<?PHP // $Id: index.php,v 1.109.2.3 2006/09/03 12:22:02 gustav_delius Exp $

//  Lists all the users within a given course

    require_once('../config.php');
    require_once($CFG->libdir.'/tablelib.php');

    define('USER_SMALL_CLASS', 20);   // Below this is considered small
    define('USER_LARGE_CLASS', 200);  // Above this is considered large
    define('DEFAULT_PAGE_SIZE', 20);

    $id           = required_param('id', PARAM_INT);                          // Course id
    $group        = optional_param('group', -1, PARAM_INT);                   // Group to show
    $page         = optional_param('page', 0, PARAM_INT);                     // which page to show
    $perpage      = optional_param('perpage', DEFAULT_PAGE_SIZE, PARAM_INT);  // how many per page
    $mode         = optional_param('mode', NULL);                             // '0' for less details, '1' for more
    $showteachers = optional_param('teachers', 1, PARAM_INT);                 // do we want to see the teacher list?
    $accesssince  = optional_param('accesssince',0,PARAM_INT);               // filter by last access. -1 = never
    $search       = optional_param('search','',PARAM_CLEAN);

    $showteachers = $showteachers && empty($search); // if we're searching, we just want students.

    if (! $course = get_record('course', 'id', $id)) {
        error("Course ID is incorrect");
    }

    require_login($course->id);

    if (!$course->category) {
        if (!$CFG->showsiteparticipantslist and !isteacher(SITEID)) {
            print_header("$course->shortname: ".get_string('participants'), $course->fullname,
                         get_string('participants'), "", "", true, "&nbsp;", navmenu($course));
            notice(get_string('sitepartlist0'));
        }
        if ($CFG->showsiteparticipantslist < 2 and !isteacherinanycourse()) {
            print_header("$course->shortname: ".get_string('participants'), $course->fullname,
                         get_string('participants'), "", "", true, "&nbsp;", navmenu($course));
            notice(get_string('sitepartlist1'));
        }
    }

    add_to_log($course->id, 'user', 'view all', 'index.php?id='.$course->id, '');

    $isteacher = isteacher($course->id);

    if (empty($isteacher)) {
        $search = false;
    }

    $countries = get_list_of_countries();

    $strnever = get_string('never');

    $datestring->day   = get_string('day');
    $datestring->days  = get_string('days');
    $datestring->hour  = get_string('hour');
    $datestring->hours = get_string('hours');
    $datestring->min   = get_string('min');
    $datestring->mins  = get_string('mins');
    $datestring->sec   = get_string('sec');
    $datestring->secs  = get_string('secs');

    if ($mode !== NULL) {
        $SESSION->userindexmode = $fullmode = ($mode == 1);
    } else if (isset($SESSION->userindexmode)) {
        $fullmode = $SESSION->userindexmode;
    } else {
        $fullmode = false;
    }

/// Check to see if groups are being used in this forum
/// and if so, set $currentgroup to reflect the current group

    $groupmode    = groupmode($course);   // Groups are being used
    $currentgroup = get_and_set_current_group($course, $groupmode, $group);

    if (!$currentgroup) {      // To make some other functions work better later
        $currentgroup  = NULL;
    }

    $isseparategroups = ($course->groupmode == SEPARATEGROUPS and $course->groupmodeforce and
                         !isteacheredit($course->id));

    if ($isseparategroups and (!$currentgroup) ) {  //XXX
        print_heading(get_string("notingroup", "forum"));
        print_footer($course);
        exit;
    }

    // Should use this variable so that we don't break stuff every time a variable is added or changed.
    $baseurl = $CFG->wwwroot.'/user/index.php?id='.$course->id.'&amp;group='.$currentgroup.'&amp;perpage='.$perpage.'&amp;teachers='.$showteachers.'&amp;accesssince='.$accesssince.'&amp;search='.$search;

/// Print headers

    if ($course->category) {
        print_header("$course->shortname: ".get_string('participants'), $course->fullname,
                     "<a href=\"../course/view.php?id=$course->id\">$course->shortname</a> -> ".
                     get_string('participants'), "", "", true, "&nbsp;", navmenu($course));
    } else {
        print_header("$course->shortname: ".get_string('participants'), $course->fullname,
                     get_string('participants'), "", "", true, "&nbsp;", navmenu($course));
    }


