File Source for courses.php

<?php // $Id: courses.php 14406 2008-02-27 21:53:15Z yannoo $
/*
==============================================================================
Dokeos - elearning and course management software
Copyright (c) 2004 Dokeos S.A.
Copyright (c) 2003 Ghent University (UGent)
Copyright (c) 2001 Universite catholique de Louvain (UCL)
Copyright (c) various contributors
For a full list of contributors, see "credits.txt".
The full license can be read in "license.txt".
This program 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 2
of the License, or (at your option) any later version.
See the GNU General Public License for more details.
Contact: Dokeos, 181 rue Royale, B-1000 Brussels, Belgium, info@dokeos.com
==============================================================================
*/
/**
==============================================================================
* @package dokeos.auth
* @todo check if unsubscribing from a course WITH group memberships works as it should
* @todo constants are in uppercase, variables aren't
==============================================================================
*/
/*
==============================================================================
INIT SECTION
==============================================================================
*/
// name of the language file that needs to be included
$language_file = 'courses';
// including the global file
include('../inc/global.inc.php');
// section for the tabs
$this_section=SECTION_COURSES;
// acces rights: anonymous users can't do anything usefull here
api_block_anonymous_users();
// include additional libraries
include_once(api_get_path(LIBRARY_PATH) . 'debug.lib.inc.php');
include_once(api_get_path(LIBRARY_PATH) . 'course.lib.php');
$ctok = $_SESSION['sec_token'];
$stok = Security::get_token();
// Database table definitions
$tbl_course = Database::get_main_table(TABLE_MAIN_COURSE);
$tbl_courses_nodes = Database::get_main_table(TABLE_MAIN_CATEGORY);
$tbl_courseUser = Database::get_main_table(TABLE_MAIN_COURSE_USER);
$tbl_user = Database::get_main_table(TABLE_MAIN_USER);
//filter
$safe = array();
$safe['action'] = '';
$actions = array('sortmycourses','createcoursecategory','subscribe','deletecoursecategory','unsubscribe');
if(in_array(htmlentities($_GET['action']),$actions))
{
$safe['action'] = htmlentities($_GET['action']);
}
// title of the page
if ($safe['action'] == 'sortmycourses' OR !isset($safe['action']))
{
$nameTools = get_lang("SortMyCourses");
}
if ($safe['action'] == 'createcoursecategory')
{
$nameTools = get_lang('CreateCourseCategory');
}
if ($safe['action'] == 'subscribe')
{
$nameTools = get_lang("SubscribeToCourse");
}
// breadcrumbs
$interbreadcrumb[] = array('name'=> get_lang('CourseManagement'), 'url'=>'courses.php');
// Displaying the header
Display::display_header($nameTools);
/*
==============================================================================
COMMANDS SECTION
==============================================================================
*/
unset($message);
// we are moving a course or category of the user up/down the list (=Sort My Courses)
if (isset($_GET['move']))
{
if (isset($_GET['course']))
{
if($ctok == $_GET['sec_token'])
{
$message=move_course($_GET['move'], $_GET['course'],$_GET['category']);
}
}
if (isset($_GET['category']) and !$_GET['course'])
{
if($ctok == $_GET['sec_token'])
{
$message=move_category($_GET['move'], $_GET['category']);
}
}
}
// we are moving the course of the user to a different user defined course category (=Sort My Courses)
if (isset($_POST['submit_change_course_category']))
{
if($ctok == $_POST['sec_token'])
{
$message=store_changecoursecategory($_POST['course_2_edit_category'], $_POST['course_categories']);
}
}
// we are creating a new user defined course category (= Create Course Category)
if (isset($_POST['create_course_category']) AND isset($_POST['title_course_category']) AND strlen(trim($_POST['title_course_category'])) > 0)
{
if($ctok == $_POST['sec_token'])
{
$message=store_course_category();
}
}
if (isset($_POST['submit_edit_course_category']) AND isset($_POST['title_course_category']) AND strlen(trim($_POST['title_course_category'])) > 0)
{
if($ctok == $_POST['sec_token'])
{
$message=store_edit_course_category();
}
}
// we are subcribing to a course (=Subscribe to course)
if (isset($_POST['subscribe']))
{
if($ctok == $_POST['sec_token'])
{
$message = subscribe_user($_POST['subscribe']);
}
}
// we are unsubscribing from a course (=Unsubscribe from course)
if (isset($_POST['unsubscribe']))
{
if($ctok == $_POST['sec_token'])
{
$message=remove_user_from_course($_user['user_id'], $_POST['unsubscribe']);
}
}
// we are deleting a course category
if ($safe['action']=='deletecoursecategory' AND isset($_GET['id']))
{
if($ctok == $_GET['sec_token'])
{
$message=delete_course_category($_GET['id']);
}
}
/*
==============================================================================
DISPLAY SECTION
==============================================================================
*/
// Diplaying the tool title
// api_display_tool_title($nameTools);
// we are displaying any result messages;
if (isset($message))
{
Display::display_confirmation_message($message, false);
}
// The menu with the different options in the course management
echo "<div id=\"actions\">\n";
if ($safe['action'] <> 'sortmycourses' AND isset($safe['action']))
{
echo "<a href=\"".api_get_self()."?action=sortmycourses\">".Display::return_icon('deplacer_fichier.gif').' '.get_lang("SortMyCourses")."</a>";
}
else
{
echo '<b>'.Display::return_icon('deplacer_fichier.gif').' '.get_lang('SortMyCourses').'</b>';
}
echo '  ';
if ($safe['action']<>'createcoursecategory')
{
echo "<a href=\"".api_get_self()."?action=createcoursecategory\">".Display::return_icon('folder_new.gif').' '.get_lang("CreateCourseCategory")."</a>\n";
}
else
{
echo '<b>'.Display::return_icon('folder_new.gif').' '.get_lang('CreateCourseCategory').'</b>';
