mirrored from git://git.moodle.org/moodle.git
/
moodlelib.php
1830 lines (1456 loc) · 51.5 KB
/
moodlelib.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 // $Id$
//
// moodlelib.php
//
// Large collection of useful functions used by many parts of Moodle.
//
// Martin Dougiamas, 2000
//
/// STANDARD WEB PAGE PARTS ///////////////////////////////////////////////////
function print_header ($title="", $heading="", $navigation="", $focus="", $meta="", $cache=true, $button="") {
// $title - appears top of window
// $heading - appears top of page
// $navigation - premade navigation string
// $focus - indicates form element eg inputform.password
// $meta - meta tags in the header
// $cache - should this page be cacheable?
// $button - code for a button in the top-right
global $USER, $CFG, $THEME;
if (file_exists("$CFG->dirroot/theme/$CFG->theme/styles.css")) {
$styles = "$CFG->wwwroot/theme/$CFG->theme/styles.css";
} else {
$styles = "$CFG->wwwroot/theme/standard/styles.css";
}
if (!$button and $navigation) {
if (isset($USER->id)) {
$button = "<FONT SIZE=2><A HREF=\"$CFG->wwwroot/login/logout.php\">".get_string("logout")."</A></FONT>";
} else {
$button = "<FONT SIZE=2><A HREF=\"$CFG->wwwroot/login/index.php\">".get_string("login")."</A></FONT>";
}
}
if (!$cache) { // Do everything we can to prevent clients and proxies caching
@header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
@header("Pragma: no-cache");
$meta .= "\n<META HTTP-EQUIV=\"Pragma\" CONTENT=\"no-cache\">";
$meta .= "\n<META HTTP-EQUIV=\"Expires\" CONTENT=\"0\">";
}
include ("$CFG->dirroot/theme/$CFG->theme/header.html");
}
function print_footer ($course=NULL) {
// Can provide a course object to make the footer contain a link to
// to the course home page, otherwise the link will go to the site home
global $USER, $CFG, $THEME;
if ($course) {
if ($course == "home") { // special case for site home page - please do not remove
if (!$dversion = get_field("config", "value", "name", "version")) {
$dversion = "xxx";
}
if (!$drelease = get_field("config", "value", "name", "release")) {
$drelease = "xxx";
}
$homelink = "<P ALIGN=center><A TITLE=\"Moodle $drelease ($dversion)\" HREF=\"http://moodle.com/\">";
$homelink .= "<BR><IMG WIDTH=130 HEIGHT=19 SRC=\"pix/madewithmoodle2.gif\" BORDER=0></A></P>";
} else {
$homelink = "<A TARGET=_top HREF=\"$CFG->wwwroot/course/view.php?id=$course->id\">$course->shortname</A>";
}
} else {
$homelink = "<A TARGET=_top HREF=\"$CFG->wwwroot\">".get_string("home")."</A>";
}
if ($USER->realuser) {
if ($realuser = get_record("user", "id", $USER->realuser)) {
$realuserinfo = " [$realuser->firstname $realuser->lastname] ";
}
}
if ($USER->id) {
$loggedinas = $realuserinfo.get_string("loggedinas", "moodle", "$USER->firstname $USER->lastname").
" (<A HREF=\"$CFG->wwwroot/login/logout.php\">".get_string("logout")."</A>)";
} else {
$loggedinas = get_string("loggedinnot", "moodle").
