Show courses.php syntax highlighted
<?php // $Id: courses.php 445 2006-09-25 12:50:17Z evie_em $
/*
==============================================================================
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
==============================================================================
*/
// including the relevant language file
$langFile = array("courses", "curriculum");
// including the global file
include('../inc/claro_init_global.inc.php');
api_block_anonymous_users();
/*
-----------------------------------------------------------
Libraries
-----------------------------------------------------------
*/
include_once(api_get_library_path() . "/debug.lib.inc.php");
include_once(api_get_library_path() . "/course.lib.php");
/*
-----------------------------------------------------------
Variables
-----------------------------------------------------------
*/
$tbl_course = Database::get_main_table(MAIN_COURSE_TABLE);
$tbl_courses_nodes = Database::get_main_table(MAIN_CATEGORY_TABLE);
$tbl_courseUser = Database::get_main_table(MAIN_COURSE_USER_TABLE);
$tbl_user = Database::get_main_table(MAIN_USER_TABLE);
/*
-----------------------------------------------------------
Header
-----------------------------------------------------------
*/
// title of the page
$nameTools= get_lang("CourseManagement");
// the breadcrumbs
//$interbredcrump[]=array("url" => $_SERVER['PHP_SELF'],"name" => get_lang("CourseManagement"));
Display::display_header($nameTools);
api_display_tool_title($nameTools);
//VUB specific
Display::display_normal_message(get_lang("EnrollingCoursesNoAdministrativeConsequences"));
/*
==============================================================================
COMMANDS SECTION
==============================================================================
*/
$userId = $_uid;
unset($message);
// we are moving a course of the user up/down the list (=Sort My Courses)
if (isset($_GET['move']))
{
$message=move_course($_GET['move'], $_GET['course']);
}
// we are moving the course of the user to a different user defined course category (=Sort My Courses)
if (isset($_POST['submit_edit_course_category']))
{
$message=store_editcoursecategory($_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($_POST['title_course_category']) && strlen(trim($_POST['title_course_category'])) > 0)
{
$message=store_course_category();
}
// we are subcribing to a course (=Subscribe to course)
if (isset($_POST['subscribe']))
{
$message=subscribe_user($_POST['subscribe']);
}
// we are unsubscribing from a course (=Unsubscribe from course)
if (isset($_POST['unsubscribe']))
{
$message=remove_user_from_course($_uid, $_POST['unsubscribe']);
}
// we are displaying any result messages;
if (isset($message))
{
Display::display_normal_message($message);
}
/*
==============================================================================
DISPLAY SECTION
==============================================================================
*/
// The menu with the different options in the course management
echo "<div>\n";
echo "\t<ul>\n";
echo "\t\t<li><a href=\"".$_SERVER['PHP_SELF']."?action=sortmycourses\">".get_lang("SortMyCourses")."</a></li>\n";
echo "\t\t<li><a href=\"".$_SERVER['PHP_SELF']."?action=createcoursecategory\">".get_lang("CreateCourseCategory")."</a></li>\n";
echo "\t\t<li><a href=\"".$_SERVER['PHP_SELF']."?action=subscribe\">".get_lang("SubscribeToCourse")."</a></li>\n";
echo "\t\t<li><a href=\"".$_SERVER['PHP_SELF']."?action=unsubscribe\">".get_lang("UnsubscribeFromCourse")."</a></li>\n";
echo "\t</ul>\n";
echo "</div>";
echo "<div>";
switch ($_GET["action"])
{
case "sortmycourses":
api_display_tool_title(get_lang("SortMyCourses"));
$user_courses=get_courses_of_user($_uid);
display_courses($_uid, "sorting", $user_courses);
break;
case "subscribe":
