt) {
if ($attempt->userid != $USER->id) {
if (!$grader) {
// Grade permission required
continue;
}
if ($groupmode == SEPARATEGROUPS and !$accessallgroups) {
if (is_null($usersgroups)) {
$usersgroups = groups_get_all_groups($course->id,
$attempt->userid, $cm->groupingid);
if (is_array($usersgroups)) {
$usersgroups = array_keys($usersgroups);
} else {
$usersgroups = array();
}
}
if (!array_intersect($usersgroups, $modinfo->groups[$cm->id])) {
continue;
}
}
}
$options = quiz_get_reviewoptions($quiz, $attempt, $context);
$tmpactivity = new stdClass;
$tmpactivity->type = 'quiz';
$tmpactivity->cmid = $cm->id;
$tmpactivity->name = $aname;
$tmpactivity->sectionnum = $cm->sectionnum;
$tmpactivity->timestamp = $attempt->timefinish;
$tmpactivity->content->attemptid = $attempt->id;
$tmpactivity->content->attempt = $attempt->attempt;
if (quiz_has_grades($quiz) && $options->marks) {
$tmpactivity->content->sumgrades = quiz_format_grade($quiz, $attempt->sumgrades);
$tmpactivity->content->maxgrade = quiz_format_grade($quiz, $quiz->sumgrades);
} else {
$tmpactivity->content->sumgrades = null;
$tmpactivity->content->maxgrade = null;
}
$tmpactivity->user->id = $attempt->userid;
$tmpactivity->user->firstname = $attempt->firstname;
$tmpactivity->user->lastname = $attempt->lastname;
$tmpactivity->user->fullname = fullname($attempt, $viewfullnames);
$tmpactivity->user->picture = $attempt->picture;
$tmpactivity->user->imagealt = $attempt->imagealt;
$tmpactivity->user->email = $attempt->email;
$activities[$index++] = $tmpactivity;
}
}
function quiz_print_recent_mod_activity($activity, $courseid, $detail, $modnames) {
global $CFG, $OUTPUT;
echo '<table border="0" cellpadding="3" cellspacing="0" class="forum-recent">';
echo '<tr><td class="userpicture" valign="top">';
echo $OUTPUT->user_picture($activity->user, array('courseid' => $courseid));
echo '</td><td>';
if ($detail) {
$modname = $modnames[$activity->type];
echo '<div class="title">';
echo '<img src="' . $OUTPUT->pix_url('icon', $activity->type) . '" ' .
'class="icon" alt="' . $modname . '" />';
echo '<a href="' . $CFG->wwwroot . '/mod/quiz/view.php?id=' .
$activity->cmid . '">' . $activity->name . '</a>';
echo '</div>';
}
echo '<div class="grade">';
echo get_string('attempt', 'quiz', $activity->content->attempt);
if (isset($activity->content->maxgrade)) {
$grades = $activity->content->sumgrades . ' / ' . $activity->content->maxgrade;
echo ': (<a href="' . $CFG->wwwroot . '/mod/quiz/review.php?attempt=' .
$activity->content->attemptid . '">' . $grades . '</a>)';
}
echo '</div>';
echo '<div class="user">';
echo '<a href="' . $CFG->wwwroot . '/user/view.php?id=' . $activity->user->id .
'&course=' . $courseid . '">' . $activity->user->fullname .
'</a> - ' . userdate($activity->timestamp);
echo '</div>';
echo '</td></tr></table>';
return;
}
/**
* Pre-process the quiz options form data, making any necessary adjustments.
* Called by add/update instance in this file.
*
* @param object $quiz The variables set on the form.
*/
function quiz_process_options($quiz) {
global $CFG;
require_once($CFG->dirroot . '/mod/quiz/locallib.php');
require_once($CFG->libdir . '/questionlib.php');
$quiz->timemodified = time();
// Quiz name.
if (!empty($quiz->name)) {
$quiz->name = trim($quiz->name);
}
// Password field - different in form to stop browsers that remember passwords
// getting confused.
$quiz->password = $quiz->quizpassword;
unset($quiz->quizpassword);
// Quiz feedback
if (isset($quiz->feedbacktext)) {
// Clean up the boundary text.
for ($i = 0; $i < count($quiz->feedbacktext); $i += 1) {
if (empty($quiz->feedbacktext[$i]['text'])) {
$quiz->feedbacktext[$i]['text'] = '';
} else {
$quiz->feedbacktext[$i]['text'] = trim($quiz->feedbacktext[$i]['text']);
}
}
// Check the boundary value is a number or a percentage, and in range.
