From 64d981a433d9990d4c5ff9454464a520e169adfd Mon Sep 17 00:00:00 2001
From: Alexander Schmidt <alex@treefish.org>
Date: Thu, 27 Sep 2012 18:23:40 +0200
Subject: [PATCH] ...

---
 admin/sessions.php  |  7 ++++++-
 include/banner.inc  |  6 ------
 include/session.inc | 14 ++++++++++----
 3 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/admin/sessions.php b/admin/sessions.php
index a04f485..f8153ba 100644
--- a/admin/sessions.php
+++ b/admin/sessions.php
@@ -8,7 +8,7 @@
     block("lightgreen", "added session");
   }
 
-  if($_GET['delete']!="") {
+  if(isset($_GET['delete'])) {
     $db->query("DELETE FROM sessions WHERE id=" . $_GET['delete']);
     block("red", "deleted session");
   }
@@ -31,6 +31,11 @@
 </form>
 
 <?php
+  if ( $SESSIONS_n == 0 ) {
+    block("red", "no sessions defined");
+    exit;
+  }
+
   block("black", "session overview");
 
   print "<table>";
diff --git a/include/banner.inc b/include/banner.inc
index 1599111..6ae3c07 100644
--- a/include/banner.inc
+++ b/include/banner.inc
@@ -1,12 +1,6 @@
 <?php
   include 'prefs.inc';
 
-  $lec_lines = file('var/lecture.txt');
-
-  foreach ($lec_lines as $line_num => $line) {
-    $lecture[$line_num] = $line;
-  }
-
   print "<table>";
     print "<tr><th align=\"left\">Banana Exercise Management</th><tr>";
     print "<tr><th bgcolor=blue><font color=white>&nbsp;" . $PREFS['exname'] . ", Gruppe: " . $PREFS['groupname'] . "&nbsp;</font></th></tr>";
diff --git a/include/session.inc b/include/session.inc
index 554ac1f..787d644 100644
--- a/include/session.inc
+++ b/include/session.inc
@@ -5,6 +5,7 @@
     $result=$db->query("SELECT id,examples,nexamples FROM sessions ORDER BY id");
     $SESSIONS_next = -1;
     $SESSIONS_actual = -1;
+    $SESSIONS_n = 0;
   
     while ($session = $result->fetch(PDO::FETCH_ASSOC)) {
       $SESSIONS[$session['id']] = array("id" => $session['id'], "timestr" => date("d.m.Y H:i", $session['id']),
@@ -16,18 +17,23 @@
       if ( strtotime("now") < $session['id'] + 3600  && ( $SESSIONS_actual==-1 || $SESSIONS_actual > $session['id'] )  ) {
         $SESSIONS_actual = $session['id'];
       }
+      $SESSIONS_n++;
     }
     if($SESSIONS_next == -1) unset($SESSIONS_next);
     if($SESSIONS_actual == -1) unset($SESSIONS_actual);
 
     $SESSIONS_totex = 0;
-    foreach ($SESSIONS as $session) {
-      if($session['id'] < $SESSIONS_next) { $SESSIONS_totex += $session['nexamples']; }
+    if(isset($SESSIONS)) {
+      foreach ($SESSIONS as $session) {
+        if($session['id'] < $SESSIONS_next) { $SESSIONS_totex += $session['nexamples']; }
+      }
     }
 
     $SESSIONS_totex_nextinc = 0;
-    foreach ($SESSIONS as $session) {
-      if($session['id'] <= $SESSIONS_next) { $SESSIONS_totex_nextinc += $session['nexamples']; }
+    if( isset($SESSIONS) && isset($SESSIONS_next) ) {
+      foreach ($SESSIONS as $session) {
+        if($session['id'] <= $SESSIONS_next) { $SESSIONS_totex_nextinc += $session['nexamples']; }
+      }
     }
   }
 ?>
-- 
2.39.5