    //setting up tags
    if ($id == SITEID) {
        $filtertype = 'site';
    } else if ($id && !$currentgroup) {
        $filtertype = 'course';
        $filterselect = $id;
    } else {
        $filtertype = 'group';
        $filterselect = $currentgroup;
    }
    $currenttab = 'participants';
    $user = $USER;

    require_once($CFG->dirroot .'/user/tabs.php');


/// Get the hidden field list
    if ($isteacher || isadmin()) {
        $hiddenfields = array();  // teachers and admins are allowed to see everything
    } else {
        $hiddenfields = array_flip(explode(',', $CFG->hiddenuserfields));
    }

/// Print settings and things in a table across the top

    echo '<table class="controls" cellspacing="0"><tr>';

    //print my course menus
    echo '<td class="left">';
    print_string('mycourses');
    echo ': ';
    $mycourses = get_my_courses($USER->id);
    foreach ($mycourses as $mycourse) {
        $my_course[$mycourse->id] = $mycourse->shortname;
    }
    //choose_from_menu($my_course, 'id', $course->id, '', 'courseform.submit()');
    popup_form($CFG->wwwroot.'/user/index.php?id=',$my_course,'courseform',$course->id);
    echo '</td>';
    
    if ($groupmode == VISIBLEGROUPS or ($groupmode and isteacheredit($course->id))) {
        if ($groups = get_records_menu("groups", "courseid", $course->id, "name ASC", "id,name")) {
            echo '<td class="left">';
            print_group_menu($groups, $groupmode, $currentgroup, $baseurl);
            echo '</td>';
        }
    }

    if (!empty($isteacher)) {
        // get minimum lastaccess for this course and display a dropbox to filter by lastaccess going back this far.
        $minlastaccess = get_field_sql('SELECT min(timeaccess) FROM '.$CFG->prefix.'user_students WHERE course = '.$course->id.' AND timeaccess != 0');
        
        $lastaccess0exists = record_exists('user_students','course',$course->id,'timeaccess',0);
        $now = usergetmidnight(time());
        $timeaccess = array();
        
        // makes sense for this to go first.
        $timeoptions[0] = get_string('selectperiod');
        
        // days
        for ($i = 1; $i < 7; $i++) {
            if (strtotime('-'.$i.' days',$now) >= $minlastaccess) {
                $timeoptions[strtotime('-'.$i.' days',$now)] = get_string('numdays','moodle',$i);
            }
        }
        // weeks
        for ($i = 1; $i < 10; $i++) {
            if (strtotime('-'.$i.' weeks',$now) >= $minlastaccess) {
                $timeoptions[strtotime('-'.$i.' weeks',$now)] = get_string('numweeks','moodle',$i);
            }
        }
        // months 
        for ($i = 2; $i < 12; $i++) {
            if (strtotime('-'.$i.' months',$now) >= $minlastaccess) {
                $timeoptions[strtotime('-'.$i.' months',$now)] = get_string('nummonths','moodle',$i);
            }
        }
        // try a year
        if (strtotime('-1 year',$now) >= $minlastaccess) {
            $timeoptions[strtotime('-1 year',$now)] = get_string('lastyear');
        }
        
        if (!empty($lastaccess0exists)) {
            $timeoptions[-1] = get_string('never');
        } 
        
        if (count($timeoptions) > 1) {
            echo '<td class="left">';
            echo get_string('usersnoaccesssince').': ';
            $baseurl = preg_replace('/&amp;accesssince='.$accesssince.'/','',$baseurl);
            echo popup_form($baseurl.'&amp;accesssince=',$timeoptions,'timeoptions',$accesssince,'','','',true);
            echo '</td>';
        }
    }

    echo '<td class="right">';
    echo get_string('userlist').': ';
    $formatmenu = array( '0' => get_string('detailedless'),
                         '1' => get_string('detailedmore'));
    echo popup_form($baseurl.'&amp;mode=', $formatmenu, 'formatmenu', $fullmode, '', '', '', true);
    echo '</td></tr></table>';

    if ($currentgroup and (!$isseparategroups or isteacheredit($course->id))) {    /// Display info about the group
        if ($group = get_record('groups', 'id', $currentgroup)) {              
            if (!empty($group->description) or (!empty($group->picture) and empty($group->hidepicture))) { 
                echo '<table class="groupinfobox"><tr><td class="left side picture">';
                print_group_picture($group, $course->id, true, false, false);
                echo '</td><td class="content">';
                echo '<h3>'.$group->name;
                if (isteacheredit($course->id)) {
                    echo '&nbsp;<a title="'.get_string('editgroupprofile').'" href="../course/groups.php?id='.$course->id.'&amp;group='.$group->id.'">';
                    echo '<img src="'.$CFG->pixpath.'/t/edit.gif" alt="" border="0">';
                    echo '</a>';
                }
                echo '</h3>';
                echo format_text($group->description);
                echo '</td></tr></table>';
            }
        }
    }


