/**
  * Delete user
  * @param   int   $user_id    User ID
  * @return  boolean   TRUE on success or FALSE on error
  */
 function deleteUser($user_id)
 {
     $result = false;
     if (!empty($user_id) && $this->_db_getList('id', 'id = ' . $user_id, 1)) {
         // Delete user
         if ($result = $this->_db_deleteRow($user_id)) {
             // Delete all avatars owned by user
             _pcpin_loadClass('avatar');
             $avatar = new PCPIN_Avatar($this);
             $avatar->deleteAvatar($user_id);
             // Delete all nicknames owned by user
             _pcpin_loadClass('nickname');
             $nickname = new PCPIN_Nickname($this);
             $nickname->deleteAllNickname($user_id);
             // Delete all messages sent TO this user
             _pcpin_loadClass('message');
             $message = new PCPIN_Message($this);
             if ($message->_db_getList('id', 'target_user_id = ' . $user_id)) {
                 $message_ids = array();
                 foreach ($message->_db_list as $data) {
                     $message_ids[] = $data['id'];
                 }
                 $message->_db_freeList();
                 $message->deleteMessages($message_ids);
             }
             // Delete userdata
             _pcpin_loadClass('userdata');
             $userdata = new PCPIN_UserData($this);
             $userdata->deleteUserData($user_id);
             // Update all users who ignored deleted user
             if ($res = $this->_db_query($this->_db_makeQuery(2050, $user_id))) {
                 $this->_db_freeResult($res);
             }
         }
     }
     return $result;
 }