在CodeIgniter中强制PHPExcel下载不起作用

Question

I'm trying to download a excelsheet that has been generated with PHPExcel, being new to PHPExcel i've been trying to do this with the provided Example in the documentation. However I can't get the script to download for me, the only thing it does is outputting the following;

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I am using this script;

       <?php
class Excel extends MY_Controller {

        public function __construct()
        {
            parent::__construct();
            include(APPPATH.'libraries/Classes/PHPExcel.php');
            include(APPPATH.'libraries/Classes/PHPExcel/IOFactory.php');
            $this->load->helper('download');
        }

        public function exporteerFactuur()
        {   
            // Create new PHPExcel object
            $objPHPExcel = new PHPExcel();

            // Set document properties
            $objPHPExcel->getProperties()->setCreator("Maarten Balliauw")
                             ->setLastModifiedBy("Maarten Balliauw")
                             ->setTitle("Office 2007 XLSX Test Document")
                             ->setSubject("Office 2007 XLSX Test Document")
                             ->setDescription("Test document for Office 2007 XLSX, generated using PHP classes.")
                             ->setKeywords("office 2007 openxml php")
                             ->setCategory("Test result file");


            // Add some data
            $objPHPExcel->setActiveSheetIndex(0)
                        ->setCellValue('A1', 'Hello')
                        ->setCellValue('B2', 'world!')
                        ->setCellValue('C1', 'Hello')
                        ->setCellValue('D2', 'world!');

            // Miscellaneous glyphs, UTF-8
            $objPHPExcel->setActiveSheetIndex(0)
                        ->setCellValue('A4', 'aaa')
                        ->setCellValue('A5', 'aaa');

            // Rename worksheet
            $objPHPExcel->getActiveSheet()->setTitle('Simple');


            // Set active sheet index to the first sheet, so Excel opens this as the first sheet
            $objPHPExcel->setActiveSheetIndex(0);
            // Redirect output to a client’s web browser (Excel2007)
            header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
            header('Content-Disposition: attachment;filename="01simple.xlsx"');
            header('Cache-Control: max-age=0');
            // If you're serving to IE 9, then the following may be needed
            header('Cache-Control: max-age=1');

            // If you're serving to IE over SSL, then the following may be needed
            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

            $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
            $objWriter->save('php://output');
        }

        public function exporteer()
        {

        }
}

The function exporteerFactuur() get called with an AJAX request.

Answer 1

I would try the CodeIgniter Download Helper if the file is not too big, and you don't have memory constraints.

// The Download helper handles most of the HTTP headers but you could still send some if you like

header('Cache-Control: max-age=0');
// If you're serving to IE 9, then the following may be needed
header('Cache-Control: max-age=1');

// If you're serving to IE over SSL, then the following may be needed
header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT'); // always modified
header('Pragma: public'); // HTTP/1.0

// Load the download helper
$this->load->helper('download');

// Save and capture output (into PHP memory)
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
ob_start();
$objWriter->save('php://output');
$excelFileContents = ob_get_clean();

// Download file contents using CodeIgniter
force_download('01simple.xlsx', $excelFileContents);

If you'd prefer to do it all yourself, I would also add header("Content-Transfer-Encoding: binary"); and check the code for CodeIgniter's force_download to get a clue of which headers are sent by the helper.