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Homephp教程php手册PHP实现读取远程文件功能

 

在昨天做端口测试的基础上研究一下PHP上传与下载的代码,结果想起前段时间笔试题有一道题是在上传文件时显示文件内容,让我对PHP实现读取远程文件的功能很感兴趣,以下是代码:

01 function urlfopen($url, $limit = 0, $post = '', $cookie = '', $bysocket = FALSE  , $ip = '', $timeout = 15, $block = TRUE, $encodetype  = 'URLENCODE') {

02           $return = '';

03           $matches = parse_url($url);

04           $host = $matches['host'];

05           $path = $matches['path'] ? $matches['path'].(isset($matches['query']) ? '?'.$matches['query'] : '') : '/';

06           $port = !empty($matches['port']) ? $matches['port'] : 80;

07  

08           if($post) {

09             $out = "POST $path HTTP/1.0\r\n";

10             $out .= "Accept: */*\r\n";

11             $out .= "Accept-Language: zh-cn\r\n";

12             $boundary = $encodetype == 'URLENCODE' ? '' : ';'.substr($post, 0, trim(strpos($post, "\n")));

13             $out .= $encodetype == 'URLENCODE' ? "Content-Type: application/x-www-form-urlencoded\r\n" : "Content-Type: multipart/form-data$boundary\r\n";

14             $out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";

15             $out .= "Host: $host\r\n";

16             $out .= 'Content-Length: '.strlen($post)."\r\n";

17             $out .= "Connection: Close\r\n";

18             $out .= "Cache-Control: no-cache\r\n";

19             $out .= "Cookie: $cookie\r\n\r\n";

20             $out .= $post;

21           } else {

22             $out = "GET $path HTTP/1.0\r\n";

23             $out .= "Accept: */*\r\n";

24             $out .= "Accept-Language: zh-cn\r\n";

25             $out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";

26             $out .= "Host: $host\r\n";

27             $out .= "Referer: \r\n";

28             $out .= "Connection: Close\r\n";

29             $out .= "Cookie: $cookie\r\n\r\n";

30           }

31           $fp = @fsockopen(($ip ? $ip : $host), $port, $errno, $errstr,$timeout);

32           if(!$fp) {

33             return '';

34           } else {

35             stream_set_blocking($fp, $block);

36             stream_set_timeout($fp, $timeout);

37             @fwrite($fp, $out);

38             $status = stream_get_meta_data($fp);

39             if(!$status['timed_out']) {

40               while (!feof($fp)) {

41                 if(($header = @fgets($fp)) && ($header == "\r\n"   $header =="\n")) {

42                   break;

43                 }

44               }

45  

46               $stop = false;

47               while(!feof($fp) && !$stop) {

48                 $data = fread($fp, ($limit == 0  $limit > 8192 ? 8192 :$limit));

49                 $return .= $data;

50                 if($limit) {

51                   $limit -= strlen($data);

52                   $stop = $limit 

53                 }

54               }

55             }

56             @fclose($fp);

57             return $return;

58           }

59         }



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