From: dongsheng <dongsheng>
Date: Fri, 12 Dec 2008 02:30:56 +0000 (+0000)
Subject: "MDL-14129, fix error() in forum module"
X-Git-Url: http://git.mjollnir.org/gw?a=commitdiff_plain;h=12e57b92ea199366d7f1eeb76c902c0bb1adc65f;p=moodle.git

"MDL-14129, fix error() in forum module"
---

diff --git a/lang/en_utf8/error.php b/lang/en_utf8/error.php
index 059d6771c8..959fc82715 100644
--- a/lang/en_utf8/error.php
+++ b/lang/en_utf8/error.php
@@ -361,7 +361,7 @@ $string['nopermissiontoupdateblock'] = 'No permission to update $a!';
 $string['nopermissiontoviewpage'] = 'You are not allowed to look at this page';
 $string['nopermissiontoviewletergrade'] = 'Missing permission to view letter grades';
 $string['nopermissiontomanagegroup'] = 'You do not have the required permissions to manage groups';
-$string['nosite'] = 'No sites';
+$string['nosite'] = 'Could not find a top-level course!';
 $string['nositeid'] = 'No site ID';
 $string['nofolder'] = 'Requested directory does not exist';
 $string['nostatstodisplay'] = 'Sorry, there is no available data to display';
diff --git a/lang/en_utf8/forum.php b/lang/en_utf8/forum.php
index 201df84002..a264e9b933 100644
--- a/lang/en_utf8/forum.php
+++ b/lang/en_utf8/forum.php
@@ -20,6 +20,7 @@ $string['allowsallsubscribe'] = 'This forum allows everyone to choose whether to
 $string['allowsdiscussions'] = 'This forum allows each person to start one discussion topic.';
 $string['allsubscribe'] = 'Subscribe to all forums';
 $string['allunsubscribe'] = 'Unsubscribe from all forums';
+$string['alreadyfirstpost'] = 'This is already the first post in the discussion';
 $string['anyfile'] = 'Any file';
 $string['areaintro'] = 'Forum introduction';
 $string['attachment'] = 'Attachment';
@@ -29,17 +30,37 @@ $string['blockafter'] = 'Post threshold for blocking';
 $string['blockperiod'] = 'Time period for blocking';
 $string['blockperioddisabled'] = 'Don\'t block';
 $string['bynameondate'] = 'by $a->name - $a->date';
-$string['cannotviewpostyet'] = 'You cannot read other students questions in this discussion yet because you haven\'t posted';
+$string['cannotadd'] = 'Could not add the discussion for this forum';
+$string['cannotaddteacherforumto'] = 'Could not add converted teacher forum instance to section 0 in the course';
 $string['cannotadddiscussion'] = 'Adding discussions to this forum requires group membership.';
 $string['cannotadddiscussionall'] = 'You do not have permission to add a new discussion topic for all participants.';
+$string['cannotaddsubscriber'] = 'Could not add subscriber with id $a to this forum!';
+$string['cannotcreateinstanceforteacher'] = 'Could not create new course module instance for the teacher forum';
+$string['cannotcreatediscussion'] = 'Could not create new discussion';
+$string['cannotconvertteachertogeneral'] = 'Could not change forum from type teacher to type general';
 $string['cannotdeleteforummodule'] = 'You can not delete the forum module.';
+$string['cannotdeletepost'] = 'You can\'t delete this post!';
+$string['cannoteditposts'] = 'You can\'t edit other people\'s posts!';
 $string['cannotsubscribe'] = 'Sorry, but you must be a group member to subscribe.';
+$string['cannotsplit'] = 'Discussions from this forum cannot be split';
 $string['cannotunsubscribe'] = 'Could not unsubscribe you from that forum';
-$string['cannotaddsubscriber'] = 'Could not add subscriber with id $a to this forum!';
+$string['cannotupdatecoursemoudle'] = 'Could not update course module with section id';
+$string['cannotupdatediscussion'] = 'Could not update the discussion';
+$string['cannotupdateforum'] = 'Can not update forum';
+$string['cannotupdatefirstpost'] = 'Could not update the first post';
+$string['cannotupdatepost'] = 'You can not update this post';
 $string['cannotremovesubscriber'] = 'Could not remove subscriber with id $a from this forum!';
+$string['cannotreply'] = 'You cannot reply to this post';