" (<A HREF=\"$CFG->wwwroot/login/index.php\">".get_string("login")."</A>)";
}
include ("$CFG->dirroot/theme/$CFG->theme/footer.html");
}
function print_navigation ($navigation) {
global $CFG;
if ($navigation) {
if (! $site = get_site()) {
$site->shortname = get_string("home");;
}
echo "<A TARGET=_top HREF=\"$CFG->wwwroot/\">$site->shortname</A> -> $navigation";
}
}
function print_heading($text, $align="CENTER", $size=3) {
echo "<P ALIGN=\"$align\"><FONT SIZE=\"$size\"><B>$text</B></FONT></P>";
}
function print_continue($link) {
global $HTTP_REFERER;
if (!$link) {
$link = $HTTP_REFERER;
}
print_heading("<A HREF=\"$link\">".get_string("continue")."</A>");
}
function print_simple_box($message, $align="", $width="", $color="#FFFFFF", $padding=5, $border=1) {
print_simple_box_start($align, $width, $color, $padding, $border);
echo "<P>$message</P>";
print_simple_box_end();
}
function print_simple_box_start($align="", $width="", $color="#FFFFFF", $padding=5, $border=1) {
global $THEME;
if ($align) {
$tablealign = "ALIGN=\"$align\"";
}
if ($width) {
$tablewidth = "WIDTH=\"$width\"";
$innertablewidth = "WIDTH=\"100%\"";
}
echo "<TABLE $tablealign $tablewidth BORDER=0 CELLPADDING=\"$border\" CELLSPACING=0>";
echo "<TR><TD BGCOLOR=\"$THEME->borders\">\n";
echo "<TABLE $innertablewidth BORDER=0 CELLPADDING=\"$padding\" CELLSPACING=0><TR><TD BGCOLOR=\"$color\">";
}
function print_simple_box_end() {
echo "</TD></TR></TABLE>";
echo "</TD></TR></TABLE>";
}
function print_single_button($link, $options, $label="OK") {
echo "<FORM ACTION=\"$link\" METHOD=GET>";
if ($options) {
foreach ($options as $name => $value) {
echo "<INPUT TYPE=hidden NAME=\"$name\" VALUE=\"$value\">";
}
}
echo "<INPUT TYPE=submit VALUE=\"$label\"></FORM>";
}
function print_spacer($height=1, $width=1, $br=true) {
global $CFG;
echo "<IMG HEIGHT=\"$height\" WIDTH=\"$width\" SRC=\"$CFG->wwwroot/pix/spacer.gif\" ALT=\"\">";
if ($br) {
echo "<BR>\n";
}
}
function print_user_picture($userid, $courseid, $picture, $large=false, $returnstring=false) {
global $CFG;
$output = "<A HREF=\"$CFG->wwwroot/user/view.php?id=$userid&course=$courseid\">";
if ($large) {
$file = "f1.jpg";
$size = 100;
} else {
$file = "f2.jpg";
$size = 35;
}
if ($picture) {
if ($CFG->slasharguments) { // Use this method if possible for better caching
$output .= "<IMG SRC=\"$CFG->wwwroot/user/pix.php/$userid/$file\" BORDER=0 WIDTH=$size HEIGHT=$size ALT=\"\">";
} else {
$output .= "<IMG SRC=\"$CFG->wwwroot/user/pix.php?file=/$userid/$file\" BORDER=0 WIDTH=$size HEIGHT=$size ALT=\"\">";
}
} else {
$output .= "<IMG SRC=\"$CFG->wwwroot/user/default/$file\" BORDER=0 WIDTH=$size HEIGHT=$size ALT=\"\">";
}
$output .= "</A>";
if ($returnstring) {
return $output;
} else {
echo $output;
}
}
function print_table($table) {
// Prints a nicely formatted table.
// $table is an object with several properties.
// $table->head is an array of heading names.
// $table->align is an array of column alignments
// $table->size is an array of column sizes
// $table->data[] is an array of arrays containing the data.
