Domain name validator - backwards??

[rptasiuk]

I know almost nothing on PHP, but am I ever learning fast deugging this project.

I have this application that I download. Using my VB skills, I cleaned up all the bugs but one, and for the life of me I can't figure it out. The attached routine is supposed to strip off the .com (or any suffix) from a domain name entered into a search field. Logically (using my VB skills) it looks like it should work; however, it strips off the domain part and leaves the suffix. Backwards from what is intended. Could someone please point out where the logic is skewed??

function Check_Domain_Format()
{
if (empty($this->domain)) Error_Handle(LANG_ERR_no_domain);

    while (substr($this->domain, -1) == ".")
    {
        $this->domain = substr($this->domain, 0, -1);
    }

    $tdomain = strrchr($this->domain, ".");
    if($tdomain)
        $this->domain = substr($tdomain, 1);
    $this->domain = ereg_replace("[^a-zA-Z0-9-]*([a-zA-Z0-9-]*)[^a-zA-Z0-9-]*", "\\1", $this->domain);

    if (empty($this->domain)) Error_Handle(LANG_ERR_no_domain);
    if (strlen($this->domain.$this->ext) > 67) Error_Handle(LANG_ERR_too_long);
}

😉

[mrhappiness]

if you just want to strip the topleveldomain try

echo preg_replace('%\\.(com|net|de)$%i', '', 'a.b.c.com');
echo preg_replace('%\\.[a-z]{2,6}$%i', '', 'a.b.c.com');

first one list all domains you want to strip

second one strips every top level domain with at least 2 charcaters length and not longer than 6 characters

[rptasiuk]

Thanks to all that have read my post...

The solution is much simpler.
I simply replaced the loop with the following:

$domain = explode(".",$this->domain);
$this->domain = $domain[0];

It now works. Unfortunately, there is no contact info of the author to let him/her know of the fix.

[mrhappiness]

one of my freespace sites is located at mitglied.lycos.de

your code will return mitglied
my code will return mitglied.lycos

and www.phpforum.com will result in www

depends on what exactly you want

[rptasiuk]

ahh, good point.

It is used for a whois lookup; therefore must strip all subdomains and suffixes. In the case of your site, mitglied.lycos.de, I would want it stripped to "lycos", as that is the domain to be looked up. The suffix is chosen by a combobox that contains only the domain registrations we offer.

Your suggestions will do the suffix part, I will figure from that how to do the subdomains... I need to learn 😉