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 | } |
