这篇文章主要介绍了php中HTTP_REFERER函数用法,以实例的形式分别讲述了判断用户来路与伪造来路地址等应用,需要的朋友可以参考下

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:

复制代码 代码如下:

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

";

}

?>

Click me!

下面是我们让用户不知道我们的来路处理,实例代码如下:

复制代码 代码如下:

$host = "www.jb51.net";

$referer = "http://".$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: $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, 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?

复制代码 代码如下:

$host = "www.jb51.net";

$html = file_get_contents("http://".$host);

$fp = file_put_contents("hao123.html",$html);

echo "done";

?>;

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:

复制代码 代码如下:

$host = '127.0.0.1';

$target = '/2.php';

$referer = 'http://www.jb51.net'; //伪造HTTP_REFERER地址

$fp = fsockopen($host, 80, $errno, $errstr, 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:

复制代码 代码如下:

echo "";

echo $_SERVER["HTTP_REFERER"];

?>

希望本文所述对大家的php程序设计有所帮助。

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