    $exceptions = array(); // This will be an array of userids that are shown as teachers and thus
                           // do not have to be shown as users as well. Only relevant on site course.

    if ($isteacher) {
        echo '
<script Language="JavaScript">
<!--
function checksubmit(form) {
    var destination = form.formaction.options[form.formaction.selectedIndex].value;
    if (destination == "" || !checkchecked(form)) {
        form.formaction.selectedIndex = 0;
        return false;
    } else {
        return true;
    }
}

function checkchecked(form) {
    var inputs = document.getElementsByTagName(\'INPUT\');
    var checked = false;
    inputs = filterByParent(inputs, function() {return form;});
    for(var i = 0; i < inputs.length; ++i) {
        if(inputs[i].type == \'checkbox\' && inputs[i].checked) {
            checked = true;
        }
    }
    return checked;
}
//-->
</script>
';
        echo '<form action="action_redir.php" method="post" name="studentsform" onSubmit="return checksubmit(this);">';
        echo '<input type="hidden" name="id" value="'.$id.'" />';
        echo '<input type="hidden" name="returnto" value="'.$_SERVER['REQUEST_URI'].'" />';
        echo '<input type="hidden" name="sesskey" value="'.$USER->sesskey.'" />';
    }

    if($showteachers) {

        $tablecolumns = array('picture', 'fullname');
        $tableheaders = array('', get_string('fullname'));
        if (!isset($hiddenfields['city'])) {
            $tablecolumns[] = 'city';
            $tableheaders[] = get_string('city');
        }
        if (!isset($hiddenfields['country'])) {
            $tablecolumns[] = 'country';
            $tableheaders[] = get_string('country');
        }
        if (!isset($hiddenfields['lastaccess'])) {
            $tablecolumns[] = 'lastaccess';
            $tableheaders[] = get_string('lastaccess');
        }

        if ($isteacher) {
            $tablecolumns[] = '';
            $tableheaders[] = get_string('select');
        }

        $table = new flexible_table('user-index-teachers-'.$course->id);

        $table->define_columns($tablecolumns);
        $table->define_headers($tableheaders);
        $table->define_baseurl($baseurl);

        $table->sortable(true, 'lastaccess', SORT_DESC);

        $table->set_attribute('cellspacing', '0');
        $table->set_attribute('id', 'teachers');
        $table->set_attribute('class', 'generaltable generalbox');

        $table->setup();

        if($whereclause = $table->get_sql_where()) {
            $whereclause .= ' AND ';
        }

        $teachersql = "SELECT u.id, u.username, u.firstname, u.lastname, u.maildisplay, u.mailformat, u.maildigest,
                                   u.email, u.maildisplay, u.city, u.country, u.lastlogin, u.picture, u.lang, u.timezone,
                                   u.emailstop, t.authority,t.role,t.editall,t.timeaccess as lastaccess, m.groupid
                            FROM {$CFG->prefix}user u
                       LEFT JOIN {$CFG->prefix}user_teachers t ON t.userid = u.id 
                       LEFT JOIN {$CFG->prefix}groups_members m ON m.userid = u.id ";

        if($isseparategroups) {
            $whereclause .= '(t.editall OR groupid = '.$currentgroup.') AND ';
        }
        else if ($currentgroup) {    // Displaying a group by choice
            $whereclause .= 'groupid = '.$currentgroup.' AND ';
        }

        $teachersql .= 'WHERE '.$whereclause.' t.course = '.$course->id.' AND u.deleted = 0 AND u.confirmed = 1';
        if (!$isteacher) {
            $teachersql .= ' AND t.authority > 0';
        }

        if ($isteacher) {
            $teachersql .= get_lastaccess_sql($accesssince);
        }

        if($sortclause = $table->get_sql_sort()) {
            $teachersql .= ' ORDER BY '.$sortclause;
        }

        $teachers = get_records_sql($teachersql);

        if(!empty($teachers)) {

            echo '<h2>'.$course->teachers;
            echo ' <a href="'.$baseurl.'&amp;teachers=0">';
            echo '<img src="'.$CFG->pixpath.'/i/hide.gif" height="16" width="16" alt="'.get_string('hide').'" /></a>';
            if (isadmin() or ($course->category and (iscreator() or (isteacheredit($course->id) and !empty($CFG->teacherassignteachers))))) {
                echo ' <a href="'.$CFG->wwwroot.'/course/teacher.php?id='.$course->id.'">';
                echo '<img src="'.$CFG->pixpath.'/i/edit.gif" height="16" width="16" alt="'.get_string('edit').'" /></a>';
            }
            echo '</h2>';