}
echo '  ';
if ($safe['action']<>'subscribe')
{
echo "\t\t<a href=\"".api_get_self()."?action=subscribe\">".Display::return_icon('view_more_stats.gif').' '.get_lang("SubscribeToCourse")."</a>\n";
}
else
{
echo '<b>'.Display::return_icon('view_more_stats.gif').' '.get_lang("SubscribeToCourse").'</b>';
}
echo "</div>";
echo "<div>";
switch ($safe['action'])
{
case 'subscribe':
//api_display_tool_title(get_lang('SubscribeToCourse'));
courses_subscribing();
break;
case 'unsubscribe':
//api_display_tool_title(get_lang('UnsubscribeFromCourse'));
$user_courses=get_courses_of_user($_user['user_id']);
display_courses($_user['user_id'], true, $user_courses);
break;
case 'createcoursecategory':
//api_display_tool_title(get_lang('CreateCourseCategory'));
display_create_course_category_form();
break;
case 'deletecoursecategory':
case 'sortmycourses':
default:
//api_display_tool_title(get_lang('SortMyCourses'));
$user_courses=get_courses_of_user($_user['user_id']);
display_courses($_user['user_id'], true, $user_courses);
break;
}
echo '</div>';
Display :: display_footer();
/*
==============================================================================
FUNCTIONS
==============================================================================
*/
/**
* Subscribe the user to a given course
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param string $course_code the code of the course the user wants to subscribe to
* @return string we return the message that is displayed when the action is succesfull
*/
function subscribe_user($course_code)
{
global $_user, $stok;
$all_course_information = CourseManager::get_course_information($course_code);
if ($all_course_information['registration_code']=='' OR $_POST['course_registration_code']==$all_course_information['registration_code'])
{
if (CourseManager::add_user_to_course($_user['user_id'], $course_code))
{
return get_lang('EnrollToCourseSuccessful');
}
else
{
return get_lang('ErrorContactPlatformAdmin');
}
}
else
{
$return='';
if (isset($_POST['course_registration_code']) AND $_POST['course_registration_code']<>$all_course_information['registration_code'])
{
Display::display_error_message(get_lang('CourseRegistrationCodeIncorrect'));
}
$return.=get_lang('CourseRequiresPassword').'<br/>';
$return.=$all_course_information['visual_code'].' - '.$all_course_information['title'];
$return.="<form action=\"".$_SERVER["REQUEST_URI"]."\" method=\"post\">";
$return.='<input type="hidden" name="sec_token" value="'.$stok.'" />';
$return.="<input type=\"hidden\" name=\"subscribe\" value=\"".$all_course_information['code']."\" />";
$return.="<input type=\"text\" name=\"course_registration_code\" value=\"".$_POST['course_registration_code']."\" />";
$return.="<input type=\"Submit\" name=\"submit_course_registration_code\" value=\"OK\" alt=\"".get_lang("SubmitRegistrationCode")."\" /></form>";
return $return;
}
}
/**
* unsubscribe the user from a given course
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param int $user_id The user id of the user that is performing the unsubscribe action
* @param string $course_code the course code of the course the user wants to unsubscribe from
* @return string we return the message that is displayed when the action is succesfull
*/
function remove_user_from_course($user_id, $course_code)
{
$tbl_course_user = Database::get_main_table(TABLE_MAIN_COURSE_USER);
// we check (once again) if the user is not course administrator
// because the course administrator cannot unsubscribe himself
// (s)he can only delete the course
$sql_check="SELECT * FROM $tbl_course_user WHERE user_id='".$user_id."' AND course_code='".$course_code."' AND status='1'";
$result_check=api_sql_query($sql_check,__FILE__,__LINE__);
$number_of_rows=Database::num_rows($result_check);
if ($number_of_rows>0)
{return false;}
else
{
CourseManager::unsubscribe_user($user_id,$course_code);
return get_lang("YouAreNowUnsubscribed");
}
}
/**
* handles the display of the courses to which the user can subscribe
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function courses_subscribing()
{
browse_courses();
display_search_courses();
}
/**
* Allows you to browse through the course categories (faculties) and subscribe to the courses of
* this category (faculty)
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function browse_courses()
{
browse_course_categories();
if (!isset($_POST['search_course']))
{
browse_courses_in_category();
}
}
/**
* Counts the number of courses in a given course category
*/
function count_courses_in_category($category)
{
$tbl_course = Database::get_main_table(TABLE_MAIN_COURSE);
$sql="SELECT * FROM $tbl_course WHERE category_code".(empty($category)?" IS NULL":"='".$category."'");
$result=api_sql_query($sql,__FILE__,__LINE__);
return Database::num_rows($result);
}
/**
* displays the browsing of the course categories (faculties)
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @return HTML code containing a list with all the categories and subcategories and the navigation to go one category up(if needed)
*/
function browse_course_categories()
{
global $stok;
$tbl_courses_nodes = Database::get_main_table(TABLE_MAIN_CATEGORY);
$category = Database::escape_string($_GET['category']);
$safe_url_categ = Security::remove_XSS($_GET['category']);
echo "<p><b>".get_lang('CourseCategories')."</b>";
$sql= "SELECT * FROM $tbl_courses_nodes WHERE parent_id ".(empty($category)?"IS NULL":"='".$category."'")." GROUP BY code, parent_id ORDER BY tree_pos ASC";
$result=api_sql_query($sql,__FILE__,__LINE__);
echo "<ul>";
while ($row=Database::fetch_array($result))
{
$count_courses_in_categ = count_courses_in_category($row['code']);
if ($row['children_count'] > 0 OR $count_courses_in_categ>0)
{
echo "<li><a href=\"".api_get_self()."?action=subscribe&category=".$row['code']."&up=".$safe_url_categ."&sec_token=".$stok."\">".$row['name']."</a>".
