How to use the php HTTP_REFERER function_PHP tutorial

​

Use the http_referer function in the PHP tutorial to determine where the user is coming from. This is easy,
Example

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!

Now we let users not know our origin
Example

]$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]

Isn’t this enough?

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

[code]$host = "www.zhutiai.com";
$html = file_get_contents("http://".$host);
$fp = file_put_contents("hao123.html",$html);
echo "done";
?>;[/code]

But there’s no problem if you catch it this way.

Let’s analyze the http header we started to capture
[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]

As expected, there is this sentence, Content-Encoding: gzip
It turned out to be compressed and has a length of 14567 bytes,
Using the second method to capture, the original uncompressed html is 71143 bytes, and it turns out that file_get_contents can also automatically decompress.

Example 2

$host = '127.0.0.1';
$target = '/2.php';
$referer = 'http://www.bkjia.com'; //Fake 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);
}
?>

The other 2.php file is very simple, just write a line of code to read the current HTTP_REFERER server value, as follows:

echo "

---

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