 $string['cannotfindorcreateforum'] = 'Could not find or create a main news forum for the site';
 $string['cannotfindfirstpost'] = 'Could not find the first post in this forum';
+$string['cannotfinddisscussion'] = 'Could not find the discussion in this forum';
 $string['cannottrack'] = 'Could not stop tracking that forum';
+$string['cannotmovefromsingleforum'] = 'Cannot move discussion from a simple single discussion forum';
+$string['cannotmovetonotexist'] = 'You can\'t move to that forum - it doesn\'t exist!';
+$string['cannotmovetonotfound'] = 'Target forum not found in this course.';
+$string['cannotmovenotvisible'] = 'Forum not visible';
+$string['cannotpurgecachedrss'] = 'Could not purge the cached RSS feeds for the source and/or destination forum(s) - check your file permissionsforums';
+$string['cannotviewpostyet'] = 'You cannot read other students questions in this discussion yet because you haven\'t posted';
 $string['cleanreadtime'] = 'Mark old posts as read hour';
 $string['completiondiscussions'] = 'User must create discussions:';
 $string['completiondiscussionshelp'] = 'requiring discussions to complete';
@@ -96,6 +117,7 @@ $string['eachuserforum'] = 'Each person posts one discussion';
 $string['edit'] = 'Edit';
 $string['editedby'] = 'Edited by $a->name - original submission $a->date';
 $string['editing'] = 'Editing';
+$string['errorwhiledelete'] = 'An error occurred while deleting record.';
 $string['emptymessage'] = 'Something was wrong with your post.  Perhaps you left it blank, or the attachment was too big.  Your changes have NOT been saved.';
 $string['everyonecanchoose'] = 'Everyone can choose to be subscribed';
 $string['everyonecannowchoose'] = 'Everyone can now choose to be subscribed'; 
@@ -151,8 +173,9 @@ $string['learningforums'] = 'Learning forums';
 $string['logblocked'] = 'Log blocked emails';
 $string['longpost'] = 'Long post';
 $string['invalidforumid'] = 'Forum ID was incorrect';
-$string['invaliddiscussionid'] = 'Discussion ID was incorrect';
+$string['invaliddiscussionid'] = 'Discussion ID was incorrect or no longer exists';
 $string['invalidpostid'] = 'Invalid Post ID - $a';
+$string['invalidparentpostid'] = 'Parent post ID was incorrect';
 $string['invalidaccess'] = 'This page was not accessed correctly';
 $string['mailnow'] = 'Mail now';
 $string['manydiscussions'] = 'Discussions per page';
@@ -193,14 +216,18 @@ $string['noguesttracking'] = 'Sorry, guests are not allowed to set tracking opti
 $string['nomorepostscontaining'] = 'No more posts containing \'$a\' were found';
 $string['nonews'] = 'No news has been posted yet';
 $string['nopermissiontosubscribe']  = 'You do not have the permission to view forum subscribers';
+$string['nopermissiontoview'] = 'You do not have permissions to view this post';
 $string['nopostforum'] = 'Sorry, you are not allowed to post to this forum';
 $string['noposts'] = 'No posts';
 $string['nopostscontaining'] = 'No posts containing \'$a\' were found';
 $string['noquestions'] = 'There are no questions yet in this forum';
 $string['nosubscribers'] = 'There are no subscribers yet for this forum';
+$string['notexists'] = 'Discussion no longer exists';
 $string['nothingnew'] = 'Nothing new for $a';
 $string['notingroup'] = 'Sorry, but you need to be part of a group to see this forum.';
+$string['notinstalled'] = 'The forum module is not installed';
 $string['notrackforum'] = 'Don\'t track unread posts';
+$string['notpartofdiscussion'] = 'This post is not part of a discussion!';
 $string['norate'] = 'Rating of items not allowed!';
 $string['noviewrate'] = 'You do not have the capability to view post ratings';
 $string['noviewanyrate'] = 'You can only look at results for posts that you made';
diff --git a/mod/forum/discuss.php b/mod/forum/discuss.php
index db1c1414db..6c1f5169b3 100644
--- a/mod/forum/discuss.php
+++ b/mod/forum/discuss.php
@@ -14,11 +14,11 @@
     $postid = optional_param('postid', 0, PARAM_INT);        // Used for tracking read posts if user initiated.
 