// $table->width is an percentage of the page
// $table->cellpadding padding on each cell
// $table->cellspacing spacing between cells
if (isset($table->align)) {
foreach ($table->align as $key => $aa) {
if ($aa) {
$align[$key] = " ALIGN=\"$aa\"";
} else {
$align[$key] = "";
}
}
}
if (isset($table->size)) {
foreach ($table->size as $key => $ss) {
if ($ss) {
$size[$key] = " WIDTH=\"$ss\"";
} else {
$size[$key] = "";
}
}
}
if (!$table->width) {
$table->width = "80%";
}
if (!$table->cellpadding) {
$table->cellpadding = "5";
}
if (!$table->cellspacing) {
$table->cellspacing = "1";
}
print_simple_box_start("CENTER", "$table->width", "#FFFFFF", 0);
echo "<TABLE WIDTH=100% BORDER=0 valign=top align=center ";
echo " cellpadding=\"$table->cellpadding\" cellspacing=\"$table->cellspacing\">\n";
if ($table->head) {
echo "<TR>";
foreach ($table->head as $key => $heading) {
echo "<TH ".$align[$key].$size[$key].">$heading</TH>";
}
echo "</TR>\n";
}
foreach ($table->data as $row) {
echo "<TR VALIGN=TOP>";
foreach ($row as $key => $item) {
echo "<TD ".$align[$key].$size[$key].">$item</TD>";
}
echo "</TR>\n";
}
echo "</TABLE>\n";
print_simple_box_end();
return true;
}
function print_editing_switch($courseid) {
global $CFG, $USER;
if (isteacher($courseid)) {
if ($USER->editing) {
echo "<A HREF=\"$CFG->wwwroot/course/view.php?id=$courseid&edit=off\">Turn editing off</A>";
} else {
echo "<A HREF=\"$CFG->wwwroot/course/view.php?id=$courseid&edit=on\">Turn editing on</A>";
}
}
}
function update_course_icon($courseid) {
global $CFG, $USER;
if (isteacher($courseid)) {
if ($USER->editing) {
return "<A TITLE=\"".get_string("turneditingoff")."\"
HREF=\"$CFG->wwwroot/course/view.php?id=$courseid&edit=off\"
TARGET=_top><IMG SRC=\"$CFG->wwwroot/pix/i/edit.gif\" ALIGN=right BORDER=0></A>";
} else {
return "<A TITLE=\"".get_string("turneditingon")."\"
HREF=\"$CFG->wwwroot/course/view.php?id=$courseid&edit=on\"
TARGET=_top><IMG SRC=\"$CFG->wwwroot/pix/i/edit.gif\" ALIGN=right BORDER=0></A>";
}
}
}
function update_module_icon($moduleid, $courseid) {
global $CFG;
if (isteacher($courseid)) {
return "<A TITLE=\"".get_string("editthisactivity")."\" HREF=\"$CFG->wwwroot/course/mod.php?update=$moduleid&return=true\" TARGET=_top><IMG SRC=\"$CFG->wwwroot/pix/i/edit.gif\" ALIGN=right BORDER=0></A>";
}
}
function print_date_selector($day, $month, $year, $currenttime=0) {
// Currenttime is a default timestamp in GMT
// Prints form items with the names $day, $month and $year
if (!$currenttime) {
$currenttime = time();
}
$currentdate = usergetdate($currenttime);
for ($i=1; $i<=31; $i++) {
$days[$i] = "$i";
}
for ($i=1; $i<=12; $i++) {
$months[$i] = date("F", mktime(0,0,0,$i,1,2000));
}
for ($i=2000; $i<=2010; $i++) {
$years[$i] = $i;
}
choose_from_menu($days, $day, $currentdate[mday], "");
choose_from_menu($months, $month, $currentdate[mon], "");
choose_from_menu($years, $year, $currentdate[year], "");
}
function print_time_selector($hour, $minute, $currenttime=0) {
// Currenttime is a default timestamp in GMT
// Prints form items with the names $hour and $minute
if (!$currenttime) {
$currenttime = time();
}
$currentdate = usergetdate($currenttime);
for ($i=0; $i<=23; $i++) {
$hours[$i] = sprintf("%02d",$i);
}
for ($i=0; $i<=59; $i++) {
$minutes[$i] = sprintf("%02d",$i);
}
choose_from_menu($hours, $hour, $currentdate[hours], "");
choose_from_menu($minutes, $minute, $currentdate[minutes], "");
}
function make_timestamp($year, $month=1, $day=1, $hour=0, $minute=0, $second=0) {
// Given date parts in user time, produce a GMT timestamp
return mktime((int)$hour,(int)$minute,(int)$second,(int)$month,(int)$day,(int)$year);
}
function format_time($totalsecs) {
// Given an amount of time in seconds, prints it
// nicely as months, days, hours etc as needed
$totalsecs = abs($totalsecs);
$days = floor($totalsecs/86400);
$remainder = $totalsecs - ($days*86400);
$hours = floor($remainder/3600);
$remainder = $remainder - ($hours*3600);
$mins = floor($remainder/60);
$secs = $remainder - ($mins*60);
if ($secs != 1) $ss = "s";
if ($mins != 1) $ms = "s";
if ($hours != 1) $hs = "s";
if ($days != 1) $ds = "s";
if ($days) $odays = "$days day$ds";
if ($hours) $ohours = "$hours hr$hs";
if ($mins) $omins = "$mins min$ms";
if ($secs) $osecs = "$secs sec$ss";
if ($days) return "$odays $ohours";
if ($hours) return "$ohours $omins";
if ($mins) return "$omins $osecs";
if ($secs) return "$osecs";
return get_string("now");
}
function userdate($date, $format="", $timezone=99) {
// Returns a formatted string that represents a date in user time
// WARNING: note that the format is for strftime(), not date().
