joomla 1.7 user registration customization issue

-> i want to try new user registration customization.

-> for that i create form and call hidden variable through function from controller.

-> in controller save function i write this code but some function which not work in 1.7 so create problem here.

function register_save()

{



    global $mainframe;

    $db =& JFactory::getDBO();

    // Check for request forgeries

    JRequest::checkToken() or jexit( 'Invalid Token' );



    //clean request

    $post = JRequest::get( 'post' );

    $post['username']   = JRequest::getVar('username', '', 'post', 'username');

    $post['password']   = JRequest::getVar('password', '', 'post', 'string', JREQUEST_ALLOWRAW);

    $post['password2']  = JRequest::getVar('password2', '', 'post', 'string', JREQUEST_ALLOWRAW);



    // get the redirect

    $return = JURI::base();



    // do a password safety check

    if(strlen($post['password']) || strlen($post['password2'])) { // so that "0" can be used as password e.g.

        if($post['password'] != $post['password2']) {

            $msg    = JText::_('PASSWORD NOT MATCH');

            // something is wrong. we are redirecting back to edit form.

            // TODO: HTTP_REFERER should be replaced with a base64 encoded form field in a later release

            $return = str_replace(array('"', '<', '>', "'"), '', @$_SERVER['HTTP_REFERER']);

            if (empty($return) || !JURI::isInternal($return)) {

                $return = JURI::base();

            }

            $this->setRedirect($return, $msg, 'error');

            return false;

        }

    }



    // Get required system objects

    $user       = clone(JFactory::getUser());

    $pathway = JFactory::getApplication();

    //$pathway  =& $mainframe->getPathway();

    $config     =& JFactory::getConfig();

    //print_r($config)."<br>";

    $authorize  =& JFactory::getACL();

    //print_r($authorize)."<br>";                /// some mistake here

    $newUsertype = 'Registered';



    // Bind the post array to the user object

    if (!$user->bind( JRequest::get('post'), 'usertype' )) {

        JError::raiseError( 500, $user->getError());

    }

    // Set some initial user values

    $user->set('id', 0);

    $user->set('usertype', $newUsertype);



    $user->set('gid', $authorize->get_group_id( '', $newUsertype, 'ARO' ));



    $date =& JFactory::getDate();

    $user->set('registerDate', $date->toMySQL());



    // If user activation is turned on, we need to set the activation information



        jimport('joomla.user.helper');

        $user->set('activation', JUtility::getHash( JUserHelper::genRandomPassword()) );

        $user->set('block', '1');



    // If there was an error with registration, set the message and display form



    if ( !$user->save() )

    {

        JError::raiseWarning('', JText::_( $user->getError()));

        $this->register();

        return false;

    }



        $obj1 = new stdClass();

        $obj1->userid = $user->id;

        $obj1->points = 0;

        $obj1->posted_on = $date->toMySQL();

        $obj1->avatar   = '';                               

        $obj1->thumb    = '';

        $obj1->params   = 'notifyEmailSystem=1

                            privacyProfileView=0

                            privacyPhotoView=0

                            privacyFriendsView=0

                            privacyVideoView=1

                            notifyEmailMessage=1

                            notifyEmailApps=1

                            notifyWallComment=0';

        $db->insertObject('#__community_users', $obj1, 'userid');



        $extra_field = array(1=>2,2=>3,3=>4,4=>6,5=>7,6=>8,7=>9,8=>10,9=>11,10=>12,11=>14,12=>15,13=>16);

        $i = 1;

        $obj2 = new stdClass();

        while($extra_field[$i] != "")

        {

            $obj2->id = '';

            $obj2->user_id  = $user->id;

            $obj2->field_id  = $extra_field[$i];

            $obj2->value = '';

            $db->insertObject('#__community_fields_values', $obj2, 'id');

            $i++;

        }                   

     ////////// end of joomsocial customisation///////////////////////////  

    // Send registration confirmation mail

    $password = JRequest::getString('password', '', 'post', JREQUEST_ALLOWRAW);

    $password = preg_replace('/[\x00-\x1F\x7F]/', '', $password); //Disallow control chars in the email

    UserControllerRegister::_sendMail($user, $password);



    // Everything went fine, set relevant message depending upon user activation state and display message



        $message  = JText::_( 'Your account has been created and an activation link has been sent to the e-mail address you entered. Note that you must activate the account by clicking on the activation link when you get the e-mail before you can login.' );



    $this->setRedirect('index.php', $message);

}

please help me.