PHP使用header方式实现文件下载功能

<&＃63;php
// 结果出错
// 在调用 header() 之前已存在输出
header('Location: http://www.example.com/');
&＃63;>

header(string,replace,http_response_code)

HTTP/1.1 200 OK
Server: Tengine
Content-Type: application/octet-stream
Content-Length: 5050697
Connection: keep-alive
Date: Thu, 12 Oct 2017 11:24:46 GMT
Accept-Ranges: bytes
Content-Disposition: attachment; filename=down/20170928/zjbb_2.9.5.apk
Expires: Thu, 12 Oct 2017 11:25:46 GMT
Cache-Control: max-age=60
Via: cache25.l2eu6-1[0,200-0,H], cache16.l2eu6-1[16,0], cache8.cn891[0,200-0,H], cache8.cn891[1,0]
Age: 1733678
X-Cache: HIT TCP_MEM_HIT dirn:6:277104755 mlen:-1
X-Swift-SaveTime: Sat, 14 Oct 2017 00:50:47 GMT
X-Swift-CacheTime: 93312000
Timing-Allow-Origin: *
EagleId: b73d0e1c15095411645886178e

header('HTTP/1.1 200 OK'); // ok 正常访问
header('HTTP/1.1 404 Not Found'); //通知浏览器 页面不存在
header('HTTP/1.1 301 Moved Permanently'); //设置地址被永久的重定向 301
header('Location: http://www.test.con/'); //跳转到一个新的地址
header('Refresh: 10; url=http://www.test.con/'); //延迟转向 也就是隔几秒跳转
header('X-Powered-By: PHP/7.0.0'); //修改 X-Powered-By信息
header('Content-language: en'); //文档语言
header('Content-Length: 1234'); //设置内容长度
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $time).' GMT'); //告诉浏览器最后一次修改时间
header('HTTP/1.1 304 Not Modified'); //告诉浏览器文档内容没有发生改变
###内容类型###
header('Content-Type: text/html; charset=utf-8'); //网页编码
header('Content-Type: text/plain'); //纯文本格式
header('Content-Type: image/jpeg'); //JPG、JPEG
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: text/css'); //css文件
header('Content-type: text/Javascript'); //js文件
header('Content-type: application/json'); //json
header('Content-type: application/pdf'); //pdf
header('Content-type: text/xml'); //xml
header('Content-Type: application/x-shockw**e-flash'); //Flash动画
######
###声明一个下载的文件###
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="ITblog.zip"');
header('Content-Transfer-Encoding: binary');
readfile('test.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');
######
###显示一个需要验证的登陆对话框###
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Top Secret"');
######
###声明一个需要下载的xls文件###
header('Content-Disposition: attachment; filename=abc.xlsx');
header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
header('Content-Length: '.filesize('./test.xls'));
header('Content-Transfer-Encoding: binary');
header('Cache-Control: must-revalidate');
header('Pragma: public');
readfile('./test.xls');

header("Content-type:application/octet-stream");
header("Accept-Ranges:bytes");
header("Accept-Length:".$file_Size);
header("Content-Disposition: attachment; filename=".$filename);

$filename=iconv("UTF-8","GB2312",$filename);

<&＃63;php
 ob_clean();
 $action = $_GET['action'];
 $filename = base64_decode($action);//传的参数encode了
 $filepath = '/data/www/www.test.com/'.$filename;
 if(!file_exists($filepath)){
  exit;
 }
 $fp=fopen($filepath,"r");
 $filesize=filesize($filepath);
 header("Content-type:application/octet-stream");
 header("Accept-Ranges:bytes");
 header("Accept-Length:".$filesize);
 header("Content-Disposition: attachment; filename=".$filename);
 $buffer=1024;
 $buffer_count=0;
 while(!feof($fp)&&$file_Size-$buffer_count>0){
 $data=fread($fp,$buffer);
 $buffer_count+=$buffer;
  echo $data;
 }
 fclose($fp);
&＃63;>

$file = $_GET['file'];
if(file_exists($file)){
header("Content-type:application/octet-stream");
$filename = basename($file);
header("Content-Disposition:attachment;filename = ".$filename);
header("Accept-ranges:bytes");
header("Accept-length:".filesize($file));
readfile($file);
}else{
  echo "";
}