" (".$count_courses_in_categ.")</li>";
}
elseif ($row['nbChilds'] > 0)
{
echo "<li><a href=\"".api_get_self()."?action=subscribe&category=".$row['code']."&up=".$safe_url_categ."&sec_token=".$stok."\">".$row['name']."</a></li>";
}
else
{
echo "<li>".$row['name']."</li>";
}
}
echo "</ul>";
if ($_GET['category'])
{
echo "<a href=\"".api_get_self()."?action=subscribe&category=".Security::remove_XSS($_GET['up'])."&sec_token=".$stok."\">< ".get_lang('UpOneCategory')."</a>";
}
}
/**
* Display all the courses in the given course category. I could have used a parameter here
* but instead I use the already available $_GET['category']
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @return HTML code: a table with all the courses in a given category (title, code, tutor) and a subscription icon if applicable)
*/
function browse_courses_in_category()
{
$tbl_course = Database::get_main_table(TABLE_MAIN_COURSE);
$category = Database::escape_string($_GET['category']);
echo "<p><b>".get_lang('CoursesInCategory')."</b>";
$my_category = (empty($category)?" IS NULL":"='".$category."'");
$sql="SELECT * FROM $tbl_course WHERE category_code".$my_category.' ORDER BY title, visual_code';
$result=api_sql_query($sql,__FILE__,__LINE__);
while ($row=Database::fetch_array($result))
{
if ($row['registration_code']=='')
{
$registration_code=false;
}
else
{
$registration_code=true;
}
$courses[]=array("code" => $row['code'], "directory" => $row['directory'], "db"=> $row['db_name'], "visual_code" => $row['visual_code'], "title" => $row['title'], "tutor" => $row['tutor_name'], "subscribe" => $row['subscribe'], "unsubscribe" => $row['unsubscribe'], 'registration_code'=> $registration_code);
}
display_subscribe_to_courses($courses);
}
/**
* displays the form for searching for a course and the results if a query has been submitted.
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @return HTML code: the form for searching for a course
*/
function display_search_courses()
{
global $_user,$charset,$stok;
echo "<p><b>".get_lang("SearchCourse")."</b><br />";
echo "<form class=\"course_list\" method=\"post\" action=\"".api_get_self()."?action=subscribe\">",
'<input type="hidden" name="sec_token" value="'.$stok.'">',
"<input type=\"hidden\" name=\"search_course\" value=\"1\" />",
"<input type=\"text\" name=\"search_term\" value=\"".(empty($_POST['search_term'])?'':$_POST['search_term'])."\" />",
" <input type=\"submit\" value=\"",get_lang("_search"),"\" />",
"</form>";
if (isset($_POST['search_course']))
{
echo "<p><b>".get_lang("SearchResultsFor")." ".htmlentities($_POST['search_term'],ENT_QUOTES,$charset)."</b><br />";
$result_search_courses_array=search_courses($_POST['search_term']);
display_subscribe_to_courses($result_search_courses_array);
}
}
/**
* This function displays the list of course that can be subscribed to.
* This list can come from the search results or from the browsing of the platform course categories
*/
function display_subscribe_to_courses($courses)
{
global $_user;
// getting all the courses to which the user is subscribed to
$user_courses=get_courses_of_user($_user['user_id']);
$user_coursecodes=array();
// we need only the course codes as these will be used to match against the courses of the category
if ($user_courses<>"")
{
foreach ($user_courses as $key=>$value)
{
$user_coursecodes[]=$value['code'];
}
}
if ($courses==0)
{
return false;
}
echo "<table cellpadding=\"4\">\n";
foreach ($courses as $key=>$course)
{
// displaying the course title, visual code and teacher/teaching staff
echo "\t<tr>\n";
echo "\t\t<td>\n";
echo "<b>".$course['title']."</b><br />";
if (get_setting("display_coursecode_in_courselist") == "true")
{
echo $course['visual_code'];
}
if (get_setting("display_coursecode_in_courselist") == "true" AND get_setting("display_teacher_in_courselist") == "true")
{
echo " - ";
}
if (get_setting("display_teacher_in_courselist") == "true")
{
echo $course['tutor'];
}
echo "\t\t</td>\n";
echo "\t\t<td>\n";
if ($course['registration_code'])
{
Display::display_icon('passwordprotected.png','',array('style'=>'float:left;'));
}
display_subscribe_icon($course, $user_coursecodes);
echo "\t\t</td>\n";
echo "</tr>";
}
echo "</table>";
}
/**
* Search the courses database for a course that matches the search term.