api_display_tool_title(get_lang("SubscribeToCourse"));
courses_subscribing();
break;
case "unsubscribe":
api_display_tool_title(get_lang("UnsubscribeFromCourse"));
$user_courses=get_courses_of_user($_uid);
display_courses($_uid, "deleting", $user_courses);
break;
case "createcoursecategory":
api_display_tool_title(get_lang("CreateCourseCategory"));
display_create_course_category_form();
break;
case "deletecoursecategory";
if (isset($_GET['id']))
{ delete_course_category($_GET['id']);}
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 $_uid;
$tbl_course_user = Database::get_main_table(MAIN_COURSE_USER_TABLE);
//step 1: we find the largest value for sort in the main category(where user_course_cat=0
$max_sort=max_sort_value('0');
//step 2: we add it to the course_rel_user table
$sql_insert="INSERT INTO $tbl_course_user (course_code, user_id, status, sort, user_course_cat) VALUES ('".$course_code."', '".$_uid."', '5', '".($max_sort+1)."', '0')";
$result=mysql_query($sql_insert) or die(mysql_error());
return get_lang("EnrollToCourseSuccessful");
}
/**
* 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(MAIN_COURSE_USER_TABLE);
// 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);
$number_of_rows=mysql_num_rows($result_check);
if ($number_of_rows>0)
{return false;}
else
{
$sql_delete="DELETE FROM $tbl_course_user WHERE user_id='".$user_id."' AND course_code='".$course_code."'";
$result_delete=api_sql_query($sql_delete);
$removed_from_groups=remove_user_from_course_groups($user_id, $course_code);
if ($removed_from_groups)
{ return get_lang("YouAreNowUnsubscribed"); }
}
}
/**
* unsubscribe the user from all the groups in 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 $course_code the course code of the course the user wants to unsubscribe from
* @return string we return the message that is displayed when the action is succesfull
*/
function remove_user_from_course_groups($user_id, $course_code)
{
// step 1: we look up the database name of the course
$tbl_course = Database::get_main_table(MAIN_COURSE_TABLE);
$sql_findcourse="SELECT * FROM $tbl_course WHERE code='".$course_code."'";
$result_findcourse=api_sql_query($sql_findcourse);
$course=mysql_fetch_array($result_findcourse);
// step 2: we delete the user from the groups
$tbl_coursegroups=Database::get_course_group_user_table($course['db_name']);
$sql_delete="DELETE FROM $tbl_coursegroups WHERE user_id='".$user_id."'";
api_sql_query($sql_delete,__FILE__,__LINE__);
return true;
}
/**
* handles the display of the courses to which the user can subscribe
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function courses_subscribing()
{
browse_courses();
display_search_courses();
}
/**
* allows you to browse through the course categories (faculties) and subscribe to the courses of
* this category (faculty)
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function browse_courses()
{
browse_course_categories();
if (!isset($_POST['search_course']))
{
display_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(MAIN_COURSE_TABLE);
$sql="SELECT * FROM $tbl_course WHERE category_code".(empty($category)?" IS NULL":"='".$category."'");
$result=api_sql_query($sql);
return mysql_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()
{
$tbl_courses_nodes = Database::get_main_table(MAIN_CATEGORY_TABLE);
echo "<p><b>".get_lang('CourseCategories')."</b>";
$sql= "SELECT * FROM $tbl_courses_nodes WHERE parent_id ".(empty($_GET['category'])?"IS NULL":"='".$_GET['category']."'")." GROUP BY code, parent_id ORDER BY tree_pos ASC";
$result=mysql_query($sql);
echo "<ul>";
while ($row=mysql_fetch_array($result))
{
if ($row['children_count'] > 0 OR count_courses_in_category($row['code'])>0)
{
echo "<li><a href=\"".$_SERVER['PHP_SELF']."?action=subscribe&category=".$row['code']."&up=".$_GET['category']."\">".$row['name']."</a>".
