有时需要一些文件不能在线打开,而是执行后需要下载,这时就用这个函数就可以解决了
代码如下:
function downloadFile($file){
/*Coded by Alessio Delmonti*/
$file_name = $file;
$mime = 'application/force-download';
header('Pragma: public'); // required
header('Expires: 0'); // no cache
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Cache-Control: private',false);
header('Content-Type: '.$mime);
header('Content-Disposition: attachment; filename="'.basename($file_name).'"');
header('Content-Transfer-Encoding: binary');
header('Connection: close');
readfile($file_name); // push it out
exit();
}
php将文件下载下来而不是超链接下载,这样可以减少盗链的情况!将文件给浏览器让浏览器下载
以txt类型为例
由于现在的浏览器已经可以识别txt文档格式,如果只给txt文档做一个文字链接的话,点击后只是打开一个新窗口显示txt文件的内容,并不能实现点击下载的目的。当然这个问题的解决办法也可以是将txt文件改名为浏览器不认识的文件(比如rar),这样的话,由于浏览器不能识别rar类型的文件,只能让用户下载了。还有一种办法,就是利用代码通过header设置文档的格式来实现点击下载的目的。
PHP代码如下:
代码如下:
$filename = '/path/'.$_GET['file'].'.txt'; //文件路径
header("Content-Type: application/force-download");
header("Content-Disposition: attachment; filename=".basename($filename));
readfile($filename);
简要说明:
第一个header函数设置Content-Type的值为application/force-download;
第二个header函数设置要下载的文件。注意这里的filename是不包含路径的文件名,filename的值将来就是点击下载后弹出对话框里面的文件名,如果带路径的话,弹出对话框的文件名就是未知的;
最后通过readfile函数,将文件流输出到浏览器,这样就实现了txt文件的下载。

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