            $exceptions = array_keys($teachers);

            if ($fullmode) {
                foreach ($teachers as $key => $teacher) {
                    print_user($teacher, $course, true);
                }
            } else {
                $countrysort = (strpos($sortclause, 'country') !== false);
                foreach ($teachers as $teacher) {
        
                    if ($teacher->lastaccess) {
                        $lastaccess = format_time(time() - $teacher->lastaccess, $datestring);
                    } else {
                        $lastaccess = $strnever;
                    }

                    if (empty($teacher->country)) {
                        $country = '';
                    }
                    else {
                        if($countrysort) {
                            $country = '('.$teacher->country.') '.$countries[$teacher->country];
                        }
                        else {
                            $country = $countries[$teacher->country];
                        }
                    }
        
                    $data = array (
                                    print_user_picture($teacher->id, $course->id, $teacher->picture, false, true),
                                    '<strong><a'.($teacher->authority?'':' class="dimmed"').' href="'.$CFG->wwwroot.'/user/view.php?id='.$teacher->id.'&amp;course='.$course->id.'">'.fullname($teacher, $isteacher).'</a></strong>');
                    if (!isset($hiddenfields['city'])) {
                        $data[] = $teacher->city;
                    }
                    if (!isset($hiddenfields['country'])) {
                        $data[] = $country;
                    }
                    if (!isset($hiddenfields['lastaccess'])) {
                        $data[] = $lastaccess;
                    }
                    if ($isteacher) {
                        $data[] = '<input type="checkbox" name="teacher'.$teacher->id.'" />';
                    }
                    $table->add_data($data);
                }
                
                $table->print_html();
            }
        }
    }
    else {
        // Don't show teachers
        echo '<h2>'.$course->teachers;
        echo ' <a href="'.$baseurl.'&amp;teachers=1">';
        echo '<img src="'.$CFG->pixpath.'/i/show.gif" height="16" width="16" alt="'.get_string('show').'" /></a>';
        if (isadmin() or ($course->category and (iscreator() or (isteacheredit($course->id) and !empty($CFG->teacherassignteachers))))) {
            echo ' <a href="'.$CFG->wwwroot.'/course/teacher.php?id='.$course->id.'">';
            echo '<img src="'.$CFG->pixpath.'/i/edit.gif" height="16" width="16" alt="'.get_string('edit').'" /></a>';
        }
        echo '</h2>';
    }

    $guest = get_guest();
    $exceptions[] = $guest->id;

    $tablecolumns = array('picture', 'fullname');
    $tableheaders = array('', get_string('fullname'));
    if (!isset($hiddenfields['city'])) {
        $tablecolumns[] = 'city';
        $tableheaders[] = get_string('city');
    }
    if (!isset($hiddenfields['country'])) {
        $tablecolumns[] = 'country';
        $tableheaders[] = get_string('country');
    }
    if (!isset($hiddenfields['lastaccess'])) {
        $tablecolumns[] = 'lastaccess';
        $tableheaders[] = get_string('lastaccess');
    }

    if ($course->enrolperiod) {
       $tablecolumns[] = 'timeend';
       $tableheaders[] = get_string('enrolmentend');
    }

    if ($isteacher) {
       $tablecolumns[] = '';
       $tableheaders[] = get_string('select');
    }

    $table = new flexible_table('user-index-students-'.$course->id);

    $table->define_columns($tablecolumns);
    $table->define_headers($tableheaders);
    $table->define_baseurl($baseurl);

    $table->sortable(true, 'lastaccess', SORT_DESC);

    $table->set_attribute('cellspacing', '0');
    $table->set_attribute('id', 'students');
    $table->set_attribute('class', 'generaltable generalbox');

