PHP读取远程文件

function urlfopen($url, $limit = 0, $post = '', $cookie = '', $bysocket = FALSE  , $ip = '', $timeout = 15, $block = TRUE, $encodetype  = 'URLENCODE') {
          $return = '';
          $matches = parse_url($url);
          $host = $matches['host'];
          $path = $matches['path'] ? $matches['path'].(isset($matches['query']) ? '?'.$matches['query'] : '') : '/';
          $port = !empty($matches['port']) ? $matches['port'] : 80;

          if($post) {
            $out = "POST $path HTTP/1.0\r\n";
            $out .= "Accept: */*\r\n";
            $out .= "Accept-Language: zh-cn\r\n";
            $boundary = $encodetype == 'URLENCODE' ? '' : ';'.substr($post, 0, trim(strpos($post, "\n")));
            $out .= $encodetype == 'URLENCODE' ? "Content-Type: application/x-www-form-urlencoded\r\n" : "Content-Type: multipart/form-data$boundary\r\n";
            $out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
            $out .= "Host: $host\r\n";
            $out .= 'Content-Length: '.strlen($post)."\r\n";
            $out .= "Connection: Close\r\n";
            $out .= "Cache-Control: no-cache\r\n";
            $out .= "Cookie: $cookie\r\n\r\n";
            $out .= $post;
          } else {
            $out = "GET $path HTTP/1.0\r\n";
            $out .= "Accept: */*\r\n";
            $out .= "Accept-Language: zh-cn\r\n";
            $out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
            $out .= "Host: $host\r\n";
            $out .= "Referer: \r\n";
            $out .= "Connection: Close\r\n";
            $out .= "Cookie: $cookie\r\n\r\n";
          }
          $fp = @fsockopen(($ip ? $ip : $host), $port, $errno, $errstr, $timeout);
          if(!$fp) {
            return '';
          } else {
            stream_set_blocking($fp, $block);
            stream_set_timeout($fp, $timeout);
            @fwrite($fp, $out);
            $status = stream_get_meta_data($fp);
            if(!$status['timed_out']) {
              while (!feof($fp)) {
                if(($header = @fgets($fp)) && ($header == "\r\n" ||  $header == "\n")) {
                  break;
                }
              }

              $stop = false;
              while(!feof($fp) && !$stop) {
                $data = fread($fp, ($limit == 0 || $limit > 8192 ? 8192 : $limit));
                $return .= $data;
                if($limit) {
                  $limit -= strlen($data);
                  $stop = $limit <= 0;
                }
              }
            }
            @fclose($fp);
            return $return;
          }
        }

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