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<!-- BEGIN switch_user_logged_in -->
Inhalt, der nur für eingeloggte Benutzer sichtbar sein soll ...
<!-- END switch_user_logged_in -->

Code: Alles auswählen

<!-- BEGIN switch_user_logged_out -->
Inhalt, der nur für ausgeloggte Benutzer sichtbar sein soll ...
<!-- END switch_user_logged_out -->

Code: Alles auswählen

//
// Überprüft die Zugehörigkeit eines Benutzers zu einer oder mehreren Gruppen
//
function user_in_group($group_ids, $user_id = false, $and = false)
{
   global $db, $userdata; 
   static $cache = array();
   
   if (!$user_id)
   {
      $user_id = $userdata['user_id'];
   }
   
   if (is_string($group_ids))
   {
      $group_ids = explode(',', $group_ids);
   }
   elseif (is_int($group_ids))
   {
      $group_ids = array($group_ids);
   }
   
   $check_ids = array();
   for ($i = 0, $count = count($group_ids); $i < $count; $i++)
   {
      $group_ids[$i] = intval($group_ids[$i]);
      if (!isset($cache[$user_id][$group_ids[$i]]))
      {
         $check_ids[] = $group_ids[$i];
      }
   }
   
   if (!empty($check_ids))
   {
      if (!isset($cache[$user_id]))
      {
         $cache[$user_id] = array();
      }
      
      foreach ($check_ids as $check_id)
      {
         $cache[$user_id][$check_id] = false;
      }
      
      $sql = 'SELECT g.group_id
         FROM ' . USER_GROUP_TABLE . ' ug, ' . GROUPS_TABLE . ' g
         WHERE g.group_id = ug.group_id
            AND (ug.user_id = ' . intval($user_id) . '
               OR g.group_moderator = ' . intval($user_id) . ')
            AND ug.group_id IN(' . implode(', ', $check_ids) . ')
         GROUP BY g.group_id';
      if (!$result = $db->sql_query($sql))
      {
         message_die(GENERAL_ERROR, 'Could not obtain groups', '', __LINE__, __FILE__, $sql);
      }
      
      while ($row = $db->sql_fetchrow($result))
      {
         $cache[$user_id][$row['group_id']] = true;
      }
      $db->sql_freeresult($result);
   }
   
   if ($and)
   {
      foreach ($group_ids as $group_id)
      {
         if (!$cache[$user_id][$group_id])
         {
            return false;
         }
      }
      
      return true;
   }
   else 
   {
      foreach ($group_ids as $group_id)
      {
         if ($cache[$user_id][$group_id])
         {
            return true;
         }
      }
      
      return false;
   }
}