thinkphp导出excel表格

/**
 * 数组转xls格式的excel文件
 * @param  array  $data      需要生成excel文件的数组
 * @param  string $filename  生成的excel文件名
 *      示例数据：
        $data = array(
            array(NULL, 2010, 2011, 2012),
            array('Q1',   10,   11,   12),
            array('Q2',   20,   21,   22),
            array('Q3',   30,   31,   32),
            array('Q4',   40,   41,    42),
           );
 */
function createXls($data, $filename='simple.xls'){
    ini_set('max_execution_time', '0');
    Vendor('PHPExcel.PHPExcel');

    $filename=str_replace('.xls', '', $filename).'.xls';
    
    $phpexcel = new PHPExcel();
    $phpexcel->getProperties()
//      右键属性所显示的信息
        ->setCreator("By ShenYan") //作者
        ->setLastModifiedBy("By ShenYan") //最后一次保存者
        ->setTitle("excel")//标题
        ->setSubject("excel")//主题
        ->setDescription("excel")//描述
        ->setKeywords("excel php") //标记
        ->setCategory("result file"); //类别
    $phpexcel->getActiveSheet()->fromArray($data);
    $phpexcel->getActiveSheet()->setTitle('Sheet1');
    $phpexcel->setActiveSheetIndex(0);
    
    header('Content-Type: application/vnd.ms-excel');
    header("Content-Disposition: attachment;filename=$filename");
    header('Cache-Control: max-age=0');
    header('Cache-Control: max-age=1');
    header ('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
    header ('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT'); // always modified
    header ('Cache-Control: cache, must-revalidate'); // HTTP/1.1
    header ('Pragma: public'); // HTTP/1.0
    
    $objwriter = PHPExcel_IOFactory::createWriter($phpexcel, 'Excel5');
    $objwriter->save('php://output');
    
    exit;
}



public function excelDemo(){
    $header = array(
        array(NULL, 沈唁, 集成, Excel)
    );
    $orderinfo = array(
        array(1,2,3,4),
        array(5,6,7,8),
        array(1,3,5,7)
    );
    $data = array_merge($header,$orderinfo);
    createXls($data);
}