* The search is done on the code, title and tutor field of the course table.
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param string $search_term: the string that the user submitted, what we are looking for
* @return array an array containing a list of all the courses (the code, directory, dabase, visual_code, title, ... )
* matching the the search term.
*/
function search_courses($search_term)
{
$TABLECOURS = Database::get_main_table(TABLE_MAIN_COURSE);
$search_term_safe=Database::escape_string($search_term);
$sql_find="SELECT * FROM $TABLECOURS WHERE code LIKE '%".$search_term_safe."%' OR title LIKE '%".$search_term_safe."%' OR tutor_name LIKE '%".$search_term_safe."%' ORDER BY title, visual_code ASC";
$result_find=api_sql_query($sql_find,__FILE__,__LINE__);
while ($row=Database::fetch_array($result_find))
{
$courses[]=array("code" => $row['code'], "directory" => $row['directory'], "db"=> $row['db_name'], "visual_code" => $row['visual_code'], "title" => $row['title'], "tutor" => $row['tutor_name'], "subscribe" => $row['subscribe'], "unsubscribe" => $row['unsubscribe']);
}
return $courses;
}
/**
* deletes a course category and moves all the courses that were in this category to main category
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param int $id: the id of the user_course_category
* @return string a language variable saying that the deletion went OK.
*/
function delete_course_category($id)
{
global $_user, $_configuration;
$tucc = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
$TABLECOURSUSER=Database::get_main_table(TABLE_MAIN_COURSE_USER);
$id = intval($id);
$sql_delete="DELETE FROM $tucc WHERE id='".$id."' and user_id='".$_user['user_id']."'";
$sql_update="UPDATE $TABLECOURSUSER SET user_course_cat='0' WHERE user_course_cat='".$id."' AND user_id='".$_user['user_id']."'";
api_sql_query($sql_delete,__FILE__,__LINE__);
api_sql_query($sql_update,__FILE__,__LINE__);
return get_lang("CourseCategoryDeleted");
}
/**
* stores the user course category in the dokeos_user database
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @return string a language variable saying that the user course category was stored
*/
function store_course_category()
{
global $_user, $_configuration, $charset;
$tucc = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
// step 1: we determine the max value of the user defined course categories
$sql="SELECT sort FROM $tucc WHERE user_id='".$_user['user_id']."' ORDER BY sort DESC";
$result=api_sql_query($sql,__FILE__,__LINE__);
$maxsort=Database::fetch_array($result);
$nextsort=$maxsort['sort']+1;
// step 2: we check if there is already a category with this name, if not we store it, else we give an error.
$sql="SELECT * FROM $tucc WHERE user_id='".$_user['user_id']."' AND title='".Database::escape_string($_POST['title_course_category'])."'ORDER BY sort DESC";
$result=api_sql_query($sql,__FILE__,__LINE__);
if (Database::num_rows($result) == 0)
{
$sql_insert="INSERT INTO $tucc (user_id, title,sort) VALUES ('".$_user['user_id']."', '".htmlentities($_POST['title_course_category'],ENT_QUOTES,$charset)."', '".$nextsort."')";
api_sql_query($sql_insert,__FILE__,__LINE__);
Display::display_confirmation_message(get_lang("CourseCategoryStored"));
}
else
{
Display::display_error_message(get_lang('ACourseCategoryWithThisNameAlreadyExists'));
}
}
/**
* displays the form that is needed to create a course category.
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @return HTML the form (input field + submit button) to create a user course category
*/
function display_create_course_category_form()
{
global $_user, $_configuration,$stok;
echo "<form name=\"create_course_category\" method=\"post\" action=\"".api_get_self()."?action=sortmycourses\">\n";
echo '<input type="hidden" name="sec_token" value="'.$stok.'">';
echo "<input type=\"text\" name=\"title_course_category\" />\n";
echo "<input type=\"submit\" name=\"create_course_category\" value=\"".get_lang("Ok")."\" />\n";
echo "</form>\n";
echo get_lang("ExistingCourseCategories");
$tucc = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
$sql="SELECT * FROM $tucc WHERE user_id='".$_user['user_id']."'";
$result=api_sql_query($sql, __LINE__, __FILE__);
if (Database::num_rows($result)>0)
{
echo "<ul>\n";
while ($row=Database::fetch_array($result))
{
echo "\t<li>".$row['title']."</li>\n";
}
echo "</ul>\n";
}
}
// ***************************************************************************
// this function stores the changes in a course category
//
// ***************************************************************************
/**
* stores the changes in a course category (moving a course to a different course category)
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param string $course_code : the course_code of the course we are moving
* int $newcategory : the id of the user course category we are moving the course to.
* @return string a language variable saying that the course was moved.
*/
function store_changecoursecategory($course_code, $newcategory)
{
global $_user;
$course_code = Database::escape_string($course_code);
$newcategory = Database::escape_string($newcategory);
$TABLECOURSUSER = Database::get_main_table(TABLE_MAIN_COURSE_USER);
$max_sort_value=api_max_sort_value($newcategory,$_user['user_id']); //max_sort_value($newcategory);
$sql="UPDATE $TABLECOURSUSER SET user_course_cat='".$newcategory."', sort='".($max_sort_value+1)."' WHERE course_code='".$course_code."' AND user_id='".$_user['user_id']."'";
$result=api_sql_query($sql,__FILE__,__LINE__);
return get_lang("EditCourseCategorySucces");
}
/**
* moves the course one place up or down
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param string $direction : the direction we are moving the course to (up or down)
* string $course2move : the course we are moving
* @return string a language variable saying that the course was moved.