" (".count_courses_in_category($row['code']).")</li>";
}
elseif ($row['nbChilds'] > 0)
{
echo "<li><a href=\"".$_SERVER['PHP_SELF']."?action=subscribe&category=".$row['code']."&up=".$_GET['category']."\">".$row['name']."</a></li>";
}
else
{
echo "<li>".$row['name']."</li>";
}
}
echo "</ul>";
if ($_GET['category'])
{
echo "<a href=\"".$_SERVER['PHP_SELF']."?action=subscribe&category=".$_GET['up']."\">< ".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 display_courses_in_category()
{
$category = $_GET['category'];
$tbl_course = Database::get_main_table(MAIN_COURSE_TABLE);
echo "<p><b>".get_lang('CoursesInCategory')."</b>";
$sql="SELECT * FROM $tbl_course WHERE category_code".(empty($category)?" IS NULL":"='".$_GET['category']."'");
$result=api_sql_query($sql);
while ($row=mysql_fetch_array($result))
{
$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" => $row['unsubscribe']);
}
display_courses($_uid, "subscribing", $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 $_uid;
echo "<p><b>".get_lang("SearchCourse")."</b><br>";
echo "<form class=\"course_list\" method=\"post\" action=\"".$_SERVER['PHP_SELF']."?action=subscribe\">",
"<input type=\"hidden\" name=\"search_course\" value=\"1\">",
"<input type=\"text\" name=\"search_term\" />",
" <input type=\"submit\" value=\"",get_lang("_search"),"\" />",
"</form>";
if (isset($_POST['search_course']))
{
echo "<p><b>".get_lang("SearchResultsFor")." ".$_POST['search_term']."</b><br>";
$result_search_courses_array=search_courses($_POST['search_term']);
display_courses($_uid, "subscribing", $result_search_courses_array);
}
}
/**
* This function filters dangerous stuff out. It does addslashes when the php.ini setting
* magic_quotes is set to off.
* @author Olivier Cauberghe <olivier.cauberghe@UGent.be>, Ghent University
* @param string something that possibly needs addslashing
* @return string the addslahed version of the input
*/
function escape($s)
{
if(!get_magic_quotes_gpc())
return addslashes($s);
else return $s;
}
/**
* 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(MAIN_COURSE_TABLE);
$search_term_safe=escape($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."%'";
$result_find=mysql_query($sql_find) or die(mysql_error());
while ($row=mysql_fetch_array($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 $_uid, $user_personal_database;
$DATABASE_USER_TOOLS = $user_personal_database;
$TABLE_USER_COURSE_CATEGORY = $DATABASE_USER_TOOLS."`.`user_course_category";
$TABLECOURSUSER=Database::get_main_table(MAIN_COURSE_USER_TABLE);
$sql_delete="DELETE FROM `$TABLE_USER_COURSE_CATEGORY` WHERE id='".$id."' and user_id='".$_uid."'";
$sql_update="UPDATE $TABLECOURSUSER SET user_course_cat='0' WHERE user_course_cat='".$id."' AND user_id='".$_uid."'";
mysql_query($sql_delete) or die(mysql_error());
mysql_query($sql_update) or die(mysql_error());
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 $_uid, $user_personal_database;
$DATABASE_USER_TOOLS = $user_personal_database;
$TABLE_USER_COURSE_CATEGORY = $DATABASE_USER_TOOLS."`.`user_course_category";
$sql_insert="INSERT INTO `$TABLE_USER_COURSE_CATEGORY` (user_id, title) VALUES ('".$_uid."', '".addslashes($_POST['title_course_category'])."')";
api_sql_query($sql_insert);
return get_lang("CourseCategoryStored");
}
/**
* 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 $_uid, $user_personal_database;
echo "<form name=\"create_course_category\" method=\"post\" action=\"".$_SERVER['PHP_SELF']."?action=sortmycourses\">\n";
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");
$DATABASE_USER_TOOLS = $user_personal_database;
$TABLE_USER_COURSE_CATEGORY = $DATABASE_USER_TOOLS."`.`user_course_category";
$sql="SELECT * FROM `$TABLE_USER_COURSE_CATEGORY` WHERE user_id='".$_uid."'";
$result=api_sql_query($sql, __LINE__, __FILE__);
echo "<ul>\n";
while ($row=mysql_fetch_array($result))
{
echo "\t<li>".$row['title']."</li>\n";
}
echo "</ul>\n";
}
/**
* 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 $newcategory : the id of the user course category we are moving the course to.
* @return string a language variable saying that the course was moved.
