php中HTTP_REFERER函数用法实例

本文实例分析了PHP中HTTP_REFERER函数用法。分享给大家供大家参考。具体分析如下：

利用PHP的http_referer函数来判断用户的来路,这是比较简单的,实例代码如下:

代码如下:

PHP if (isset($_SERVER['HTTP_REFERER'])) { print "The page you were on prevIoUsly was {$_SERVER['HTTP_REFERER']}
"; } else { print "You didn't click any links to get here
"; } ?>

下面是我们让用户不知道我们的来路处理,实例代码如下:

代码如下:

PHP $host = "www.jb51.cc"; $referer = "http://".$host; $fp = fsockopen ($host,80,$errno,$errstr,30); if (!$fp){ echo "$errstr ($errno)
;n"; }else{ $request = " GET / HTTP/1.1 Accept: image/gif,image/x-xbitmap,image/jpeg,image/pjpeg,application/x-shockwave-flash,application/vnd.ms-powerpoint,application/vnd.ms-excel,application/msword,*/"."* Referer: http://$host Accept-Language: zh-cn Accept-Encoding: gzip,deflate User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1) Host: $host Connection: Close" ."rnrn";

fputs ($fp,"$request");
while (!feof($fp))
{
$res[] = fgets($fp,1024);
}
$html = join("",$res);
fclose ($fp);
$fp = file_put_contents("123cha.html",$html);
echo "done";
}

这不就行了?

不过很奇怪的是,www.jb51.cc 的页面抓下来是乱码(除了http头),这是为什么?难道是因为用了gzip之类压缩?

代码如下:

;

但这样抓的就没问题,再来分析开始抓的http头:

HTTP/1.1 200 OK Date: Wed,31 Aug 2005 00:59:36 GMT Server: Apache/1.3.27 Cache-Control: max-age=1296000 Expires: Thu,15 Sep 2005 00:59:36 GMT Last-Modified: Mon,29 Aug 2005 13:56:00 GMT Accept-Ranges: bytes Connection: close Content-Type: text/html content-encoding: gzip Content-Length: 14567

果然有这句,content-encoding:gzip,原来压缩了的,长度14567字节了,用第二种方法抓,原来没压缩的html是71143字节,原来file_get_contents还可以自动解压缩.

PHP实例二,代码如下:

代码如下:

PHP $host = '127.0.0.1'; $target = '/2.PHP'; $referer = '//www.jb51.cc'; //伪造HTTP_REFERER地址 $fp = fsockopen($host,30); if (!$fp){ echo "$errstr($errno)
n"; } else{ $out = " GET $target HTTP/1.1 Host: $host Referer: $referer Connection: Closernrn"; fwrite($fp,$out); while (!feof($fp)){ echo fgets($fp,1024); } fclose($fp); } ?>

另一个2.PHP文件很简单,只是写上一行读取当前的HTTP_REFERER服务器值的代码即可,如下:

代码如下:

PHP echo "

---

"; echo $_SERVER["HTTP_REFERER"]; ?>

希望本文所述对大家的PHP程序设计有所帮助。