Php HTTP_REFERER function usage

 

Using the http_referer function in the php tutorial to determine the user's path is simple,
Instance

If (isset ($ _ SERVER ['HTTP _ referer']) {
Print "The page you were on previusly was {$ _ SERVER ['HTTP _ referer']}
";
} Else {
Print "You didn't click any links to get here
";
}
?>

Click me!

Next, let the user not know how to handle it.
Instance

] $ 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]

That's not enough?

But the strange thing is,
Www.hao123.com
The page is garbled (except the http header). Why? Is it because gzip is used for compression?

[Code] $ Host = "www.zhutiai.com ";
$ Html = file_get_contents ("http: //". $ host );
$ Fp = file_put_contents ("hao123.html", $ html );
Echo "done ";
?>; [/Code]

But there is no problem with this.

Analyze the http Header
[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]

Sure enough, Content-Encoding: gzip
Originally compressed, with a length of 14567 bytes,
The second method is used to capture. The original uncompressed html is 71143 bytes. The original file_get_contents can also be automatically decompressed.

Instance 2

$ Host = '1970. 0.0.1 ';
$ Target = '/2. php ';
$ Referer = 'HTTP: // www.bkjia.com '; // forged HTTP_REFERER address
$ 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 );
}
?>

Another 2. php file is very simple. Just write a line of code to read the current HTTP_REFERER server value, as shown below:

Echo"

";
Echo $ _ SERVER ["HTTP_REFERER"];
?>