global $USER;
if ($format == "") {
$format = "%A, %e %B %Y, %I:%M %p";
}
if ($timezone == 99) {
if (isset($USER->timezone)) {
$timezone = (float)$USER->timezone;
}
}
if (abs($timezone) > 12) {
return strftime("$format", $date);
}
return gmstrftime($format, $date + (int)($timezone * 3600));
}
function usergetdate($date, $timezone=99) {
// Given a $date timestamp in GMT, returns an array
// that represents the date in user time
global $USER;
if ($timezone == 99) {
$timezone = (float)$USER->timezone;
}
if (abs($timezone) > 12) {
return getdate($date);
}
//There is no gmgetdate so I have to fake it...
$date = $date + (int)($timezone * 3600);
$getdate["seconds"] = gmstrftime("%S", $date);
$getdate["minutes"] = gmstrftime("%M", $date);
$getdate["hours"] = gmstrftime("%H", $date);
$getdate["mday"] = gmstrftime("%d", $date);
$getdate["wday"] = gmstrftime("%u", $date);
$getdate["mon"] = gmstrftime("%m", $date);
$getdate["year"] = gmstrftime("%Y", $date);
$getdate["yday"] = gmstrftime("%j", $date);
$getdate["weekday"] = gmstrftime("%A", $date);
$getdate["month"] = gmstrftime("%B", $date);
return $getdate;
}
function usertime($date, $timezone=99) {
// Given a GMT timestamp (seconds since epoch), offsets it by
// the timezone. eg 3pm in India is 3pm GMT - 7 * 3600 seconds
global $USER;
if ($timezone == 99) {
$timezone = (float)$USER->timezone;
}
if (abs($timezone) > 12) {
return $date;
}
return $date - (int)($timezone * 3600);
}
function usergetmidnight($date, $timezone=99) {
// Given a time, return the GMT timestamp of the most recent midnight
// for the current user.
global $USER;
if ($timezone == 99) {
$timezone = (float)$USER->timezone;
}
$userdate = usergetdate($date, $timezone);
if (abs($timezone) > 12) {
return mktime(0, 0, 0, $userdate["mon"], $userdate["mday"], $userdate["year"]);
}
$timemidnight = gmmktime (0, 0, 0, $userdate["mon"], $userdate["mday"], $userdate["year"]);
return usertime($timemidnight, $timezone); // Time of midnight of this user's day, in GMT
}
function usertimezone($timezone=99) {
// returns a string that prints the user's timezone
global $USER;
if ($timezone == 99) {
$timezone = (float)$USER->timezone;
}
if (abs($timezone) > 12) {
return "server time";
}
if (abs($timezone) < 0.5) {
return "GMT";
}
if ($timezone > 0) {
return "GMT+$timezone";
} else {
return "GMT$timezone";
}
}
function error ($message, $link="") {
global $CFG, $SESSION;
print_header(get_string("error"));
echo "<BR>";
print_simple_box($message, "center", "", "#FFBBBB");
if (!$link) {
if ( !empty($SESSION->fromurl) ) {
$link = "$SESSION->fromurl";
unset($SESSION->fromurl);
save_session("SESSION");
} else {
$link = "$CFG->wwwroot";
}
}
print_continue($link);
print_footer();
die;
}
function helpbutton ($page, $title="", $module="moodle", $image=true, $text="") {
// $page = the keyword that defines a help page
// $title = the title of links, rollover tips, alt tags etc
// $module = which module is the page defined in
// $image = use a help image for the link? (otherwise uses text)
// $text = if defined then this text is used in the page, and
// the $page variable is ignored.