*/
function move_course($direction, $course2move, $category)
{
global $_user;
$TABLECOURSUSER = Database::get_main_table(TABLE_MAIN_COURSE_USER);
$all_user_courses=get_courses_of_user($_user['user_id']);
// we need only the courses of the category we are moving in
$user_courses = array();
foreach ($all_user_courses as $key=>$course)
{
if ($course['user_course_category']==$category)
{
$user_courses[]=$course;
}
}
foreach ($user_courses as $key=>$course)
{
if ($course2move==$course['code'])
{
// source_course is the course where we clicked the up or down icon
$source_course=$course;
// target_course is the course before/after the source_course (depending on the up/down icon)
if ($direction=="up")
{$target_course=$user_courses[$key-1];}
else
{$target_course=$user_courses[$key+1];}
} // if ($course2move==$course['code'])
}
if(count($target_course)>0 && count($source_course)>0)
{
$sql_update1="UPDATE $TABLECOURSUSER SET sort='".$target_course['sort']."' WHERE course_code='".$source_course['code']."' AND user_id='".$_user['user_id']."'";
$sql_update2="UPDATE $TABLECOURSUSER SET sort='".$source_course['sort']."' WHERE course_code='".$target_course['code']."' AND user_id='".$_user['user_id']."'";
api_sql_query($sql_update2,__FILE__,__LINE__);
api_sql_query($sql_update1,__FILE__,__LINE__);
return get_lang("CourseSortingDone");
}
return '';
}
/**
* Moves the course one place up or down
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param string $direction : the direction we are moving the course to (up or down)
* string $course2move : the course we are moving
* @return string a language variable saying that the course was moved.
*/
function move_category($direction, $category2move)
{
global $_user;
// the database definition of the table that stores the user defined course categories
$table_user_defined_category = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
$user_coursecategories=get_user_course_categories();
$user_course_categories_info = get_user_course_categories_info();
foreach ($user_coursecategories as $key=>$category_id)
{
if ($category2move==$category_id)
{
// source_course is the course where we clicked the up or down icon
//$source_category=get_user_course_category($category2move);
$source_category = $user_course_categories_info[$category2move];
// target_course is the course before/after the source_course (depending on the up/down icon)
if ($direction=="up")
{
$target_category=$user_course_categories_info[$user_coursecategories[$key-1]];
}
else
{
$target_category=$user_course_categories_info[$user_coursecategories[$key+1]];
}
} // if ($course2move==$course['code'])
} // foreach ($user_courses as $key=>$course)
if(count($target_category)>0 && count($source_category)>0)
{
$sql_update1="UPDATE $table_user_defined_category SET sort='".$target_category['sort']."' WHERE id='".$source_category['id']."' AND user_id='".$_user['user_id']."'";
$sql_update2="UPDATE $table_user_defined_category SET sort='".$source_category['sort']."' WHERE id='".$target_category['id']."' AND user_id='".$_user['user_id']."'";
api_sql_query($sql_update2,__FILE__,__LINE__);
api_sql_query($sql_update1,__FILE__,__LINE__);
return get_lang("CategorySortingDone");
}
return '';
}
/**
* displays everything that is needed when the user wants to manage his current courses (sorting, subscribing, unsubscribing, ...)
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param int $user_id: the user_id of the current user
* string $parameter: determines weither we are displaying for the sorting, subscribing or unsubscribin
array $user_courses: the courses to which the user is subscribed
* @return html a table containing courses and the appropriate icons (sub/unsub/move)
*/
function display_courses($user_id, $show_course_icons, $user_courses)
{
global $_user, $_configuration;
echo "<table cellpadding=\"4\">\n";
// building an array that contains all the id's of the user defined course categories
// initially this was inside the display_courses_in_category function but when we do it here we have fewer
// sql executions = performance increase.
$all_user_categories=get_user_course_categories();
// step 0: we display the course without a user category
display_courses_in_category(0,'true');
// Step 1: we get all the categories of the user
$tucc = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
$sql="SELECT * FROM $tucc WHERE user_id='".$_user['user_id']."' ORDER BY sort ASC";
$result=api_sql_query($sql,__FILE__,__LINE__);
while ($row=Database::fetch_array($result))
{
if ($show_course_icons=true)
{
// the edit link is clicked: we display the edit form for the category
if (isset($_GET['categoryid']) AND $_GET['categoryid']==$row['id'])
{
echo "<tr><td colspan=\"2\" class=\"user_course_category\">";
echo '<a name="category'.$row['id'].'"></a>'; // display an internal anchor.
display_edit_course_category_form($row['id']);
}
// we simply display the title of the catgory
else
{
echo "<tr><td colspan=\"2\" class=\"user_course_category\">";
echo '<a name="category'.$row['id'].'"></a>'; // display an internal anchor.
echo $row['title'];
}
echo "</td><td class=\"user_course_category\">";
display_category_icons($row['id'],$all_user_categories);
echo "</td></tr>";
}
// Step 2: show the courses inside this category
display_courses_in_category($row['id'], $show_course_icons);
}
echo "</table>\n";
}
/**
* This function displays all the courses in the particular user category;
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param int id: the id of the user defined course category
* @return string: the name of the user defined course category
*/
function display_courses_in_category($user_category_id, $showicons)
{
global $_user;
// table definitions
$TABLECOURS=Database::get_main_table(TABLE_MAIN_COURSE);
$TABLECOURSUSER=Database::get_main_table(TABLE_MAIN_COURSE_USER);
$TABLE_USER_COURSE_CATEGORY = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
$sql_select_courses="SELECT course.code, course.visual_code, course.subscribe subscr, course.unsubscribe unsubscr,
course.title title, course.tutor_name tutor, course.db_name, course.directory, course_rel_user.status status,
course_rel_user.sort sort, course_rel_user.user_course_cat user_course_cat
FROM $TABLECOURS course,
$TABLECOURSUSER course_rel_user
WHERE course.code = course_rel_user.course_code
AND course_rel_user.user_id = '".$_user['user_id']."'