     if (!$discussion = $DB->get_record('forum_discussions', array('id' => $d))) {
-        error("Discussion ID was incorrect or no longer exists");
+        print_error('invaliddiscussionid', 'forum');
     }
 
     if (!$course = $DB->get_record('course', array('id' => $discussion->course))) {
-        error("Course ID is incorrect - discussion is faulty");
+        print_error('invalidcourseid');
     }
 
     if (!$forum = $DB->get_record('forum', array('id' => $discussion->forum))) {
@@ -26,7 +26,7 @@
     }
 
     if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) {
-        error('Course Module ID was incorrect');
+        print_error('invalidcoursemodule');
     }
 
     require_course_login($course, true, $cm);
@@ -38,7 +38,7 @@
         if (!($USER->id == $discussion->userid || (($discussion->timestart == 0
             || $discussion->timestart <= time())
             && ($discussion->timeend == 0 || $discussion->timeend > time())))) {
-            error('Discussion ID was incorrect or no longer exists', "$CFG->wwwroot/mod/forum/view.php?f=$forum->id");
+            print_error('invaliddiscussionid', 'forum', "$CFG->wwwroot/mod/forum/view.php?f=$forum->id");
         }
     }
 
@@ -49,19 +49,19 @@
         require_capability('mod/forum:movediscussions', $modcontext);
 
         if ($forum->type == 'single') {
-            error('Cannot move discussion from a simple single discussion forum', $return);
+            print_error('cannotmovefromsingleforum', 'forum', $return);
         }
 
         if (!$forumto = $DB->get_record('forum', array('id' => $move))) {
-            error('You can\'t move to that forum - it doesn\'t exist!', $return);
+            print_error('cannotmovetonotexist', 'forum', $return);
         }
 
         if (!$cmto = get_coursemodule_from_instance('forum', $forumto->id, $course->id)) {
-            error('Target forum not found in this course.', $return);
+            print_error('cannotmovetonotfound', 'forum', $return);
         }
 
         if (!coursemodule_visible_for_user($cmto)) {
-            error('Forum not visible', $return);
+            print_error('cannotmovenotvisible', 'forum', $return);
         }
 
         if (!forum_move_attachments($discussion, $forum->id, $forumto->id)) {
@@ -78,8 +78,7 @@
         // the regeneration of the feeds since the discussions have been
         // moved.
         if (!forum_rss_delete_file($forum) || !forum_rss_delete_file($forumto)) {
-            error('Could not purge the cached RSS feeds for the source and/or'.
-                   'destination forum(s) - check your file permissionsforums', $return);
+            print_error('cannotpurgecachedrss', 'forum', $return);
         }
 
         redirect($return.'&amp;moved=-1&amp;sesskey='.sesskey());
@@ -110,12 +109,12 @@
     }
 
     if (! $post = forum_get_post_full($parent)) {
-        error("Discussion no longer exists", "$CFG->wwwroot/mod/forum/view.php?f=$forum->id");
+        print_error("notexists", 'forum', "$CFG->wwwroot/mod/forum/view.php?f=$forum->id");
     }
 
 
     if (!forum_user_can_view_post($post, $course, $cm, $forum, $discussion)) {
-        error('You do not have permissions to view this post', "$CFG->wwwroot/mod/forum/view.php?id=$forum->id");
+        print_error('nopermissiontoview', 'forum', "$CFG->wwwroot/mod/forum/view.php?id=$forum->id");
     }
 
     if ($mark == 'read' or $mark == 'unread') {
diff --git a/mod/forum/index.php b/mod/forum/index.php
index f7dc2f0dc3..6afbead00e 100644
--- a/mod/forum/index.php
+++ b/mod/forum/index.php
@@ -9,11 +9,11 @@
 
     if ($id) {
         if (! $course = $DB->get_record('course', array('id' => $id))) {
-            error("Course ID is incorrect");
+            print_error('invalidcourseid');
         }
     } else {
         if (! $course = get_site()) {
-            error("Could not find a top-level course!");
+            print_error('nosite');
         }
     }
 
diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index 7942bb51a8..f2dd41a816 100644
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -78,7 +78,7 @@ function forum_add_instance($forum) {
         $message = '';
 
         if (! forum_add_discussion($discussion, null, $message)) {
-            error('Could not add the discussion for this forum');
+            print_error('cannotadd', 'forum');
         }
     }
 