global $CFG;
if ($module == "") {
$module = "moodle";
}
if ($image) {
$linkobject = "<IMG BORDER=0 ALT=\"$title\" SRC=\"$CFG->wwwroot/pix/help.gif\">";
} else {
$linkobject = $title;
}
if ($text) {
$url = "/help.php?module=$module&text=$text";
} else {
$url = "/help.php?module=$module&file=$page.html";
}
link_to_popup_window ($url, "popup", $linkobject, 400, 500, $title);
}
function notice ($message, $link="") {
global $THEME, $HTTP_REFERER;
if (!$link) {
$link = $HTTP_REFERER;
}
echo "<BR>";
print_simple_box($message, "center", "", "$THEME->cellheading");
print_heading("<A HREF=\"$link\">".get_string("continue")."</A>");
print_footer();
die;
}
function notice_yesno ($message, $linkyes, $linkno) {
global $THEME;
print_simple_box_start("center", "", "$THEME->cellheading");
echo "<P ALIGN=CENTER><FONT SIZE=3>$message</FONT></P>";
echo "<P ALIGN=CENTER><FONT SIZE=3><B>";
echo "<A HREF=\"$linkyes\">".get_string("yes")."</A>";
echo " ";
echo "<A HREF=\"$linkno\">".get_string("no")."</A>";
echo "</B></FONT></P>";
print_simple_box_end();
}
function redirect($url, $message="", $delay=0) {
// Uses META tags to redirect the user, after printing a notice
echo "<META HTTP-EQUIV='Refresh' CONTENT='$delay; URL=$url'>";
if (!empty($message)) {
print_header();
echo "<CENTER>";
echo "<P>$message</P>";
echo "<P>( <A HREF=\"$url\">".get_string("continue")."</A> )</P>";
echo "</CENTER>";
}
die;
}
function notify ($message) {
echo "<P align=center><B><FONT COLOR=#FF0000>$message</FONT></B></P>\n";
}
/// PARAMETER HANDLING ////////////////////////////////////////////////////
function require_variable($var) {
if (! isset($var)) {
error("A required parameter was missing");
}
}
function optional_variable(&$var, $default=0) {
if (! isset($var)) {
$var = $default;
}
}
/// DATABASE HANDLING ////////////////////////////////////////////////
function execute_sql($command) {
// Completely general
global $db;
$result = $db->Execute("$command");
if ($result) {
echo "<P><FONT COLOR=green><B>".get_string("success")."</B></FONT></P>";
return true;
} else {
echo "<P><FONT COLOR=red><B>".get_string("error")."</B></FONT></P>";
return false;
}
}
function modify_database($sqlfile) {
// Assumes that the input text file consists of a number
// of SQL statements ENDING WITH SEMICOLONS. The semicolons
// MUST be the last character in a line.
// Lines that are blank or that start with "#" are ignored.
