On 6/7/07, Robin Vickery <robinv@xxxxxxxxx> wrote:
On 06/06/07, Brad Fuller <bfuller@xxxxxxxxxxxxxxxx> wrote: > Daniel Brown wrote: > > On 6/6/07, Brad Fuller <bfuller@xxxxxxxxxxxxxxxx> wrote: > >> > >> I need to strip out a domain name from a URL, and ignore subdomains > >> (like www) > >> > >> I can use parse_url to get the hostname. And my first thought was to > >> take the last 2 segments of the hostname to get the domain. > > So if the > >> URL is http://www.example.com/ > >> Then the domain is "example.com." If the URL is > >> http://example.org/ then the domain is "example.org." > >> > >> This seemed to work perfectly until I come across a URL like > >> http://www.example.co.uk/ My script thinks the domain is "co.uk." > >> > >> So I added a bit of code to account for this, basically if the 2nd to > >> last segment of the hostname is "co" then take the last 3 segments. > >> > >> Then I stumbled across a URL like http://www.example.com.au/ > >> > >> So it occurred to me that this is not the best solution, unless I > >> have a definitive list of all exceptions to go off of. > >> > >> Does anyone have any suggestions? > >> > >> Any advice is much appreciated. > > > > Well, it's not very clean, but if you just need to remove > > the subdomain/CNAME from the domain.... > > > > <? > > $hostname = parse_url($_SERVER['SERVER_NAME']); > > $domsplit = explode('.',$hostname['path']); > > for($i=1;$i<count($domsplit);$i++) { > > $i == (count($domsplit) - 1) ? $domain .= $domsplit[$i] : > > $domain .= $domsplit[$i]."."; } > > echo $domain; > >> > > > > There's probably a much better way to do it, but in the > > interest of a quick response, that's one way. > > > Yes, that's basically what my code already does. > > The problem is that what if the url is "http://yahoo.co.uk/"; (note the lack > of a subdomain) > > Your script thinks that the domain is "co.uk". Just like my existing code > does. > > So we can't count on taking the last 2 segments. And we can't count on > ignoring the first segment. (The subdomain could be anything, not just www) In that case you can't do it just by parsing alone, you need to use DNS. <?php function get_domain ($hostname) { dns_get_record($hostname, DNS_A, $authns, $addt); return $authns[0]['host']; } print get_domain("www.google.com") . "\n"; print get_domain("google.com") . "\n"; print get_domain("www.google.co.uk") . "\n"; print get_domain("google.co.uk") . "\n"; print get_domain("google.co.uk") . "\n"; print get_domain("google.com.au") . "\n"; print get_domain("www.google.com.au") . "\n"; /* result google.com google.com google.co.uk google.co.uk google.co.uk google.com.au google.com.au */ ?> -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Wow.... great job, Robin.... I didn't even know about the dns_get_record() function myself until just now. I can actually think of a few places to use that now.... email validation, for one. -- Daniel P. Brown [office] (570-) 587-7080 Ext. 272 [mobile] (570-) 766-8107 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