AND course_rel_user.user_course_cat='".$user_category_id."'
ORDER BY course_rel_user.user_course_cat, course_rel_user.sort ASC";
$result = api_sql_query($sql_select_courses,__FILE__,__LINE__);
$number_of_courses=Database::num_rows($result);
$key=0;
while ($course=Database::fetch_array($result))
{
echo "\t<tr>\n";
echo "\t\t<td>\n";
echo '<a name="course'.$course['code'].'"></a>'; // display an internal anchor.
echo "<b>".$course['title']."</b><br />";
if (get_setting("display_coursecode_in_courselist") == "true")
{
echo $course['visual_code'];
}
if (get_setting("display_coursecode_in_courselist") == "true" AND get_setting("display_teacher_in_courselist") == "true")
{
echo " - ";
}
if (get_setting("display_teacher_in_courselist") == "true")
{
echo $course['tutor'];
}
echo "\t\t</td>\n";
// displaying the up/down/edit icons when we are sorting courses
echo "\t\t<td valign=\"top\">\n";
//if ($parameter=="sorting")
//{
display_course_icons($key, $number_of_courses, $course);
//}
// displaying the delete icon when we are unsubscribing from courses
//if($parameter=="deleting")
//{
// display_unsubscribe_icons($course);
//}
// display the subscribing icon when we are to courses.
//if ($parameter=="subscribing")
//{
// display_subscribe_icon($course);
//}
echo "\t\t</td>\n";
echo "\t</tr>\n";
$key++;
}
}
/**
* gets the title of the user course category
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param int id: the id of the user defined course category
* @return string: the name of the user defined course category
*/
function get_user_course_category($id)
{
global $_user, $_configuration;
$tucc = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
$id = intval($id);
$sql="SELECT * FROM $tucc WHERE user_id='".$_user['user_id']."' AND id='$id'";
$result=api_sql_query($sql,__FILE__,__LINE__);
$row=Database::fetch_array($result);
return $row;
}
/**
* displays the subscribe icon if the subscribing is allowed and if the user is not yet
* subscribe to this course
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param string $current_course: the course code of the course we need to display the subscribe icon for
* @return string a subscribe icon or the text that subscribing is not allowed or the user is already subscribed
*/
function display_subscribe_icon($current_course, $user_coursecodes)
{
global $stok;
// we display the icon to subscribe or the text already subscribed
if (in_array($current_course['code'],$user_coursecodes))
{
echo get_lang("AlreadySubscribed");
}
else
{
if ($current_course['subscribe'] == SUBSCRIBE_ALLOWED)
{
echo "<form action=\"".$_SERVER["REQUEST_URI"]."\" method=\"post\">";
echo '<input type="hidden" name="sec_token" value="'.$stok.'">';
echo "<input type=\"hidden\" name=\"subscribe\" value=\"".$current_course['code']."\" />";
if(!empty($_POST['search_term']))
{
echo '<input type="hidden" name="search_course" value="1" />';
echo '<input type="hidden" name="search_term" value="'.Security::remove_XSS($_POST['search_term']).'" />';
}
echo "<input type=\"image\" name=\"unsub\" src=\"../img/enroll.gif\" alt=\"".get_lang("Subscribe")."\" />".get_lang("Subscribe")."</form>";
}
else
{
echo get_lang("SubscribingNotAllowed");
}
}
}
/**
* Displays the subscribe icon if the subscribing is allowed and if the user is not yet
* subscribed to this course
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param $key:
* $number_of_courses
* $course
* $user_courses
* @return html a small table containing the up/down icons and the edit icon (for moving to a different user course category)
* @todo complete the comments on this function: the parameter section
*/
function display_course_icons($key, $number_of_courses, $course)
{
//print_r($course);
global $safe,$charset,$stok;
echo "<table><tr><td>";
// the up icon
if ($key>0)
{
echo "<a href=\"courses.php?action=".$safe['action']."&move=up&course=".$course['code']."&category=".$course['user_course_cat']."&sec_token=".$stok."\">";
Display::display_icon('up.gif', get_lang('Up'));
echo '</a>';
}
echo "</td>";
// the edit icon OR the edit dropdown list
if (isset($_GET['edit']) and $course['code']==$_GET['edit'])
{
echo "<td rowspan=\"2\" valign=\"top\">".display_change_course_category_form($_GET['edit'])."</td>";
}
else
{
echo "<td rowspan=\"2\" valign=\"middle\"><a href=\"courses.php?action=".$safe['action']."&edit=".$course['code']."&sec_token=".$stok."\">";
Display::display_icon('edit.gif',get_lang('Edit'));
echo "</a></td>";
}
echo "<td rowspan=\"2\" valign=\"top\" class=\"invisible\">";
if ($course['status'] != 1)
{
if ($course['unsubscr'] == 1)
{ // changed link to submit to avoid action by the search tool indexer
echo "<form action=\"".api_get_self()."\" method=\"post\" onsubmit=\"javascript:if(!confirm('".addslashes(htmlentities(get_lang("ConfirmUnsubscribeFromCourse"),ENT_QUOTES,$charset))."')) return false;\">";
echo '<input type="hidden" name="sec_token" value="'.$stok.'">';
echo "<input type=\"hidden\" name=\"unsubscribe\" value=\"".$course['code']."\" />";
echo "<input type=\"image\" name=\"unsub\" src=\"../img/delete.gif\" alt=\"".get_lang("_unsubscribe")."\" /></form>";
}
else
{display_info_text(get_lang("UnsubscribeNotAllowed"));}
}
else
{
display_info_text(get_lang("CourseAdminUnsubscribeNotAllowed"));
}
echo "</td>";
echo "</tr><tr><td>";
if ($key<$number_of_courses-1)
{
echo "<a href=\"courses.php?action=".$safe['action']."&move=down&course=".$course['code']."&category=".$course['user_course_cat']."&sec_token=".$stok."\">";
Display::display_icon('down.gif', get_lang('Down'));
echo '</a>';
}
echo "</td></tr></table>";
}
/**
* displays the relevant icons for the category (if applicable):move up, move down, edit, delete
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param $current_category the id of the current category
* $allcategories an associative array containing all the categories.