// Only tested with mysql dump files (mysqldump -p -d moodle)
if (file_exists($sqlfile)) {
$success = true;
$lines = file($sqlfile);
$command = "";
while ( list($i, $line) = each($lines) ) {
$line = chop($line);
$length = strlen($line);
if ($length && substr($line, 0, 1) <> "#") {
if (substr($line, $length-1, 1) == ";") {
$line = substr($line, 0, $length-1); // strip ;
$command .= $line;
if (! execute_sql($command)) {
$success = false;
}
$command = "";
} else {
$command .= $line;
}
}
}
} else {
$success = false;
echo "<P>Tried to modify database, but \"$sqlfile\" doesn't exist!</P>";
}
return $success;
}
function record_exists($table, $field, $value) {
global $db;
$rs = $db->Execute("SELECT * FROM $table WHERE $field = '$value' LIMIT 1");
if (!$rs) return false;
if ( $rs->RecordCount() ) {
return true;
} else {
return false;
}
}
function record_exists_sql($sql) {
global $db;
$rs = $db->Execute($sql);
if (!$rs) return false;
if ( $rs->RecordCount() ) {
return true;
} else {
return false;
}
}
function count_records($table, $selector, $value) {
// Get all the records and count them
global $db;
$rs = $db->Execute("SELECT COUNT(*) FROM $table WHERE $selector = '$value'");
if (!$rs) return 0;
return $rs->fields[0];
}
function count_records_sql($sql) {
// Get all the records and count them
global $db;
$rs = $db->Execute("$sql");
if (!$rs) return 0;
return $rs->fields[0];
}
function get_record($table, $selector, $value) {
// Get a single record as an object
global $db;
$rs = $db->Execute("SELECT * FROM $table WHERE $selector = '$value'");
if (!$rs) return false;
if ( $rs->RecordCount() == 1 ) {
return (object)$rs->fields;
} else {
return false;
}
}
function get_record_sql($sql) {
// Get a single record as an object
// The sql statement is provided as a string.
global $db;
$rs = $db->Execute("$sql");
if (!$rs) return false;
if ( $rs->RecordCount() == 1 ) {
return (object)$rs->fields;
} else {
return false;
}
}
function get_records($table, $selector, $value, $sort="") {
// Get a number of records as an array of objects
// Can optionally be sorted eg "time ASC" or "time DESC"
// The "key" is the first column returned, eg usually "id"
global $db;
if ($sort) {
$sortorder = "ORDER BY $sort";
}
$sql = "SELECT * FROM $table WHERE $selector = '$value' $sortorder";
return get_records_sql($sql);
}
function get_records_sql($sql) {
// Get a number of records as an array of objects
// The "key" is the first column returned, eg usually "id"
// The sql statement is provided as a string.
global $db;
$rs = $db->Execute("$sql");
if (!$rs) return false;
if ( $rs->RecordCount() > 0 ) {
if ($records = $rs->GetAssoc(true)) {
foreach ($records as $key => $record) {
$objects[$key] = (object) $record;
}
return $objects;
} else {
return false;
}
} else {
return false;
}
}
function get_records_sql_menu($sql) {
// Given an SQL select, this function returns an associative
// array of the first two columns. This is most useful in
// combination with the choose_from_menu function to create
// a form menu.
global $db;
$rs = $db->Execute("$sql");
if (!$rs) return false;
if ( $rs->RecordCount() > 0 ) {
while (!$rs->EOF) {
$menu[$rs->fields[0]] = $rs->fields[1];
$rs->MoveNext();
}
return $menu;
} else {
return false;
}
}
function get_field($table, $field, $selector, $value) {
global $db;
$rs = $db->Execute("SELECT $field FROM $table WHERE $selector = '$value'");
if (!$rs) return false;
if ( $rs->RecordCount() == 1 ) {
return $rs->fields["$field"];
} else {
return false;
}
}
function set_field($table, $field, $newvalue, $selector, $value) {
global $db;
return $db->Execute("UPDATE $table SET $field = '$newvalue' WHERE $selector = '$value'");
}
function delete_records($table, $selector, $value) {
// Delete one or more records from a table
global $db;
return $db->Execute("DELETE FROM $table WHERE $selector = '$value'");
}
function insert_record($table, $dataobject) {
// Insert a record into a table and return the "id" field
// $dataobject is an object containing needed data
global $db;
// Determine all the fields needed
if (! $columns = $db->MetaColumns("$table")) {
return false;
}
$data = (array)$dataobject;
// Pull out data matching these fields
foreach ($columns as $column) {
if ($column->name <> "id" && isset($data[$column->name]) ) {
$ddd[$column->name] = $data[$column->name];
}
}
// Construct SQL queries
if (! $numddd = count($ddd)) {
return 0;
}
$count = 0;
$insert = "";
$select = "";
foreach ($ddd as $key => $value) {
$count++;
$insert .= "$key = '$value'";
$select .= "$key = '$value'";
if ($count < $numddd) {
$insert .= ", ";
$select .= " AND ";
}
}
if (! $rs = $db->Execute("INSERT INTO $table SET $insert")) {
return false;
}
// Pull it out again to find the id. This is the most cross-platform method.
