php支持多线程下载的例子

3. header("Cache-Control: public");

4. header("Accept-Ranges: bytes");

5. $file = "a.7z";

6. $filename = "a.7z";

7. $size=filesize($file);

8. $size1=$size-1;
9. //获得字节范围
10. if(isset($_SERVER['HTTP_RANGE'])) {
11. list($name, $range) = explode("=",$_SERVER['HTTP_RANGE']);
12. $length=$size1-$range;
13. header("HTTP/1.1 206 Partial Content"); //http协议头状态码,表示以部分内容传输
14. header("Content-Range: bytes ".$range."-".$size1."/".$size);
15. }else{
16. $length = $size;
17. }

18. header("Content-Length: $length");

19. header("Content-Type: application/octet-stream");
20. header("Content-Disposition: attachment; filename=".$filename);

21. $fp=fopen($file,"rb");

22. //设定文件指针位置

23. fseek($fp,$range);

24. while(!feof($fp)){

25. set_time_limit(0);
26. echo fread($fp,1024);
27. flush();
28. ob_flush();
29. }
30. fclose($fp);
31. exit;
32. ?>

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