*/
function store_editcoursecategory($course_code, $newcategory)
{
global $_uid;
$TABLECOURSUSER = Database::get_main_table(MAIN_COURSE_USER_TABLE);
$max_sort_value=max_sort_value($newcategory);
$sql="UPDATE $TABLECOURSUSER SET user_course_cat='".$newcategory."', sort='".($max_sort_value+1)."' WHERE course_code='".$course_code."' AND user_id='".$_uid."'";
$result=api_sql_query($sql);
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)
{
global $_uid;
$TABLECOURSUSER = Database::get_main_table(MAIN_COURSE_USER_TABLE);
$user_courses=get_courses_of_user($_uid);
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'])
}
$sql_update1="UPDATE $TABLECOURSUSER SET sort='".$target_course['sort']."' WHERE course_code='".$source_course['code']."' AND user_id='".$_uid."'";
$sql_update2="UPDATE $TABLECOURSUSER SET sort='".$source_course['sort']."' WHERE course_code='".$target_course['code']."' AND user_id='".$_uid."'";
mysql_query($sql_update2);
mysql_query($sql_update1);
return get_lang("CourseSortingDone");
}
/**
* 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, $parameter, $user_courses)
{
$number_of_courses=count($user_courses);
if ($number_of_courses==0)
{
return false;
}
$user_course_category=0;
echo "<table cellpadding=\"4\">\n";
foreach ($user_courses as $key=>$course)
{
// displaying the course group title if needed
$user_course_category=$course['user_course_category'];
if ($user_course_category<>0 and $user_course_category<>$prev_user_course_category)
{
echo "<tr><td colspan=\"2\" class=\"user_course_category\">".get_user_course_category($user_course_category);
echo " <a href=\"courses.php?action=deletecoursecategory&id=".$user_course_category."\">";
if ($_GET['action']=="sortmycourses")
{ echo "<img src=\"../img/delete.gif\" onclick=\"javascript:if(!confirm('".addslashes(htmlentities(get_lang("CourseCategoryAbout2bedeleted")))."')) return false;\">"; }
echo "</a></td></tr>";
}
// displaying the course title, visual code and teacher/teaching staff
echo "\t<tr>\n";
echo "\t\t<td>\n";
echo "<b>".$course['title']."</b><br>";
if (get_setting("display_coursecode_in_courselist") == "true")
{
echo $course['visual_code'];
}
if (get_setting("display_coursecode_in_courselist") == "true" && get_setting("display_teacher_in_courselist") == "true")
{
echo " - ";
}
if (get_setting("display_teacher_in_courselist") == "true")
{
echo $course['tutor'];
}
echo "\t\t</td>\n";
// displaying the up/down/edit icons when we are sorting courses
echo "\t\t<td align=\"top\">\n";
if ($parameter=="sorting")
{
display_sorting_icons($key, $number_of_courses, $course, $user_courses);
}
// displaying the delete icon when we are unsubscribing from courses
if($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";
$prev_user_course_category=$user_course_category;
}
echo "</table>\n";
}
/**
* 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 $_uid, $user_personal_database;
$DATABASE_USER_TOOLS = $user_personal_database;
$TABLE_USER_COURSE_CATEGORY = $DATABASE_USER_TOOLS."`.`user_course_category";
$sql="SELECT * FROM `".$TABLE_USER_COURSE_CATEGORY."` WHERE user_id='$_uid' AND id='$id'";
$result=mysql_query($sql) or die(mysql_error());
$row=mysql_fetch_array($result);
return $row['title'];
}
/**
* 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)
{
global $_uid;
// getting all the courses to which the user is subscribed to
$user_courses=get_courses_of_user($_uid);
// 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'];
}
}
else
{
$user_coursecodes=array();
}
// we display the icon to subscribe or the text already subscribed
if (in_array($current_course['code'],$user_coursecodes))
{
echo get_lang("AlreadySubscribed");
}
else
{
if ($current_course['subscribe'] == SUBSCRIBE_ALLOWED)
{
echo"<form action=\"".$_SERVER["REQUEST_URI"]."\" method=\"post\"><input type=\"hidden\" name=\"subscribe\" value=\"".$current_course['code']."\" /><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