@@ -138,11 +138,11 @@ function forum_update_instance($forum) {
                 notify('Warning! There is more than one discussion in this forum - using the most recent');
                 $discussion = array_pop($discussions);
             } else {
-                error('Could not find the discussion in this forum');
+                print_error('cannotfinddisscussion', 'forum');
             }
         }
         if (! $post = $DB->get_record('forum_posts', array('id'=>$discussion->firstpost))) {
-            error('Could not find the first post in this forum discussion');
+            print_error('cannotfindfirstpost', 'forum');
         }
 
         $post->subject  = $forum->name;
@@ -150,18 +150,18 @@ function forum_update_instance($forum) {
         $post->modified = $forum->timemodified;
 
         if (! $DB->update_record('forum_posts', ($post))) {
-            error('Could not update the first post');
+            print_error('cannotupdatefirstpost', 'forum');
         }
 
         $discussion->name = $forum->name;
 
         if (! $DB->update_record('forum_discussions', ($discussion))) {
-            error('Could not update the discussion');
+            print_error('cannotupdatediscussion', 'forum');
         }
     }
 
     if (!$DB->update_record('forum', $forum)) {
-        error('Can not update forum');
+        print_error('cannotupdateforum', 'forum');
     }
 
     forum_grade_item_update($forum);
@@ -1063,7 +1063,7 @@ function forum_user_complete($course, $user, $mod, $forum) {
     if ($posts = forum_get_user_posts($forum->id, $user->id)) {
 
         if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) {
-            error('Course Module ID was incorrect');
+            print_error('invalidcoursemodule');
         }
         $discussions = forum_get_user_involved_discussions($forum->id, $user->id);
 
@@ -1745,7 +1745,7 @@ function forum_get_readable_forums($userid, $courseid=0) {
     require_once($CFG->dirroot.'/course/lib.php');
 
     if (!$forummod = $DB->get_record('modules', array('name' => 'forum'))) {
-        error('The forum module is not installed');
+        print_error('notinstalled', 'forum');
     }
 
     if ($courseid) {
@@ -2838,7 +2838,7 @@ function forum_make_mail_post($course, $cm, $forum, $discussion, $post, $userfro
 
     if (!isset($userto->viewfullnames[$forum->id])) {
         if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) {
-            error('Course Module ID was incorrect');
+            print_error('invalidcoursemodule');
         }
         $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
         $viewfullnames = has_capability('moodle/site:viewfullnames', $modcontext, $userto->id);
@@ -2878,7 +2878,7 @@ function forum_make_mail_post($course, $cm, $forum, $discussion, $post, $userfro
         $groups = $userfrom->groups[$forum->id];
     } else {
         if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) {
-            error('Course Module ID was incorrect');
+            print_error('invalidcoursemodule');
         }
         $group = groups_get_all_groups($course->id, $userfrom->id, $cm->groupingid);
     }
@@ -3327,7 +3327,7 @@ function forum_print_discussion_header(&$post, $forum, $group=-1, $datestring=""
 
     if (empty($modcontext)) {
         if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
-            error('Course Module ID was incorrect');
+            print_error('invalidcoursemodule');
         }
         $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
     }
@@ -4670,7 +4670,7 @@ function forum_user_can_post_discussion($forum, $currentgroup=null, $unused=-1,
     if (!$cm) {
         debugging('missing cm', DEBUG_DEVELOPER);
         if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
-            error('Course Module ID was incorrect');
+            print_error('invalidcoursemodule');
         }
     }
 
@@ -4739,14 +4739,14 @@ function forum_user_can_post($forum, $discussion, $user=NULL, $cm=NULL, $course=
     if (!$cm) {
         debugging('missing cm', DEBUG_DEVELOPER);
         if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
-            error('Course Module ID was incorrect');
+            print_error('invalidcoursemodule');
         }
     }
 
     if (!$course) {
         debugging('missing course', DEBUG_DEVELOPER);
         if (!$course = $DB->get_record('course', array('id' => $forum->course))) {
-            error('Incorrect course id');
+            print_error('invalidcourseid');
         }
     }
 