* @return html: a small table containing the up/down icons and the edit icon (for moving to a different user course category)
* @todo complete the comments on this function: the parameter section
*/
function display_category_icons($current_category, $all_user_categories)
{
global $safe,$charset,$stok;
$max_category_key=count($all_user_categories);
if ($safe['action']<>'unsubscribe') // we are in the unsubscribe section then we do not show the icons.
{
echo "<table>";
echo "<tr>";
echo "<td>";
if ($current_category<>$all_user_categories[0])
{
echo "<a href=\"courses.php?action=".$safe['action']."&move=up&category=".$current_category."&sec_token=".$stok."\">";
echo "<img src=\"../img/up.gif\" alt=\"".htmlentities(get_lang("Up"),ENT_QUOTES,$charset)."\"></a>";
}
echo "</td>";
echo " <td rowspan=\"2\">";
echo " <a href=\"courses.php?action=sortmycourses&categoryid=".$current_category."&sec_token=".$stok."#category".$current_category."\">";
Display::display_icon('edit.gif',get_lang('Edit'));
echo "</a>";
echo "</td>";
echo "<td rowspan=\"2\">";
echo " <a href=\"courses.php?action=deletecoursecategory&id=".$current_category."&sec_token=".$stok."\">";
Display::display_icon('delete.gif',get_lang('Edit'),array('onclick'=>"javascript:if(!confirm('".addslashes(htmlentities(get_lang("CourseCategoryAbout2bedeleted"),ENT_QUOTES,$charset))."')) return false;"));
echo "</a>";
echo "</td>";
echo "</tr>";
echo "<tr>";
echo " <td>";
if ($current_category<>$all_user_categories[$max_category_key-1])
{
echo "<a href=\"courses.php?action=".$safe['action']."&move=down&category=".$current_category."&sec_token=".$stok."\">";
echo "<img src=\"../img/down.gif\" alt=\"".htmlentities(get_lang("Down"),ENT_QUOTES,$charset)."\"></a>";
}
echo "</td>";
echo " </tr>";
echo "</table>";
}
}
/**
* This function displays the form (dropdown list) to move a course to a
* different course_category (after the edit icon has been changed)
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param string $edit_course:
* @return html a dropdown list containing all the user defined course categories and a submit button
* @todo when editing (moving) a course inside a user defined course category to a different user defined category
* the dropdown list should have the current course category selected.
*/
function display_change_course_category_form($edit_course)
{
global $_user, $_configuration, $safe, $stok;
$edit_course = Security::remove_XSS($edit_course);
$DATABASE_USER_TOOLS = $_configuration['user_personal_database'];
$tucc = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
$sql="SELECT * FROM $tucc WHERE user_id='".$_user['user_id']."'";
$result=api_sql_query($sql,__FILE__,__LINE__);
$output="<form name=\"edit_course_category\" method=\"post\" action=\"courses.php?action=".$safe['action']."\">\n";
$output.= '<input type="hidden" name="sec_token" value="'.$stok.'">';
$output.="<input type=\"hidden\" name=\"course_2_edit_category\" value=\"".$edit_course."\" />";
$output.="\t<select name=\"course_categories\">\n";
$output.="\t\t<option value=\"0\">".get_lang("NoCourseCategory")."</option>";
while ($row=Database::fetch_array($result))
{$output.="\t\t<option value=\"".$row['id']."\">".$row['title']."</option>";}
$output.="\t</select>\n";
$output.="\t<input type=\"submit\" name=\"submit_change_course_category\" value=\"".get_lang("Ok")."\" />\n";
$output.="</form>";
return $output;
}
/**
* This function displays the unsubscribe part which can be
* 1. the unsubscribe link
* 2. text: you are course admin of this course (=> unsubscription is not possible
* 3. text: you are not allowed to unsubscribe from this course
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param array $course: the array with all the course & course_rel_user information
* @return html a delete icon or a text that unsubscribing is not possible (course admin) or not allowed.
