Identifying off-site links

[sssweb]

Is there an easy way to identify off-site links using php?

For example, on a forum site like webmasterworld.com, I'm looking for code to flag posts that contain:

[yahoo.com...]
www.yahoo.com

while ignoring:

[webmasterworld.com...]
www.webmasterworld.com

and relative URL's like:

/home.htm
/forum/index.php

[barns101]

Once you've isolated the URL, the following code, using strpos() [uk2.php.net], would work:

$posted_url = 'whatever you find in the post text';
$your_url = 'exmaple.com';
$pos = strpos($mystring, $findme);
if ($pos === false)
{
// It's an outside URL
}
else
{
// It's your URL
}

However, you would need some way to ignore relative links.

[sssweb]

Using your variables, I assume you mean:

$pos = strpos($posted_url, $your_url);

[barns101]

Yes, sorry! (I used the example from the PHP website but forgot to change that part! ;) )