@@ -4889,7 +4889,7 @@ function forum_user_can_see_post($forum, $discussion, $post, $user=NULL, $cm=NUL
     if (!$cm) {
         debugging('missing cm', DEBUG_DEVELOPER);
         if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
-            error('Course Module ID was incorrect');
+            print_error('invalidcoursemodule');
         }
     }
 
@@ -4950,7 +4950,7 @@ function forum_print_latest_discussions($course, $forum, $maxdiscussions=-1, $di
 
     if (!$cm) {
         if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
-            error('Course Module ID was incorrect');
+            print_error('invalidcoursemodule');
         }
     }
     $context = get_context_instance(CONTEXT_MODULE, $cm->id);
@@ -6696,7 +6696,7 @@ function forum_check_throttling($forum, $cm=null) {
 
     if (!$cm) {
         if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
-            error('Course Module ID was incorrect');
+            print_error('invalidcoursemodule');
         }
     }
 
@@ -6964,14 +6964,14 @@ function forum_convert_to_roles($forum, $forummodid, $teacherroles=array(),
             $mod->groupmode = 0;
 
             if (!$cmid = add_course_module($mod)) {
-                error('Could not create new course module instance for the teacher forum');
+                print_error('cannotcreateinstanceforteacher', 'forum');
             } else {
                 $mod->coursemodule = $cmid;
                 if (!$sectionid = add_mod_to_section($mod)) {
-                    error('Could not add converted teacher forum instance to section 0 in the course');
+                    print_error('cannotaddteacherforumto', 'forum');
                 } else {
                     if (!$DB->set_field('course_modules', 'section', $sectionid, array('id' => $cmid))) {
-                        error('Could not update course module with section id');
+                        print_error('cannotupdatecoursemoudle', 'forum');
                     }
                 }
             }
@@ -6979,7 +6979,7 @@ function forum_convert_to_roles($forum, $forummodid, $teacherroles=array(),
             // Change the forum type to general.
             $forum->type = 'general';
             if (!$DB->update_record('forum', $forum)) {
-                error('Could not change forum from type teacher to type general');
+                print_error('cannotconvertteachertogeneral', 'forum');
             }
 
             $context = get_context_instance(CONTEXT_MODULE, $cmid);
diff --git a/mod/forum/markposts.php b/mod/forum/markposts.php
index 3074a84437..564065d7ac 100644
--- a/mod/forum/markposts.php
+++ b/mod/forum/markposts.php
@@ -11,15 +11,15 @@
     $returnpage = optional_param('returnpage', 'index.php', PARAM_FILE);    // Page to return to.
 
     if (! $forum = $DB->get_record("forum", array("id" => $f))) {
-        error("Forum ID was incorrect");
+        print_error('invalidforumid', 'forum');
     }
 
     if (! $course = $DB->get_record("course", array("id" => $forum->course))) {
-        error("Forum doesn't belong to a course!");
+        print_error('invalidcourseid');
     }
 
     if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {
-        error("Incorrect cm!");
+        print_error('invalidcoursemodule');
     }
 
     $user = $USER;
@@ -53,7 +53,7 @@
     if ($mark == 'read') {
         if (!empty($d)) {
             if (! $discussion = $DB->get_record('forum_discussions', array('id'=> $d, 'forum'=> $forum->id))) {
-                error("Discussion ID was incorrect");
+                print_error('invaliddiscussionid', 'forum');
             }
 
             if (forum_tp_mark_discussion_read($user, $d)) {
@@ -78,7 +78,7 @@
 //            add_to_log($course->id, "forum", "mark unread", "view.php?f=$forum->id", $forum->id, $cm->id);
 //            redirect($returnto, get_string("nowtracking", "forum", $info), 1);
 //        } else {
-//            error("Could not start tracking that forum", $_SERVER["HTTP_REFERER"]);
+//            print_error("Could not start tracking that forum", $_SERVER["HTTP_REFERER"]);
 //        }
     }
 
