php模仿使用者訪問網頁程式碼

function httpget( $url, $followredirects=true ) {  global $final_url;  $url_parsed = parse_url($url);  if ( emptyempty($url_parsed['scheme']) ) {      $url_parsed = parse_url('http://'.$url);  }  $final_url = $url_parsed;    $port = $url_parsed["port"];  if ( !$port ) {      $port = 80; //www.php.cn}  $rtn['url']['port'] = $port;    $path = $url_parsed["path"];  if ( emptyempty($path) ) {      $path="/";  }  if ( !emptyempty($url_parsed["query"]) ) {      $path .= "?".$url_parsed["query"];  }  $rtn['url']['path'] = $path;    $host = $url_parsed["host"];  $foundbody = false;    $out = "get $path http/1.0 ";  $out .= "host: $host ";  $out .= "user-agent:      mozilla/5.0 (windows; u; windows nt 5.1; en-us; rv:1.8.1) gecko/20061010 firefox/2.0 ";  $out .= "connection: close ";    if ( !$fp = @fsockopen($host, $port, $errno, $errstr, 30) ) {      $rtn['errornumber'] = $errno;      $rtn['errorstring'] = $errstr;    }  fwrite($fp, $out);  while (!@feof($fp)) {        $s = @fgets($fp, 128);      if ( $s == " " ) {          $foundbody = true;          continue;      }      if ( $foundbody ) {          $body .= $s;      } else {          if ( ($followredirects) && (stristr($s, "location:") != false) ) {              $redirect = preg_replace("/location:/i", "", $s);              return httpget( trim($redirect) );          }          $header .= $s;      }  }    fclose($fp);    return(trim($body));

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