    $table->set_control_variables(array(
        TABLE_VAR_SORT    => 'ssort',
        TABLE_VAR_HIDE    => 'shide',
        TABLE_VAR_SHOW    => 'sshow',
        TABLE_VAR_IFIRST  => 'sifirst',
        TABLE_VAR_ILAST   => 'silast',
        TABLE_VAR_PAGE    => 'spage'
    ));
    $table->setup();

    if(SITEID == $course->id) {
        $select = 'SELECT u.id, u.username, u.firstname, u.lastname, u.email, u.city, u.country, 
                      u.picture, u.lang, u.timezone, u.emailstop, u.maildisplay, u.lastaccess ';
        $from   = 'FROM '.$CFG->prefix.'user u ';
        $where  = 'WHERE confirmed = 1 AND u.deleted = 0 ';
    }
    else {
        $select = 'SELECT u.id, u.username, u.firstname, u.lastname, u.email, u.city, u.country, 
                      u.picture, u.lang, u.timezone, u.emailstop, u.maildisplay, s.timeaccess AS lastaccess ';
        $select .= $course->enrolperiod?', s.timeend ':'';
        $from   = 'FROM '.$CFG->prefix.'user u LEFT JOIN '.$CFG->prefix.'user_students s ON s.userid = u.id ';
        $where  = 'WHERE s.course = '.$course->id.' AND u.deleted = 0 ';
    }

    if ($isteacher) {
        $where .= get_lastaccess_sql($accesssince);
    }

    $wheresearch = '';

    if (!empty($search)) {
        $LIKE = sql_ilike();
        $fullname  = sql_fullname('u.firstname','u.lastname');
        $wheresearch .= ' AND ('. $fullname .' '. $LIKE .'\'%'. $search .'%\' OR email '. $LIKE .'\'%'. $search .'%\' OR idnumber '.$LIKE.' \'%'.$search.'%\') ';

    }

    if ($currentgroup) {    // Displaying a group by choice
        // FIX: TODO: This will not work if $currentgroup == 0, i.e. "those not in a group"
        $from  .= 'LEFT JOIN '.$CFG->prefix.'groups_members gm ON u.id = gm.userid ';
        $where .= ' AND gm.groupid = '.$currentgroup;
    }

    if($course->id == SITEID) {
        $where .= ' AND u.id NOT IN ('.implode(',', $exceptions).')';
    }

    $totalcount = count_records_sql('SELECT COUNT(*) '.$from.$where);

    if($table->get_sql_where()) {
        $where .= ' AND '.$table->get_sql_where();
    }

    if($table->get_sql_sort()) {
        $sort = ' ORDER BY '.$table->get_sql_sort();
    }
    else {
        $sort = '';
    }

    $matchcount = count_records_sql('SELECT COUNT(*) '.$from.$where.$wheresearch);

    $table->initialbars($totalcount > $perpage);
    $table->pagesize($perpage, $matchcount);

    if($table->get_page_start() !== '' && $table->get_page_size() !== '') {
        $limit = ' '.sql_paging_limit($table->get_page_start(), $table->get_page_size());
    }
    else {
        $limit = '';
    }    
    
    $students = get_records_sql($select.$from.$where.$wheresearch.$sort.$limit);

    $a->count = $totalcount;
    $a->items = $totalcount == 1 ? $course->student : $course->students;
    echo '<h2>'.get_string('counteditems', '', $a);
    if (isteacheredit($course->id)) {
        echo ' <a href="../course/student.php?id='.$course->id.'">';
        echo '<img src="'.$CFG->pixpath.'/i/edit.gif" height="16" width="16" alt="" /></a>';
    }
    echo '</h2>';

    if ($CFG->longtimenosee > 0 && $CFG->longtimenosee < 1000 && $totalcount > 0) {
        echo '<p id="longtimenosee">('.get_string('unusedaccounts', '', $CFG->longtimenosee).')</p>';
    }

    if ($fullmode) {    // Print simple listing
        if ($totalcount < 1) {
            print_heading(get_string("nostudentsfound", "", $course->students));
        }
        else {
            
            if($totalcount > $perpage) {

                $firstinitial = $table->get_initial_first();
                $lastinitial  = $table->get_initial_last();
                $strall = get_string('all');
                $alpha  = explode(',', get_string('alphabet'));
    
                // Bar of first initials
    
                echo '<div class="initialbar firstinitial">'.get_string('firstname').' : ';
                if(!empty($firstinitial)) {
                    echo '<a href="'.$baseurl.'&amp;sifirst=">'.$strall.'</a>';
                } else {
                    echo '<strong>'.$strall.'</strong>';
                }
                foreach ($alpha as $letter) {
                    if ($letter == $firstinitial) {
                        echo ' <strong>'.$letter.'</strong>';
                    } else {
                        echo ' <a href="'.$baseurl.'&amp;sifirst='.$letter.'">'.$letter.'</a>';
                    }
                }
                echo '</div>';
    
