文件rename（）函数工作但也抛出错误

Question

我试图重命名一个文件，当我调用rename（）函数时，文件get被重命名但它仍然给我错误＆＃34;文件名uploads / 09-12-2015.xls不可读＆ ＃34;

date_default_timezone_set('America/Chicago');

/** Include path **/
set_include_path(get_include_path() . PATH_SEPARATOR . '../../../Classes/');
include 'lib/Classes/PHPExcel/IOFactory.php';
/** PHPExcel_IOFactory */
include 'connect.php';

if (isset($_POST['config']))
{
    $hotelName = $_POST['shortname'];
    $reportDate = $_POST['reportDate'];
    $dateCol = $_POST['dateCol'];
    $dateRow = $_POST['dateRow'];
    $soldCol = $_POST['soldCol'];
    $revCol = $_POST['revCol'];
    $todayDate = date('m-d-Y');

    rename("uploads/$todayDate.xls","uploads/$reportDate.xls");
    echo "done";
    //$objPHPExcel = PHPExcel_IOFactory::load($inputFileName);  
    //$sheetData = $objPHPExcel->getActiveSheet()->toArray(null,true,true,true);

}