diff --git a/mod/forum/post.php b/mod/forum/post.php
index 9c7684c5f3..b6249bfe9e 100644
--- a/mod/forum/post.php
+++ b/mod/forum/post.php
@@ -31,25 +31,25 @@
 
         if (!empty($forum)) {      // User is starting a new discussion in a forum
             if (! $forum = $DB->get_record('forum', array('id' => $forum))) {
-                error('The forum number was incorrect');
+                print_error('invalidforumid', 'forum');
             }
         } else if (!empty($reply)) {      // User is writing a new reply
             if (! $parent = forum_get_post_full($reply)) {
-                error('Parent post ID was incorrect');
+                print_error('invalidparentpostid', 'forum');
             }
             if (! $discussion = $DB->get_record('forum_discussions', array('id' => $parent->discussion))) {
-                error('This post is not part of a discussion!');
+                print_error('notpartofdiscussion', 'forum');
             }
             if (! $forum = $DB->get_record('forum', array('id' => $discussion->forum))) {
-                error('The forum number was incorrect');
+                print_error('invalidforumid');
             }
         }
         if (! $course = $DB->get_record('course', array('id' => $forum->course))) {
-            error('The course number was incorrect');
+            print_error('invalidcourseid');
         }
 
         if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) { // For the logs
-            error('Could not get the course module for the forum instance.');
+            print_error('invalidcoursemodule');
         } else {
             $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
         }
@@ -71,13 +71,13 @@
 
     if (!empty($forum)) {      // User is starting a new discussion in a forum
         if (! $forum = $DB->get_record("forum", array("id" => $forum))) {
-            error("The forum number was incorrect ($forum)");
+            print_error('invalidforumid', 'forum');
         }
         if (! $course = $DB->get_record("course", array("id" => $forum->course))) {
-            error("The course number was incorrect ($forum->course)");
+            print_error('invalidcourseid');
         }
         if (! $cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {
-            error("Incorrect course module");
+            print_error("invalidcoursemodule");
         }
 
         $coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
@@ -125,19 +125,19 @@
     } else if (!empty($reply)) {      // User is writing a new reply
 
         if (! $parent = forum_get_post_full($reply)) {
-            error("Parent post ID was incorrect");
+            print_error('invalidparentpostid', 'forum');
         }
         if (! $discussion = $DB->get_record("forum_discussions", array("id" => $parent->discussion))) {
-            error("This post is not part of a discussion!");
+            print_error('notpartofdiscussion', 'forum');
         }
         if (! $forum = $DB->get_record("forum", array("id" => $discussion->forum))) {
-            error("The forum number was incorrect ($discussion->forum)");
+            print_error('invalidforumid', 'forum');
         }
         if (! $course = $DB->get_record("course", array("id" => $discussion->course))) {
-            error("The course number was incorrect ($discussion->course)");
+            print_error('invalidcourseid');
         }
         if (! $cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {
-            error("Incorrect cm");
+            print_error('invalidcoursemodule');
         }
 
         $coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
@@ -191,37 +191,37 @@
     } else if (!empty($edit)) {  // User is editing their own post
 
         if (! $post = forum_get_post_full($edit)) {
-            error("Post ID was incorrect");
+            print_error('invalidpostid', 'forum');
         }
         if ($post->parent) {
             if (! $parent = forum_get_post_full($post->parent)) {
-                error("Parent post ID was incorrect ($post->parent)");
+                print_error('invalidparentpostid', 'forum');
             }
         }
 
         if (! $discussion = $DB->get_record("forum_discussions", array("id" => $post->discussion))) {
-            error("This post is not part of a discussion! ($edit)");
+            print_error('notpartofdiscussion', 'forum');
         }
         if (! $forum = $DB->get_record("forum", array("id" => $discussion->forum))) {
-            error("The forum number was incorrect ($discussion->forum)");
+            print_error('invalidforumid', 'forum');
         }
         if (! $course = $DB->get_record("course", array("id" => $discussion->course))) {
-            error("The course number was incorrect ($discussion->course)");
+            print_error('invalidcourseid');
         }
         if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {
-            error('Could not get the course module for the forum instance.');
+            print_error('invalidcoursemodule');
         } else {
             $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
         }
         if (!($forum->type == 'news' && !$post->parent && $discussion->timestart > time())) {
             if (((time() - $post->created) > $CFG->maxeditingtime) and
                         !has_capability('mod/forum:editanypost', $modcontext)) {
-                error( get_string("maxtimehaspassed", "forum", format_time($CFG->maxeditingtime)) );
+                print_error('maxtimehaspassed', 'forum', '', format_time($CFG->maxeditingtime));
             }
         }
         if (($post->userid <> $USER->id) and
                     !has_capability('mod/forum:editanypost', $modcontext)) {
-            error("You can't edit other people's posts!");
+            print_error('cannoteditposts', 'forum');
         }
 
