利用php教程的http_referer函数来判断用户的来路，这是简单了，
实例

            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!

下面我们让用户不知道我们的来路处理
实例

]$host = "www.123cha.com";
	$referer = "http://".$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";
	}[/code]
	这不就行了?
	不过很奇怪的是,
	www.hao123.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?
	[code]$host = "www.zhutiai.com";
	$html = file_get_contents("http://".$host);
	$fp = file_put_contents("hao123.html",$html);
	echo "done";
	?>;[/code]

但这样抓的就没问题.

再来分析开始抓的http头
[code]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[/code]

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.

实例二

$host = '127.0.0.1';
	$target = '/2.php';
	$referer = 'http://www.phprm.com'; //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：

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

永久链接：http://www.phprm.com/function/php1004630.html

转载随意！带上文章地址吧。