如何让PHP代码实现自动弹出浏览器下载文件对话框？

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php路径设置：$library_path=dirname(dirname(dirname(dirname(__FILE__)))) . /library/file/;文件路径：$file=$library_path . ip_library_ok.txt;响应头：header('Content-Description: File Transfer');header('Content-Type: application/octet-stream');

$library_path = dirname(dirname(dirname(dirname(__FILE__))))."/library/file/"; $file = $library_path."ip_library_ok.txt"; header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename='.basename($file)); header('Content-Transfer-Encoding: binary'); header('Expires: 0'); header('Cache-Control: must-revalidate'); header('Pragma: public'); header('Content-Length: ' . filesize($file)); ob_clean(); flush(); readfile($file);