浏览器如何弹出下载框

    //定义编码  
    header( ‘Content-Type:text/html;charset=utf-8 ‘);  
      
    //Atom  
    header(‘Content-type: application/atom+xml‘);  
      
    //CSS  
    header(‘Content-type: text/css‘);  
      
    //Javascript  
    header(‘Content-type: text/javascript‘);  
      
    //JPEG Image  
    header(‘Content-type: image/jpeg‘);  
      
    //JSON  
    header(‘Content-type: application/json‘);  
      
    //PDF  
    header(‘Content-type: application/pdf‘);  
      
    //RSS  
    header(‘Content-Type: application/rss+xml; charset=ISO-8859-1‘);  
      
    //Text (Plain)  
    header(‘Content-type: text/plain‘);  
      
    //XML  
    header(‘Content-type: text/xml‘);  
      
    // ok  
    header(‘HTTP/1.1 200 OK‘);  
      
    //设置一个404头:  
    header(‘HTTP/1.1 404 Not Found‘);  
      
    //设置地址被永久的重定向  
    header(‘HTTP/1.1 301 Moved Permanently‘);  
      
    //转到一个新地址  
    header(‘Location: http://www.example.org/‘);  
      
    //文件延迟转向:  
    header(‘Refresh: 10; url=http://www.example.org/‘);  
    print ‘You will be redirected in 10 seconds‘;  
      
    //当然，也可以使用html语法实现  
    // <meta http-equiv="refresh" content="10;http://www.example.org/ />  
      
    // override X-Powered-By: PHP:  
    header(‘X-Powered-By: PHP/4.4.0‘);  
    header(‘X-Powered-By: Brain/0.6b‘);  
      
    //文档语言  
    header(‘Content-language: en‘);  
      
    //告诉浏览器最后一次修改时间  
    $time = time() - 60; // or filemtime($fn), etc  
    header(‘Last-Modified: ‘.gmdate(‘D, d M Y H:i:s‘, $time).‘ GMT‘);  
      
    //告诉浏览器文档内容没有发生改变  
    header(‘HTTP/1.1 304 Not Modified‘);  
      
    //设置内容长度  
    header(‘Content-Length: 1234‘);  
      
    //设置为一个下载类型  
    header(‘Content-Type: application/octet-stream‘);  
    header(‘Content-Disposition: attachment; filename="example.zip"‘);  
    header(‘Content-Transfer-Encoding: binary‘);  
    // load the file to send:  
    readfile(‘example.zip‘);  
      
    // 对当前文档禁用缓存  
    header(‘Cache-Control: no-cache, no-store, max-age=0, must-revalidate‘);  
    header(‘Expires: Mon, 26 Jul 1997 05:00:00 GMT‘); // Date in the past  
    header(‘Pragma: no-cache‘);  
      
    //设置内容类型:  
    header(‘Content-Type: text/html; charset=iso-8859-1‘);  
    header(‘Content-Type: text/html; charset=utf-8‘);  
    header(‘Content-Type: text/plain‘); //纯文本格式  
    header(‘Content-Type: image/jpeg‘); //JPG***  
    header(‘Content-Type: application/zip‘); // ZIP文件  
    header(‘Content-Type: application/pdf‘); // PDF文件  
    header(‘Content-Type: audio/mpeg‘); // 音频文件  
    header(‘Content-Type: application/x-shockw**e-flash‘); //Flash动画  
      
    //显示登陆对话框  
    header(‘HTTP/1.1 401 Unauthorized‘);  
    header(‘WWW-Authenticate: Basic realm="Top Secret"‘);  
    print ‘Text that will be displayed if the user hits cancel or ‘;  
    print ‘enters wrong login data‘;  

    $filename = rtrim($_SERVER[‘DOCUMENT_ROOT‘],‘/‘).‘/app/files/payment_status.csv‘;  
    header(‘Content-Disposition: attachment; filename=payment_status.xlsx‘);  
    header(‘Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet‘);  
    header(‘Content-Length: ‘ . filesize($filename));  
    header(‘Content-Transfer-Encoding: binary‘);  
    header(‘Cache-Control: must-revalidate‘);  
    header(‘Pragma: public‘);  
    readfile($filename);