Zend/Gdata/App/Feed.php
public function getPreviousFeed()
    {
        $previousLink = $this->getPreviousLink();
        if (!$previousLink) {
            require_once 'Zend/Gdata/App/HttpException.php';
            throw new Zend_Gdata_App_Exception('No link to previous set ' .
            'of results found.');
        }
        $previousLinkHref = $previousLink->getHref();
        $service = new Zend_Gdata_App($this->getHttpClient());

        return $service->getFeed($previousLinkHref, get_class($this));
    }
public function getPreviousFeed()
    {
        $previousLink = $this->getPreviousLink();
        if (!$previousLink) {
            require_once 'Zend/Gdata/App/HttpException.php';
            throw new Zend_Gdata_App_Exception('No link to previous set ' .
            'of results found.');
        }
        $previousLinkHref = $previousLink->getHref();
        $service = new Zend_Gdata_App($this->getHttpClient());

        return $service->getFeed($previousLinkHref, get_class($this));
    }
public function getPreviousFeed ( ) { $ previousLink = $ this -> getPreviousLink ( ) ; if ( ! $ previousLink ) { require_once 'Zend/Gdata/App/HttpException.php' ; throw new Zend_Gdata_App_Exception ( 'No link to previous set ' . 'of results found.' ) ; } $ previousLinkHref = $ previousLink -> getHref ( ) ; $ service = new Zend_Gdata_App ( $ this -> getHttpClient ( ) ) ; return $ service -> getFeed ( $ previousLinkHref , get_class ( $ this ) ) ; }
Retrieve the previous set of results from this feed.

@throws Zend_Gdata_App_Exception
@return mixed|null Returns the previous set of results as a feed of
the same class as this feed, or null if no results exist.
Retrieve the previous set of results from this feed .