php HTTP_REFERER函数的使用用法
利用php的http_referer函数来判断用户的来路,这是简单了,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>下面我们让用户不知道我们的来路处理,实例代码如下:
<?php $host = "HdhCmsTestphpfensi测试数据" ; $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" ; //开源代码phpfensi测试数据 }这不就行了?
不过很奇怪的是,HdhCmsTestphpfensi测试数据 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 = "HdhCmsTestphpfensi测试数据" ; $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:
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 = 'http://HdhCmsTestphpfensi测试数据' ; //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" ]; ?>查看更多关于php HTTP_REFERER函数的使用用法 - php函数的详细内容...
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