постраничный вывод для вызова $modx->runSnippet('Ditto'

...
$D=$modx->runSnippet('Ditto', array( 'startID'=>'49', 'documents'=>$documents, 'tpl'=>'DittoList', 'hideFolders'=>'1', 'paginate'=>'1', 'summarize'=>'2', 'paginateAlwaysShowLinks'=>'1', 'filter'=>$Filtr_string));  
$modx->setPlaceholder('search_rezult',$D);

$pages = '<div id="ditto_pages"> [+previous+] [+pages+] [+next+] </div>';
$modx->setPlaceholder('search_rezult2',$pages);

session_start();
$where = mysql_escape_string($_POST['where']);
$how = mysql_escape_string($_POST['how']);
...
$_SESSION['searching']['where']=$where; 
$_SESSION['searching']['how']=$how; 
... 
header( 'Location: '.$_SERVER['QUERY_STRING'] );

session_start();
if(isset($_POST['where'])&&isset($_POST['how'])){
  $_SESSION['searching']['where'] = mysql_escape_string($_POST['where']);
  $_SESSION['searching']['how']= mysql_escape_string($_POST['how']);
  header( 'Location: '.$_SERVER['REQUEST_URI'] );
}

if(isset($_SESSION['searching']['where'])&&isset($_SESSION['searching']['how'])){
  $Filtr_string = $_SESSION['searching']['where'].",".$_SESSION['searching']['how'];

  $modx->runSnippet('Ditto', array(...'filter'=>$Filtr_string...);
  .........
}