Witam
Przerabiam książkę i jest tam taka klasa, która trochę zmieniłem. Lecz po uruchomieniu wyskakuje mi wiele błędów. Co robię nie tak, że mam tyle błędów. Np. W 164 LINI wyskakuje taki błąd

Undefined variable: objDB in C:\wamp\www\lookbook\class\class.UserSession.php on line 164

linia ta zawiera taki kod:

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$row=$objDB->select($sql);
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a gdy zamienie to na:

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$row=Datebase::select($sql);
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to działa dobrze. Gdzie jest tu błąd skoro w konstruktorze stworzyłem taki obiekt.
?
a to reszta błędów:

1.Undefined index: HTTP_USER_AGENT in C:\wamp\www\lookbook\class\class.UserSession.php on line 27
2.PHPSESSID in C:\wamp\www\lookbook\class\class.UserSession.php on line 28
3.HTTP_USER_AGENT in C:\wamp\www\lookbook\class\class.UserSession.php on line 158
4.Undefined variable: objDB in C:\wamp\www\lookbook\class\class.UserSession.php on line 164
5.Call to a member function select() on a non-object in C:\wamp\www\lookbook\class\class.UserSession.php on line 164

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<?php
 
require_once('class.User.php');
require_once('class.Datebase.php');
 
class UserSession extends User{
    private $php_sesion_id;
    private $native_session_id;
    private $dbhandle;
    private $logged_in;
    private $session_tieout = 600;
    private $session_lifespan =3600;
 
    public function __construct() {
        $objDB= new Datebase();
        //$dbhandle=$objDB->connect();
 
        session_set_save_handler(
          array(&$this, '_session_open_method'), 
          array(&$this, '_session_close_method'), 
          array(&$this, '_session_read_method'), 
          array(&$this, '_session_write_method'), 
          array(&$this, '_session_destroy_method'), 
          array(&$this, '_session_gc_method')
        );
 
        $strUserAgent = $GLOBALS["HTTP_USER_AGENT"];
        if ($_COOKIE["PHPSESSID"]){
            $this->php_sesion_id=$_COOKIE["PHPSESSID"];
            $sql = "SELECT session_id FROM session_user 
                    WHERE session_id_ascci = '" . $this->php_session_id . 
                    "' AND ((now() - session_when_start) < ' " . $this->session_lifespan . " seconds') 
                    AND session_user_agent='" . $strUserAgent . "' 
                    AND ((now() - session_last_impress) <= '".$this->session_timeout." seconds' 
                    OR session_last_impress IS NULL)";
 
            $result=$objDB->select($sql);
            if($objDB->dbNumRows==0) {
                $failed =0;
                $sql ="DELETE FROM session_user
                      WHERE (session_id_ascci = '". $this->php_session_id . "') 
                      OR (now() - session_when_start) > $maxlifetime)";
                $result =$objDB->delete($sql);
 
                $sql="DELETE FROM session_user
                     WHERE session_id 
                     NOT IN (SELECT session_id FROM session_user)";
                $result=$objDB->delete($sql);
                unset($_COOKIE["PHPSESSID"]);
            };
        };
        session_set_cookie_params($this->session_lifespan);
        session_start();
        return $objDB;
    }
 
    public function Impress() {
        if ($this->native_session_id) {
            $sql="UPDATE session_user
                 SET session_last_impress = now() 
                 WHERE session_id = " . $this->native_session_id;
            $result = $objDB->update($sql);
        }
    }
 
    public function IsLoggedIn() {
        return($this->logged_in);
    }
 
    public function GetUserID(){
        if ($this->logged_in){
            return($this->user_id);
        } else {
            return(false);
        }
    }
 
    /*public function GetUserObject() {
        if($this->logged_in){
            if (class_exists("User")) {
                $objUser = new User($this->user_id);
                return($objUser);   
            } else { 
                return(false);
            }
        }
    }*/
 
    public function GetSessionIndentifier() {
        return($this->php_sesion_id);
    }
 
    public function Login($strUsername, $strUserPassword){
        $strUserPasswordSHA1= sha1($strUserPassword);
        $sql="SELECT user_id FROM user
             WHERE user_name = '$strUsername' 
             AND user_password = '$strUserPasswordSHA1'";
 
        $row=$objDB->select($sql);
        if ($objDB->dbNumRows>0) {
            $this->user_id=$row['session_user_id'];
            $this->logged_in =true;
            $sql="UPDATE session_user
                 SET session_logged = true, session_user_id = " . $this->user_id . " 
                 WHERE session_id = " . $this->native_session_id;
            $objDB->update($sql);
            return(true);
        } else {
            return(false);
        }
    }
 
    public function LogOut() {
        if ($this->logged_in== true) {
            $sql="UPDATE session_user
                 SET session_logged = false, session_user_id = 0 
                 WHERE session_id = " . $this->native_session_id;
            $objDB->update();
            $this->logged_in=false;
            $this->user_id=0;
            return(true);
        } else {
            return(false);
        }
    }
 
    public function _get($nm) {
        $sql="SELECT wartosc_zmiennej 
             FROM zmienna_sesji 
             WHERE identyfikator_sesji = " . $this->native_session_id . " 
             AND nazwa_zmiennej = '" . $nm . "'";
        $row=$objDB->select($sql);
        if ($objDB->dbNumRows>0) {
            returnunserialize($row["wartosc_zmiennej"]);
        } else {
            return(false);
        }
    }
 
    public function _set($nm, $val) {
        $strSer = serialize($val);
        $sql="INSERT INTO zmienna_sesji(identyfikator_sesji, nazwa_zmiennej, wartosc_zmiennej) 
             VALUES(" . $this->native_session_id . ", '$nm', '$strSer')";
        $objDB->insert($sql);
 
    }
 
    private function _session_open_method($save_path, $session_name){
        return(true);
    }
 
    private function _session_close_method() {
        //mysql_close($this->dbhandle);
        return(true);
    }
 
    private function _session_read_method($id) {
        $strUserAgent= $GLOBALS["HTTP_USER_AGENT"];
        $this->php_session_id = $id;
        $failed=1;
        $sql="SELECT * 
             FROM session_user
             WHERE session_id_ascii = '$id'";
        $row=Datebase::select($sql);
        if ($objDB->dbNumRows>0) {
            $this->native_session_id = $row['session_id'];
            if ($row['session_logged']=="t") {
                $this->logged_in=true;
                $this->user_id = $row["session_user_id"];
            } else {
                $this->logged_in = false;
            }
        } else {
            $this->logged_in = false;
            $sql="INSERT INTO session_user(session_user_ascii, session_logged, session_user_id, session_when_start, session_user_agent) 
                 VALUES ('$id','f',0,now(),'$strUserAgent')";
            $objDB->insert($sql);
 
            $sql="SELECT session_id from \"session_user\" 
                 WHERE session_id_ascii = '$id'";
            $row=Datebase::select($sql);
            $this->native_session_id = $row["session_id"];
 
        }
        return("");    
    }
 
    private function _session_write_method($id, $sess_data) {
        return(true);
    }
 
    private function _session_destroy_method($id) {
        $sql="DELETE FROM session_user
             WHERE session_id_ascii = '$id'";
        $result=Datebase::delete($sql);
        return($result);
    }
 
    private function _session_gc_method($maxlifetime) {
        return(true);
    }
}
 
 
?>
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