if ($rs = $db->Execute("SELECT id FROM $table WHERE $select")) {
return $rs->fields[0];
} else {
return false;
}
}
function update_record($table, $dataobject) {
// Update a record in a table
// $dataobject is an object containing needed data
global $db;
if (! isset($dataobject->id) ) {
return false;
}
// Determine all the fields in the table
if (!$columns = $db->MetaColumns($table)) {
return false;
}
$data = (array)$dataobject;
// Pull out data matching these fields
foreach ($columns as $column) {
if ($column->name <> "id" && isset($data[$column->name]) ) {
$ddd[$column->name] = $data[$column->name];
}
}
// Construct SQL queries
$numddd = count($ddd);
$count = 0;
$update = "";
foreach ($ddd as $key => $value) {
$count++;
$update .= "$key = '$value'";
if ($count < $numddd) {
$update .= ", ";
}
}
if ($rs = $db->Execute("UPDATE $table SET $update WHERE id = '$dataobject->id'")) {
return true;
} else {
return false;
}
}
function print_object($object) {
// Mostly just for debugging
$array = (array)$object;
foreach ($array as $key => $item) {
echo "$key -> $item <BR>";
}
}
/// USER DATABASE ////////////////////////////////////////////////
function get_user_info_from_db($field, $value) {
global $db;
if (!$field || !$value)
return false;
$result = $db->Execute("SELECT * FROM user WHERE $field = '$value' AND deleted <> '1'");
if ( $result->RecordCount() == 1 ) {
$user = (object)$result->fields;
$rs = $db->Execute("SELECT course FROM user_students WHERE user = '$user->id' ");
while (!$rs->EOF) {
$course = $rs->fields["course"];
$user->student["$course"] = true;
$rs->MoveNext();
}
$rs = $db->Execute("SELECT course FROM user_teachers WHERE user = '$user->id' ");
while (!$rs->EOF) {
$course = $rs->fields["course"];
$user->teacher["$course"] = true;
$rs->MoveNext();
}
$rs = $db->Execute("SELECT * FROM user_admins WHERE user = '$user->id' ");
while (!$rs->EOF) {
$user->admin = true;
$rs->MoveNext();
}
if ($course = get_site()) {
// Everyone is always a member of the top course
$user->student["$course->id"] = true;
}
return $user;
} else {
return false;
}
}
function update_user_in_db() {
global $db, $USER, $REMOTE_ADDR;
if (!isset($USER->id))
return false;
$timenow = time();
if ($db->Execute("UPDATE LOW_PRIORITY user SET lastIP='$REMOTE_ADDR', lastaccess='$timenow'
WHERE id = '$USER->id' ")) {
return true;
} else {
return false;
}
}
function require_login($courseid=0) {
// This function checks that the current user is logged in, and optionally
// whether they are "logged in" or allowed to be in a particular course.
// If not, then it redirects them to the site login or course enrolment.
global $CFG, $SESSION, $USER, $FULLME, $HTTP_REFERER, $PHPSESSID;
// First check that the user is logged in to the site.
if (! (isset($USER->loggedin) and $USER->confirmed and ($USER->site == $CFG->wwwroot)) ) { // They're not
$SESSION->wantsurl = $FULLME;
$SESSION->fromurl = $HTTP_REFERER;
save_session("SESSION");
$USER = NULL;
save_session("USER");
if ($PHPSESSID) { // Cookies not enabled.
redirect("$CFG->wwwroot/login/index.php?PHPSESSID=$PHPSESSID");
} else {
redirect("$CFG->wwwroot/login/index.php");
}
die;
}
// Next, check if the user can be in a particular course
if ($courseid) {
if ($USER->student[$courseid] || $USER->teacher[$courseid] || $USER->admin) {
if (!isset($USER->realuser)) { // Don't update if this isn't a realuser
update_user_in_db();
}
return; // user is a member of this course.
}
if (! $course = get_record("course", "id", $courseid)) {