ti andrebbe di seguirmi passo passo?

allora:

codice:
require_once 'Classes/PHPExcel.php';
/** Error reporting */ 
error_reporting(E_ALL);  
date_default_timezone_set('Europe/London');   
$file="prova.xlxs"; 
// Create new PHPExcel object 
echo date('H:i:s') . " Create new PHPExcel object\n"; 
$objPHPExcel = new PHPExcel();  

//create reader 
$objReader = PHPExcel_IOFactory::createReader($ext); 
//load file 
$objPHPExcel = $objReader->load($file);
 
//initiate excel datas 
$excel = array();  
$cellValue = true;  
$dim = $objPHPExcel->getActiveSheet()->calculateWorksheetDimension(); 
list($start, $end) = explode(':', $dim);
cosa passo alla funzione createReader($ext) ?????


grazie