php通过修改header强制图片下载的方法_PHP教程

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function downloadFile($file){

$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();

}