help creating a domain ban list in PHP

I have a list of domains I want to use as a ban list.


The file for the ban list contains domains like:

yahoo.com
google.com


I want to compare those names in the banlist with $_SERVER['HTTP_REFERER']

and if they exist in both the server variable and the banlist file...set a new variable called $dontadd to = 1.

The problem I am having is that the domain I want to check against in $_SERVER['HTTP_REFERER'] may have extra data in it like www.domain.com or worse www.foo.domains.com or even trailing info after the domain.

Can you guys help me out to only match a domain that was contained in my ban list?

Here is my clumsy code so far.

$banlist = "http://$siteurl/banlist";
$domain  = $_SERVER['HTTP_REFERER'];
$domain = str_replace('http://', '', $domain );
$domain = str_replace('/', '', $domain );$domain = "/^$domain/";
$fcg = file_get_contents($banlist);
if (preg_match($domain,$fcg)){
$dontadd ='1';

Code (markup):

...which works but it's not fool proof.

any ideas how to make it fool proof or close to it?

Thanks in advance!

 

$parse = parse_url($_SERVER['HTTP_REFERER'], PHP_URL_HOST);

$banned = file('banlist.txt');

foreach ($banned as $line) {
	if (stripos($parse, $line)) 
		$dontadd = 1;
}

PHP:

Try that (untested). It should work well enough unless they come from a site like www.google.com.notbannedsite.com, which is unlikely.

 

why dont you just make an array out of the domains? and then check if is in_array();

 

deception:

No matter what I try with your code $dontadd is always = to 1

It seems as if it counts a line even when there is none.

Any other ideas?

 

phantom: It should work. I think the file() is not reading in the array properly. As it sometimes does to me. Try to just do an array instead.

$parse = parse_url($_SERVER['HTTP_REFERER'], PHP_URL_HOST);
$banned = array('site.com','site2.com','site3.com');
$skip = false;

/* The way to do it with the in_array thingy
if (in_array($parse, $banned)) 
{
  $skip = true;
}
*/

foreach ($banned as $line) 
{
    if (stripos($parse, $line) !== false)
    {
        $skip = true; 
        break;
    }
}

PHP: