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:

<?php 

   if (isset($_SERVER['HTTP_REFERER'])) { 

     print "The page you were on previously was {$_SERVER['HTTP_REFERER']}<br />"; 

   } else { 

     print "You didn't click any links to get here<br />"; 

      } 

    ?> 

<a href="refer.php">Click me!</a>

下面是我们让用户不知道我们的来路处理,实例代码如下:

<?php 

$host = "3water.com"; 

$referer = "http://".$host; 

$fp = fsockopen ($host, 80, $errno, $errstr, 30); 

if (!$fp){ 

        echo "$errstr ($errno)<br>;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,3water.com 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?

<?php 

$host = "3water.com"; 

$html = file_get_contents("http://".$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:

<?php 

$host = '127.0.0.1'; 

$target = '/2.php'; 

$referer = 'https://3water.com'; //伪造HTTP_REFERER地址 

$fp = fsockopen($host, 80, $errno, $errstr, 30); 

if (!$fp){ 

echo "$errstr($errno)<br />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:

<?php 

echo "<hr />"; 

echo $_SERVER["HTTP_REFERER"]; 

?>

希望本文所述对大家的php程序设计有所帮助。