Remove domain extension

Question

So let's say I have just-a.domain.com,just-a-domain.info,just.a-domain.net how can I remove the extension .com,.net.info ... and I need the resultes in two variables one with the domain name and another one with the extension.

I tried with str_replace but doesn't work, I guess only with regex....

What parts should www.google.co.uk return? – Matthew Oct 04 '10 at 07:28 — Matthew, Oct 04 '10 at 07:28

Joyce Babu · Answer 1 · 2015-12-08T05:46:04.133

  preg_match('/(.*?)((?:\.co)?.[a-z]{2,4})$/i', $domain, $matches);

$matches[1] will have the domain and $matches[2] will have the extension

<?php

$domains = array("google.com", "google.in", "google.co.in", "google.info", "analytics.google.com");

foreach($domains as $domain){
  preg_match('/(.*?)((?:\.co)?.[a-z]{2,4})$/i', $domain, $matches);
  print_r($matches);
}
?>

Will produce the output

Array
(
    [0] => google.com
    [1] => google
    [2] => .com
)
Array
(
    [0] => google.in
    [1] => google
    [2] => .in
)
Array
(
    [0] => google.co.in
    [1] => google
    [2] => .co.in
)
Array
(
    [0] => google.info
    [1] => google
    [2] => .info
)
Array
(
    [0] => analytics.google.com
    [1] => analytics.google
    [2] => .com
)

score 10 · Accepted Answer · edited Dec 24 '13 at 14:23

10

$subject = 'just-a.domain.com';
$result = preg_split('/(?=\.[^.]+$)/', $subject);

This produces the following array

$result[0] == 'just-a.domain';
$result[1] == '.com';

edited Dec 24 '13 at 14:23

HamZa

14,671
11
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answered Oct 04 '10 at 07:31

splash

13,037
1
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67

works, but only for domains with one DOT in the extension. E.g. for ".com.br" it won't work. – almo Sep 04 '14 at 19:51
@almo Get the result using the script then again split the result :) – Sandeep Pattanaik Jul 28 '15 at 06:33

Gumbo · Answer 3 · 2010-10-04T08:52:36.650

If you want to remove the part of the domain that is administrated by domain name registrars, you will need to use a list of such suffixes like the Public Suffix List.

But since a walk through this list and testing the suffix on the domain name is not that efficient, rather use this list only to build an index like this:

$tlds = array(
    // ac : http://en.wikipedia.org/wiki/.ac
    'ac',
    'com.ac',
    'edu.ac',
    'gov.ac',
    'net.ac',
    'mil.ac',
    'org.ac',
    // ad : http://en.wikipedia.org/wiki/.ad
    'ad',
    'nom.ad',
    // …
);
$tldIndex = array_flip($tlds);

Searching for the best match would then go like this:

$levels = explode('.', $domain);
for ($length=1, $n=count($levels); $length<=$n; ++$length) {
    $suffix = implode('.', array_slice($levels, -$length));
    if (!isset($tldIndex[$suffix])) {
        $length--;
        break;
    }
}
$suffix = implode('.', array_slice($levels, -$length));
$prefix = substr($domain, 0, -strlen($suffix) - 1);

Or build a tree that represents the hierarchy of the domain name levels as follows:

$tldTree = array(
    // ac : http://en.wikipedia.org/wiki/.ac
    'ac' => array(
        'com' => true,
        'edu' => true,
        'gov' => true,
        'net' => true,
        'mil' => true,
        'org' => true,
     ),
     // ad : http://en.wikipedia.org/wiki/.ad
     'ad' => array(
        'nom' => true,
     ),
     // …
);

Then you can use the following to find the match:

$levels = explode('.', $domain);
$r = &$tldTree;
$length = 0;
foreach (array_reverse($levels) as $level) {
    if (isset($r[$level])) {
        $r = &$r[$level];
        $length++;
    } else {
        break;
    }
}
$suffix = implode('.', array_slice($levels, - $length));
$prefix = substr($domain, 0, -strlen($suffix) - 1);

score 2 · Answer 4 · edited Mar 07 '17 at 09:48

Regex and parse_url() aren't solution for you.

You need package that uses Public Suffix List, only in this way you can correctly extract domains with two-, third-level TLDs (co.uk, a.bg, b.bg, etc.). I recomend use TLD Extract.

Here example of code:

$extract = new LayerShifter\TLDExtract\Extract();

$result = $extract->parse('just.a-domain.net');
$result->getSubdomain(); // will return (string) 'just'
$result->getHostname(); // will return (string) 'a-domain'
$result->getSuffix(); // will return (string) 'net'
$result->getRegistrableDomain(); // will return (string) 'a-domain.net'

score -1 · Answer 5 · answered Oct 04 '10 at 07:30

-1

strrpos($str, ".")

Will give you the index for the last period in your string, then you can use substr() with the index and return the short string.

answered Oct 04 '10 at 07:30

Ólafur Waage

68,817
22
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Remove domain extension

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