                // Bar of last initials
    
                echo '<div class="initialbar lastinitial">'.get_string('lastname').' : ';
                if(!empty($lastinitial)) {
                    echo '<a href="'.$baseurl.'&amp;silast=">'.$strall.'</a>';
                } else {
                    echo '<strong>'.$strall.'</strong>';
                }
                foreach ($alpha as $letter) {
                    if ($letter == $lastinitial) {
                        echo ' <strong>'.$letter.'</strong>';
                    } else {
                        echo ' <a href="'.$baseurl.'&amp;silast='.$letter.'">'.$letter.'</a>';
                    }
                }
                echo '</div>';

                print_paging_bar($matchcount, intval($table->get_page_start() / $perpage), $perpage, $baseurl.'&amp;', 'spage');

            }

            if($matchcount > 0) {
                foreach ($students as $student) {
                    print_user($student, $course, true);
                }
            }
            else {
                print_heading(get_string('nothingtodisplay'));
            }
        }
    }
    else {
        $countrysort = (strpos($sort, 'country') !== false);
        $timeformat = get_string('strftimedate');
        if (!empty($students))  {
            foreach ($students as $student) {
                if ($student->lastaccess) {
                    $lastaccess = format_time(time() - $student->lastaccess, $datestring);
                } else {
                    $lastaccess = $strnever;
                }
    
                if (empty($student->country)) {
                    $country = '';
                }
                else {
                    if($countrysort) {
                        $country = '('.$student->country.') '.$countries[$student->country];
                    }
                    else {
                        $country = $countries[$student->country];
                    }
                }

                $data = array (
                        print_user_picture($student->id, $course->id, $student->picture, false, true),
                        '<strong><a href="'.$CFG->wwwroot.'/user/view.php?id='.$student->id.'&amp;course='.$course->id.'">'.fullname($student).'</a></strong>');
                if (!isset($hiddenfields['city'])) {
                    $data[] = $student->city;
                }
                if (!isset($hiddenfields['country'])) {
                    $data[] = $country;
                }
                if (!isset($hiddenfields['lastaccess'])) {
                    $data[] = $lastaccess;
                }
                if ($course->enrolperiod) {
                    if ($student->timeend) {
                        $data[] = userdate($student->timeend, $timeformat);
                    } else {
                        $data[] = get_string('unlimited');
                    }
                }
                if ($isteacher) {
                    $data[] = '<input type="checkbox" name="user'.$student->id.'" />';
                }
                $table->add_data($data);

            }
        }

        $table->print_html();

    }

    if ($isteacher) {
        echo '<br /><center>';
        echo '<input type="button" onclick="checkall()" value="'.get_string('selectall').'" /> ';
        echo '<input type="button" onclick="checknone()" value="'.get_string('deselectall').'" /> ';
        $displaylist['messageselect.php'] = get_string('messageselectadd');
        if ($course->enrolperiod) {
            $displaylist['extendenrol.php'] = get_string('extendenrol');
        }
        choose_from_menu ($displaylist, "formaction", "", get_string("withselectedusers"), "if(checksubmit(this.form))this.form.submit();", "");
        helpbutton("participantswithselectedusers", get_string("withselectedusers"));
        echo '<input type="submit" value="' . get_string('ok') . '"';
        echo '</center></form>';
    }

    if ($isteacher && $totalcount > ($perpage*3)) {
        echo '<form action="index.php"><p align="center"><input type="hidden" name="id" value="'.$course->id.'" />'.get_string('search').':&nbsp;'."\n";
        echo '<input type="text" name="search" value="'.$search.'" />&nbsp;<input type="submit" value="'.get_string('search').'" /></p></form>'."\n";
    }

    if ($perpage == 99999) {
        echo '<div id="showall"><a href="'.$baseurl.'&amp;perpage='.DEFAULT_PAGE_SIZE.'">'.get_string('showperpage', '', DEFAULT_PAGE_SIZE).'</a></div>';
    }
    else if ($matchcount > 0 && $perpage < $matchcount) {
        echo '<div id="showall"><a href="'.$baseurl.'&amp;perpage=99999">'.get_string('showall', '', $matchcount).'</a></div>';
    }
    
    print_footer($course);


function get_lastaccess_sql($accesssince='') {
    if (empty($accesssince)) {
        return '';
    }
    if ($accesssince == -1) { // never
        return ' AND timeaccess = 0';
    } else {
        return ' AND timeaccess != 0 AND timeaccess < '.$accesssince;
    }
}

?>