* subscribe to this course
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @param $key:
* $number_of_courses
* $course
* $user_courses
* @return html a small table containing the up/down icons and the edit icon (for moving to a different user course category)
* @todo complete the comments on this function: the parameter section
*/
function display_sorting_icons($key, $number_of_courses, $course, $user_courses)
{
echo "<table><tr><td>";
// the up icon
if ($key>0 AND $user_courses[$key-1]['user_course_category']==$course['user_course_category'])
{echo "<a href=\"courses.php?action=".$_GET['action']."&move=up&course=".$course['code']."\"><img src=\"../img/up.gif\" alt=\"".htmlentities(get_lang("Up"))."\"></a>"; }
echo "</td>";
// the edit icon OR the edit dropdown list
if (isset($_GET['edit']) and $course['code']==$_GET['edit'])
{ echo "<td rowspan=\"2\" valign=\"middle\">".display_edit_course_categery_form($_GET['edit'])."</td>"; }
else
{ echo "<td rowspan=\"2\" valign=\"middle\"><a href=\"courses.php?action=".$_GET['action']."&edit=".$course['code']."\"><img src=\"../img/edit.gif\"></a></td>"; }
echo "</tr><tr><td>";
if ($key<$number_of_courses-1 AND $user_courses[$key+1]['user_course_category']==$course['user_course_category'])
{ echo "<a href=\"courses.php?action=".$_GET['action']."&move=down&course=".$course['code']."\"><img src=\"../img/down.gif\" alt=\"".htmlentities(get_lang("Down"))."\"></a>"; }
echo "</td></tr></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 $edit_course:
* @return html a dropdown list containing all the user defined course categories and a submit button
* @todo when editing (moving) a course inside a user defined course category to a different user defined category
* the dropdown list should have the current course category selected.
*/
function display_edit_course_categery_form($edit_course)
{
global $_uid, $user_personal_database;
$DATABASE_USER_TOOLS = $user_personal_database;
$TABLE_USER_COURSE_CATEGORY = $DATABASE_USER_TOOLS."`.`user_course_category";
$sql="SELECT * FROM `$TABLE_USER_COURSE_CATEGORY` WHERE user_id='".$_uid."'";
$result=api_sql_query($sql);
$output="<form name=\edit_course_category\" method=\"post\" action=\"courses.php?action=".$_GET['action']."\">\n";
$output.="<input type=\"hidden\" name=\"course_2_edit_category\" value=\"".$edit_course."\">";
$output.="\t<select name=\"course_categories\">\n";
$output.="\t\t<option value=\"0\">".get_lang("NoCourseCategory")."</option>";
while ($row=mysql_fetch_array($result))
{$output.="\t\t<option value=\"".$row['id']."\">".$row['title']."</option>";}
$output.="\t</select>\n";
$output.="\t<input type=\"submit\" name=\"submit_edit_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)
{
if ($course['status'] != 1)
{
if ($course['unsubscribe'] == 1)
{ // changed link to submit to avoid action by the search tool indexer
echo "<form action=\"".$_SERVER['PHP_SELF']."\" method=\"post\" onsubmit=\"javascript:if(!confirm('".addslashes(htmlentities(get_lang("ConfirmUnsubscribeFromCourse")))."')) return false;\"><input type=\"hidden\" name=\"unsubscribe\" value=\"".$course['code']."\" /><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(MAIN_COURSE_TABLE);
$TABLECOURSUSER=Database::get_main_table(MAIN_COURSE_USER_TABLE);
$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.user_course_cat, course_rel_user.sort ASC";
$result = api_sql_query($sql_select_courses) or die(mysql_error());
while ($row=mysql_fetch_array($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;
}
/**
* @param string $text: the text that has to be written in grey
* @return string: the text with the grey formatting
* @todo move this to a stylesheet
*/
function display_info_text($text)
{
echo "<font color=\"#808080\">" . $text . "</font>\n";
}
?>
See more files for this project here