$i = 0;
while (!empty($quiz->feedbackboundaries[$i])) {
$boundary = trim($quiz->feedbackboundaries[$i]);
if (!is_numeric($boundary)) {
if (strlen($boundary) > 0 && $boundary[strlen($boundary) - 1] == '%') {
$boundary = trim(substr($boundary, 0, -1));
if (is_numeric($boundary)) {
$boundary = $boundary * $quiz->grade / 100.0;
} else {
return get_string('feedbackerrorboundaryformat', 'quiz', $i + 1);
}
}
}
if ($boundary <= 0 || $boundary >= $quiz->grade) {
return get_string('feedbackerrorboundaryoutofrange', 'quiz', $i + 1);
}
if ($i > 0 && $boundary >= $quiz->feedbackboundaries[$i - 1]) {
return get_string('feedbackerrororder', 'quiz', $i + 1);
}
$quiz->feedbackboundaries[$i] = $boundary;
$i += 1;
}
$numboundaries = $i;
// Check there is nothing in the remaining unused fields.
if (!empty($quiz->feedbackboundaries)) {
for ($i = $numboundaries; $i < count($quiz->feedbackboundaries); $i += 1) {
if (!empty($quiz->feedbackboundaries[$i]) && trim($quiz->feedbackboundaries[$i]) != '') {
return get_string('feedbackerrorjunkinboundary', 'quiz', $i + 1);
}
}
}
for ($i = $numboundaries + 1; $i < count($quiz->feedbacktext); $i += 1) {
if (!empty($quiz->feedbacktext[$i]['text']) && trim($quiz->feedbacktext[$i]['text']) != '') {
return get_string('feedbackerrorjunkinfeedback', 'quiz', $i + 1);
}
}
$quiz->feedbackboundaries[-1] = $quiz->grade + 1; // Needs to be bigger than $quiz->grade because of '<' test in quiz_feedback_for_grade().
$quiz->feedbackboundaries[$numboundaries] = 0;
$quiz->feedbackboundarycount = $numboundaries;
}
// Combing the individual settings into the review columns.
$quiz->reviewattempt = quiz_review_option_form_to_db($quiz, 'attempt');
$quiz->reviewcorrectness = quiz_review_option_form_to_db($quiz, 'correctness');
$quiz->reviewmarks = quiz_review_option_form_to_db($quiz, 'marks');
$quiz->reviewspecificfeedback = quiz_review_option_form_to_db($quiz, 'specificfeedback');
$quiz->reviewgeneralfeedback = quiz_review_option_form_to_db($quiz, 'generalfeedback');
$quiz->reviewrightanswer = quiz_review_option_form_to_db($quiz, 'rightanswer');
$quiz->reviewoverallfeedback = quiz_review_option_form_to_db($quiz, 'overallfeedback');
$quiz->reviewattempt |= mod_quiz_display_options::DURING;
$quiz->reviewoverallfeedback &= ~mod_quiz_display_options::DURING;
}
/**
* Helper function for {@link quiz_process_options()}.
* @param object $fromform the sumbitted form date.
* @param string $field one of the review option field names.
*/
function quiz_review_option_form_to_db($fromform, $field) {
static $times = array(
'during' => mod_quiz_display_options::DURING,
'immediately' => mod_quiz_display_options::IMMEDIATELY_AFTER,
'open' => mod_quiz_display_options::LATER_WHILE_OPEN,
'closed' => mod_quiz_display_options::AFTER_CLOSE,
);
$review = 0;
foreach ($times as $whenname => $when) {
$fieldname = $field . $whenname;
if (isset($fromform->$fieldname)) {
$review |= $when;
unset($fromform->$fieldname);
}
}
return $review;
}
/**
* This function is called at the end of quiz_add_instance
* and quiz_update_instance, to do the common processing.
*
* @param object $quiz the quiz object.
*/
function quiz_after_add_or_update($quiz) {
global $DB;
$cmid = $quiz->coursemodule;
// we need to use context now, so we need to make sure all needed info is already in db
$DB->set_field('course_modules', 'instance', $quiz->id, array('id'=>$cmid));
$context = get_context_instance(CONTEXT_MODULE, $cmid);