Your object is $obj and not $this . We call $this inside a class . $obj = new login; if(!$obj->isLoggedi n('admin' )){ if($obj->sentData( )){ $this->setData( $_POST['username '],$_POST[ 'password' ]); $this->doLogin( ); So please change the lines . I am seeing some spaces . ( Eg : $obj->isLoggedi n('admin' ) ) , don't know whether there is any in the file. So if you still have trouble attach the file , than copy and paste .. Hari K T http://harikt.com/ --- On Wed, 17/6/09, la_t3leeq <la_t3leeq@xxxxxxxxx> wrote: From: la_t3leeq <la_t3leeq@xxxxxxxxx> Subject: call to undefined method error ( but i defined it !!) To: php-objects@xxxxxxxxxxxxxxx Date: Wednesday, 17 June, 2009, 5:57 AM hi this is my class for login class login{ public $currentUser; private $_uname , $_password; function setData($uname, $pass){ require_once' safeworld. php'; $obj= new safeworld; $this->_uname = $obj->safeString( $uname); $this->_password = $obj->safeString( $pass); } function doLogin(){ $query_string = "SELECT id FROM users WHERE username = '".$this->_uname. "' and password = '".$this->_password ."'"; $q = mysql_query( $query_string) ; if(mysql_num_ rows($q)< 1){ throw new Exception("incorrec t data"); }else{ $this->setSession( 'admin'); } } protected function setSession($ meen){ $_SESSION['is_ logged']= true; $_SESSION['meen' ]= $meen; } } function isLoggedin($ meen){ //if(isset($ _SESSION[ 'is_logged' ])){ echo "ssssssssssssssss" ; // $this->currentUser = $meen; //return true; //}else{ //return false; //} } function sentData(){ if(isset($_POST[ 'username' ]) and isset($_POST[ 'password' ])){ return true; }else{ return false; } } and this is the implementation <? //here //are //some //comments //only for the line number require_once "classes/login. php"; $obj = new login; if(!$obj->isLoggedi n('admin' )){ if($obj->sentData( )){ $this->setData( $_POST['username '],$_POST[ 'password' ]); $this->doLogin( ); }else{ require_once( "../templates/ loginForm. php"); } }else{ header("Location: admin.php" ); } ?> and this is the result Fatal error: Call to undefined method login::isLoggedin( ) in C:\xampp\htdocs\ 5iblog\login. php on line 10 as you can see the method is defined although the error message !! Own a website.Get an unlimited package.Pay next to nothing.*Go to http://in.business.yahoo.com/ [Non-text portions of this message have been removed]