php下实现文件下载实现代码
文章介绍了利用php来实现读取文件并且下载的代码,php要下载文件必须用到header函数,大家可参考一下,代码如下:
- <?php
- $file = 'monkey.gif';
- if (file_exists($file)) {
- header('Content-Description: File Transfer');
- header('Content-Type: application/octet-stream');
- header('Content-Disposition: attachment; filename='.basename($file));
- header('Content-Transfer-Encoding: binary');
- header('Expires: 0');
- header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
- header('Pragma: public');
- header('Content-Length: ' . filesize($file));
- ob_clean();
- flush();
- readfile($file);
- exit;
- }
- ?>
以上代码是下载代码,接下来贴一段在线预览pdf文件的代码:
- <?php
- public function fddAction()
- {
- // get attachment location
- $attachment_location = $_SERVER["DOCUMENT_ROOT"] . "/pdf/fdd/sample.pdf";
- if (file_exists($attachment_location)) {
- // attachment exists
- // send open pdf dialog to user
- header('Cache-Control: public'); // needed for i.e.
- header('Content-Type: application/pdf');
- header('Content-Disposition: inline; filename="sample.pdf"');
- readfile($attachment_location);
- die(); // stop execution of further script because we are only outputting the pdf
- } else {
- die('Error: File not found.');
- }
- }
- ?>