string comparsion

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Hi,

I need to check an domain or sub-domain against a list of domain names like

blocked domain = domainname.com

domain to check = sub1.domainname.com or www.domainname.com

I thought about string handling... but I don't get it for the moment... please point where do I have to start...

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If you can parse the domains for the tlds only, then you can use the in_array() function to search in the tlds.

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that's what I have now:

Code:

<?php
$blacklisted[] = "yoursite.com";
$ref_parts = parse_url($_SERVER['HTTP_REFERER']);
if (in_array($ref_parts['host'], $blacklisted)) {
// do somthing
}

now it works fine for yoursite.com but no for sub.yoursite.com, I want to block the whole domain...

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That code will work this way too. The ['host'] key keeps the whole domain.

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yes, but I want to have one blocked entry (domain.com)
but I want to check for all sub domains too

but only if there is no www in front of the blocked entry

the host variable can hold both www.domain.com or only domain.com

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This way you will produce some overhead

You will have to strpos() foreach() $domain in the list

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I think thats the solution:

Code:

<?php
$blacklisted[] = "domain.org";

function check_against_array($host) {
global $blacklisted;
if (in_array($host, $blacklisted)) {
return true;
}
foreach ($blacklisted as $val) {
if ($val == substr($host, strpos($host, $val))) {
return true;
}
}
return false;
}

function test_black_listed($url) {
$full_url = "http://".ltrim($url, "http://");
$url_parts = parse_url($full_url);
if (!empty($_SERVER['HTTP_REFERER'])) {
$ref_parts = parse_url($_SERVER['HTTP_REFERER']);
return check_against_array($ref_parts['host']);
}
return check_against_array($url_parts['host']);
}

if (test_black_listed("www.domain.org")) echo "got www.domain.org";
echo "<br>";
if (test_black_listed("domain.org")) echo "and got domain.org";

Nick,
I think you are using a similar function with your referer spam script or not?

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I think you can replace this:

if ($val == substr($host, strpos($host, $val))) {
return true;
}

with

if ( !(strpos($host, $val) === false))
return true;

[Free WordPress Themes]

I think you can replace this:

if ($val == substr($host, strpos($host, $val))) {
return true;
}

with

if ( !(strpos($host, $val) === false))
return true;

Right, it works the same, but is this much better/faster?

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Yeah it is much faster.

Try a benchmark to see.

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OK thanks, I saw this function before but it's hard to understand as non-programmer

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