[SOLVED] Stripping subdomain from url

[wwfc_barmy_army]

Hello.

 

I have a form for where a domain is submitted. Although i only need the base domain so no subdomains.

 

I'm guessing it will be some kind of str_replace or preg_match but i'm unsure what it would be.

 

So if for example mail.google.com was submitted the value i want is google.com, and if google.com is submitted i want google.com.

 

Thanks for any advice/code.

[phpdragon]

<?php $test="mail.google.com";

$break=explode('.', $test);

$result=$break[1]."."$break[2];

echo $result;

?>

 

edit: this only works for first level domains tho I have to look up the other way of doing it thats a bit more reliable

[thebadbad]

Have a look at parse_url().

 

Edit: Actually, it doesn't seem like the host-only is returned by that function. Using explode():

 

<?php
$str = 'mail.google.com';
$parts = array_reverse(explode('.', $str));
$host = "{$parts[1]}.{$parts[0]}";
?>

By reversing the array we get around the problem phpdragon ran into.

[phpdragon]

This seems to work ok

 

<?php $test="mail.google.com.au";
$break=explode('.', $test);
if (isset($break[3])) { $result="$break[1].$break[2].$break[3]"; } else { $result="$break[1].$break[2]"; }
echo $result;
?>

[thebadbad]

Oh, forgot the 'double' TLDs. I was only accounting for sub-sub domains like http://forum.developers.facebook.com/.