 
@@ -239,19 +239,19 @@
     }else if (!empty($delete)) {  // User is deleting a post
 
         if (! $post = forum_get_post_full($delete)) {
-            error("Post ID was incorrect");
+            print_error('invalidpostid', 'forum');
         }
         if (! $discussion = $DB->get_record("forum_discussions", array("id" => $post->discussion))) {
-            error("This post is not part of a discussion!");
+            print_error('notpartofdiscussion', 'forum');
         }
         if (! $forum = $DB->get_record("forum", array("id" => $discussion->forum))) {
-            error("The forum number was incorrect ($discussion->forum)");
+            print_error('invalidforumid', 'forum');
         }
         if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $forum->course)) {
-            error('Could not get the course module for the forum instance.');
+            print_error('invalidcoursemodule');
         }
         if (!$course = $DB->get_record('course', array('id' => $forum->course))) {
-            error('Incorrect course');
+            print_error('invalidcourseid');
         }
 
         require_login($course, false, $cm);
@@ -259,7 +259,7 @@
 
         if ( !(($post->userid == $USER->id && has_capability('mod/forum:deleteownpost', $modcontext))
                     || has_capability('mod/forum:deleteanypost', $modcontext)) ) {
-            error("You can't delete this post!");
+            print_error('cannotdeletepost', 'forum');
         }
 
 
@@ -304,7 +304,7 @@
 
                     redirect(forum_go_back_to($discussionurl));
                 } else {
-                    error("An error occurred while deleting record $post->id");
+                    print_error('errorwhiledelete', 'forum');
                 }
             }
 
@@ -346,27 +346,27 @@
     } else if (!empty($prune)) {  // Pruning
 
         if (!$post = forum_get_post_full($prune)) {
-            error("Post ID was incorrect");
+            print_error('invalidpostid', 'forum');
         }
         if (!$discussion = $DB->get_record("forum_discussions", array("id" => $post->discussion))) {
-            error("This post is not part of a discussion!");
+            print_error('notpartofdiscussion', 'forum');
         }
         if (!$forum = $DB->get_record("forum", array("id" => $discussion->forum))) {
-            error("The forum number was incorrect ($discussion->forum)");
+            print_error('invalidforumid', 'forum');
         }
         if ($forum->type == 'single') {
-            error('Discussions from this forum cannot be split');
+            print_error('cannotsplit', 'forum');
         }
         if (!$post->parent) {
-            error('This is already the first post in the discussion');
+            print_error('alreadyfirstpost', 'forum');
         }
         if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $forum->course)) { // For the logs
-            error('Could not get the course module for the forum instance.');
+            print_error('invalidcoursemodule');
         } else {
             $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
         }
         if (!has_capability('mod/forum:splitdiscussions', $modcontext)) {
-            error("You can't split discussions!");
+            print_error('cannotsplit', 'forum');
         }
 
         if (!empty($name) && confirm_sesskey()) {    // User has confirmed the prune
@@ -384,7 +384,7 @@
             $newdiscussion->timeend      = $discussion->timeend;
 
             if (!$newid = $DB->insert_record('forum_discussions', $newdiscussion)) {
-                error('Could not create new discussion');
+                print_error('cannotcreatediscussion', 'forum');
             }
 
             $newpost = new object();
@@ -393,7 +393,7 @@
             $newpost->subject = $name;
 
             if (!$DB->update_record("forum_posts", $newpost)) {
-                error('Could not update the original post');
+                print_error('cannotupdatediscussion', 'forum');
             }
 
             forum_change_discussionid($post->id, $newid);
@@ -428,7 +428,7 @@
         print_footer($course);
         die;
     } else {
-        error("No operation specified");
+        print_error('unknowaction');
 