*/
function display_unsubscribe_icons($course)
{
global $charset, $stok;
if ($course['status'] != 1)
{
if ($course['unsubscribe'] == 1)
{ // changed link to submit to avoid action by the search tool indexer
echo "<form action=\"".api_get_self()."\" method=\"post\" onsubmit=\"javascript:if(!confirm('".addslashes(htmlentities(get_lang("ConfirmUnsubscribeFromCourse"),ENT_QUOTES,$charset))."')) return false;\">";
echo '<input type="hidden" name="sec_token" value="'.$stok.'">';
echo "<input type=\"hidden\" name=\"unsubscribe\" value=\"".$course['code']."\" />";
echo "<input type=\"image\" name=\"unsub\" src=\"../img/delete.gif\" alt=\"".get_lang("_unsubscribe")."\" /></form>";
}
else
{display_info_text(get_lang("UnsubscribeNotAllowed"));}
}
else
{
display_info_text(get_lang("CourseAdminUnsubscribeNotAllowed"));
}
}
/**
* retrieves all the courses that the user has already subscribed to
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param int $user_id: the id of the user
* @return array an array containing all the information of the courses of the given user
*/
function get_courses_of_user($user_id)
{
$TABLECOURS=Database::get_main_table(TABLE_MAIN_COURSE);
$TABLECOURSUSER=Database::get_main_table(TABLE_MAIN_COURSE_USER);
// Secondly we select the courses that are in a category (user_course_cat<>0) and sort these according to the sort of the category
$user_id = intval($user_id);
$sql_select_courses="SELECT course.code k, course.visual_code vc, course.subscribe subscr, course.unsubscribe unsubscr,
course.title i, course.tutor_name t, course.db_name db, course.directory dir, course_rel_user.status status,
course_rel_user.sort sort, course_rel_user.user_course_cat user_course_cat
FROM $TABLECOURS course,
$TABLECOURSUSER course_rel_user
WHERE course.code = course_rel_user.course_code
AND course_rel_user.user_id = '".$user_id."'
ORDER BY course_rel_user.sort ASC";
$result = api_sql_query($sql_select_courses,__FILE__,__LINE__);
while ($row=Database::fetch_array($result))
{
// we only need the database name of the course
$courses[]=array("db"=> $row['db'], "code" => $row['k'], "visual_code" => $row['vc'], "title" => $row['i'], "directory" => $row['dir'], "status" => $row['status'], "tutor" => $row['t'], "subscribe" => $row['subscr'], "unsubscribe" => $row['unsubscr'], "sort" => $row['sort'], "user_course_category" => $row['user_course_cat']);
}
return $courses;
}
/**
* retrieves the user defined course categories
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @return array containing all the IDs of the user defined courses categories, sorted by the "sort" field
*/
function get_user_course_categories()
{
global $_user;
$table_category = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
$sql = "SELECT * FROM ".$table_category." WHERE user_id='".$_user['user_id']."' ORDER BY sort ASC";
$result = api_sql_query($sql,__FILE__,__LINE__);
while ($row = Database::fetch_array($result))
{
$output[] = $row['id'];
}
return $output;
}
/**
* Retrieves the user defined course categories and all the info that goes with it
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @return array containing all the info of the user defined courses categories with the id as key of the array
*/
function get_user_course_categories_info()
{
global $_user;
$table_category = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
$sql = "SELECT * FROM ".$table_category." WHERE user_id='".$_user['user_id']."' ORDER BY sort ASC";
$result = api_sql_query($sql,__FILE__,__LINE__);
while ($row = Database::fetch_array($result))
{
$output[$row['id']] = $row;
}
return $output;
}
/**
* @author unknown
* @param string $text: the text that has to be written in grey
* @return string: the text with the grey formatting
* @todo move this to a stylesheet
* Added id grey to CSS
*/
function display_info_text($text)
{
//echo "<font color=\"#808080\">" . $text . "</font>\n";
echo $text;
}
/**
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param string $edit_course:
* @return html output: the form
*/
function display_edit_course_category_form($edit_course_category)
{
global $safe, $stok;
echo "<form name=\"edit_course_category\" method=\"post\" action=\"courses.php?action=".$safe['action']."\">\n";
echo "\t<input type=\"hidden\" name=\"edit_course_category\" value=\"".$edit_course_category."\" />\n";
echo '<input type="hidden" name="sec_token" value="'.$stok.'">';
$info_this_user_course_category=get_user_course_category($edit_course_category);
echo "\t<input type=\"text\" name=\"title_course_category\" value=\"".$info_this_user_course_category['title']."\" />";
echo "\t<input type=\"submit\" name=\"submit_edit_course_category\" value=\"".get_lang("Ok")."\" />\n";
echo "</form>";
}
/**
* Updates the user course category in the dokeos_user database
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @return string a language variable saying that the user course category was stored
*/
function store_edit_course_category()
{
global $_user, $_configuration, $charset;
$tucc = Database::get_user_personal_table(TABLE_USER_COURSE_CATEGORY);
$sql_update="UPDATE $tucc SET title='".htmlentities($_POST['title_course_category'],ENT_QUOTES,$charset)."' WHERE id='".(int)$_POST['edit_course_category']."'";
api_sql_query($sql_update,__FILE__,__LINE__);
return get_lang("CourseCategoryEditStored");
}
?>

Source for file courses.php