Facebook API，PHP SDK getRequestForNextPage（）

Question

i'm developing a web app (with PHP SDK) that basically take user posts of last year and do some kind of analysis on it. Untill now i used to load the data with a recursive function that everytime get the content from the paging link and call itself again with that data. i've just discovered that i can use getRequestForNextPage(); so im tring to use this function but i got some troubles , seems that getRequestForNextPage() do not respect request's parameters. I know my explanation is pretty confused, here a simplified version of my code:

$thedate= strtotime('now ,-1 year');
$today = strtotime('now');
$richiesta ="/me/posts?since=".$thedate."&until=".$today;
$request = new FacebookRequest(  // richiedo i miei statuses
$session,
 'GET',
 $richiesta
 );
$respons = $request->execute();
function looper($response){     
    $graphObject = $response->getGraphObject();             
    $nextPageRequest = $response->getRequestForNextPage();
    $respy = $nextPageRequest->execute();       
    $x = $graphObject->getProperty('data');
    $y = $x->asArray(); 
    $counter = 0 ;      
    foreach ($y as $el){
        //do something                      
    }   

    if ( $respy != false ){ 
        looper($respy);
    } else {                
        return;
    }
}

looper($respons);`

it seems that that function just keep to iterate even if the posts are older than 1 year. do getRequestForNextPage() just dont care about request parameters? it just check if there is a "next" paging link in the graph object? Thanks in advance for any suggestion