     }
 
@@ -441,7 +441,7 @@
 // from now on user must be logged on properly
 
     if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) { // For the logs
-        error('Could not get the course module for the forum instance.');
+        print_error('invalidcoursemodule');
     }
     $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
     require_login($course->id, false, $cm);
@@ -555,7 +555,7 @@
             if ( !(($realpost->userid == $USER->id && (has_capability('mod/forum:replypost', $modcontext)
                                 || has_capability('mod/forum:startdiscussion', $modcontext))) ||
                                 has_capability('mod/forum:editanypost', $modcontext)) ) {
-                error("You can not update this post");
+                print_error('cannotupdatepost', 'forum');
             }
 
             $updatepost = $fromform; //realpost
@@ -649,7 +649,7 @@
 
         } else {                     // Adding a new discussion
             if (!forum_user_can_post_discussion($forum, $fromform->groupid, -1, $cm, $modcontext)) {
-                error('Can not add discussion, sorry.');
+                print_error('cannotcreatediscussion', 'forum');
             }
             if (empty($fromform->groupid)) {
                 $fromform->groupid = -1;
@@ -717,7 +717,7 @@
 
     if ($post->discussion) {
         if (! $toppost = $DB->get_record("forum_posts", array("discussion" => $post->discussion, "parent" => 0))) {
-            error("Could not find top parent of post $post->id");
+            print_error("Could not find top parent of post $post->id");
         }
     } else {
         $toppost->subject = ($forum->type == "news") ? get_string("addanewtopic", "forum") :
@@ -761,10 +761,10 @@
 
 // checkup
     if (!empty($parent) && !forum_user_can_see_post($forum, $discussion, $post, null, $cm)) {
-        error("You cannot reply to this post");
+        print_error('cannotreply', 'forum');
     }
     if (empty($parent) && empty($edit) && !forum_user_can_post_discussion($forum, $groupid, -1, $cm, $modcontext)) {
-        error("You cannot start a new discussion in this forum");
+        print_error('cannotcreatediscussion', 'forum');
     }
 
     if ($forum->type == 'qanda'
@@ -778,7 +778,7 @@
 
     if (!empty($parent)) {
         if (! $discussion = $DB->get_record('forum_discussions', array('id' => $parent->discussion))) {
-            error('This post is not part of a discussion!');
+            print_error('notpartofdiscussion', 'forum');
         }
 
         forum_print_post($parent, $discussion, $forum, $cm, $course, false, false, false);
diff --git a/mod/forum/user.php b/mod/forum/user.php
index 68b4faf438..fadcc41fec 100644
--- a/mod/forum/user.php
+++ b/mod/forum/user.php
@@ -18,11 +18,11 @@
     }
 
     if (! $user = $DB->get_record("user", array("id" => $id))) {
-        error("User ID is incorrect");
+        print_error('invaliduserid');
     }
 
     if (! $course = $DB->get_record("course", array("id" => $course))) {
-        error("Course id is incorrect.");
+        print_error('invalidcourseid');
     }
 
     $syscontext = get_context_instance(CONTEXT_SYSTEM);
@@ -107,7 +107,7 @@
 
             if (!isset($discussions[$post->discussion])) {
                 if (! $discussion = $DB->get_record('forum_discussions', array('id' => $post->discussion))) {
-                    error('Discussion ID was incorrect');
+                    print_error('invaliddiscussionid', 'forum');
                 }
                 $discussions[$post->discussion] = $discussion;
             } else {
@@ -116,7 +116,7 @@
 
             if (!isset($forums[$discussion->forum])) {
                 if (! $forum = $DB->get_record('forum', array('id' => $discussion->forum))) {
-                    error("Could not find forum $discussion->forum");
+                    print_error('invalidforumid', 'forum');
                 }
                 $forums[$discussion->forum] = $forum;
             } else {
@@ -136,7 +136,7 @@
 
             if (!isset($cms[$forum->id])) {
                 if (!$cm = get_coursemodule_from_instance('forum', $forum->id)) {
-                    error('Course Module ID was incorrect');
+                    print_error('invalidcoursemodule');
                 }
                 $cms[$forum->id] = $cm;
                 unset($cm); // do not use cm directly, it would break caching