PHP function to get the subdomain of a URL
PhpSubdomainPhp Problem Overview
Is there a function in PHP to get the name of the subdomain?
In the following example I would like to get the "en" part of the URL:
en.example.com
Php Solutions
Solution 1 - Php
Here's a one line solution:
array_shift((explode('.', $_SERVER['HTTP_HOST'])));
Or using your example:
array_shift((explode('.', 'en.example.com')));
EDIT: Fixed "only variables should be passed by reference" by adding double parenthesis.
EDIT 2: Starting from PHP 5.4 you can simply do:
explode('.', 'en.example.com')[0];
Solution 2 - Php
Uses the parse_url function.
$url = 'http://en.example.com';
$parsedUrl = parse_url($url);
$host = explode('.', $parsedUrl['host']);
$subdomain = $host[0];
echo $subdomain;
For multiple subdomains
$url = 'http://usa.en.example.com';
$parsedUrl = parse_url($url);
$host = explode('.', $parsedUrl['host']);
$subdomains = array_slice($host, 0, count($host) - 2 );
print_r($subdomains);
Solution 3 - Php
You can do this by first getting the domain name (e.g. sub.example.com => example.co.uk) and then use strstr to get the subdomains.
$testArray = array(
'sub1.sub2.example.co.uk',
'sub1.example.com',
'example.com',
'sub1.sub2.sub3.example.co.uk',
'sub1.sub2.sub3.example.com',
'sub1.sub2.example.com'
);
foreach($testArray as $k => $v)
{
echo $k." => ".extract_subdomains($v)."\n";
}
function extract_domain($domain)
{
if(preg_match("/(?P<domain>[a-z0-9][a-z0-9\-]{1,63}\.[a-z\.]{2,6})$/i", $domain, $matches))
{
return $matches['domain'];
} else {
return $domain;
}
}
function extract_subdomains($domain)
{
$subdomains = $domain;
$domain = extract_domain($subdomains);
$subdomains = rtrim(strstr($subdomains, $domain, true), '.');
return $subdomains;
}
Outputs:
0 => sub1.sub2
1 => sub1
2 =>
3 => sub1.sub2.sub3
4 => sub1.sub2.sub3
5 => sub1.sub2
Solution 4 - Php
<?php
$url = 'http://user:[email protected]/path?argument=value#anchor';
$array=parse_url($url);
$array['host']=explode('.', $array['host']);
echo $array['host'][0]; // returns 'sub'
?>
Solution 5 - Php
As the only reliable source for domain suffixes are the domain registrars, you can't find the subdomain without their knowledge. There is a list with all domain suffixes at https://publicsuffix.org. This site also links to a PHP library: https://github.com/jeremykendall/php-domain-parser.
Please find an example below. I also added the sample for en.test.co.uk which is a domain with a multi suffix (co.uk).
<?php
require_once 'vendor/autoload.php';
$pslManager = new Pdp\PublicSuffixListManager();
$parser = new Pdp\Parser($pslManager->getList());
$host = 'http://en.example.com';
$url = $parser->parseUrl($host);
echo $url->host->subdomain;
$host = 'http://en.test.co.uk';
$url = $parser->parseUrl($host);
echo $url->host->subdomain;
Solution 6 - Php
Simply...
preg_match('/(?:http[s]*\:\/\/)*(.*?)\.(?=[^\/]*\..{2,5})/i', $url, $match);
Just read $match[1]
Working example
It works perfectly with this list of urls
$url = array(
'http://www.domain.com', // www
'http://domain.com', // --nothing--
'https://domain.com', // --nothing--
'www.domain.com', // www
'domain.com', // --nothing--
'www.domain.com/some/path', // www
'http://sub.domain.com/domain.com', // sub
'опубликованному.значения.ua', // опубликованному ;)
'значения.ua', // --nothing--
'http://sub-domain.domain.net/domain.net', // sub-domain
'sub-domain.third-Level_DomaIN.domain.uk.co/domain.net' // sub-domain
);
foreach ($url as $u) {
preg_match('/(?:http[s]*\:\/\/)*(.*?)\.(?=[^\/]*\..{2,5})/i', $u, $match);
var_dump($match);
}
Solution 7 - Php
Simplest and fastest solution.
$sSubDomain = str_replace('.example.com','',$_SERVER['HTTP_HOST']);
Solution 8 - Php
PHP 7.0: Use the explode function and create a list of all the results.
list($subdomain,$host) = explode('.', $_SERVER["SERVER_NAME"]);
Example: sub.domain.com
echo $subdomain;
Result: sub
echo $host;
Result: domain
Solution 9 - Php
$REFERRER = $_SERVER['HTTP_REFERER']; // Or other method to get a URL for decomposition
$domain = substr($REFERRER, strpos($REFERRER, '://')+3);
$domain = substr($domain, 0, strpos($domain, '/'));
// This line will return 'en' of 'en.example.com'
$subdomain = substr($domain, 0, strpos($domain, '.'));
Solution 10 - Php
Using regex, string functions, parse_url() or their combinations it's not real solution. Just test any of proposed solutions with domain test.en.example.co.uk, there will no any correct result.
Correct solution is use package that parses domain with Public Suffix List. I recomend TLDExtract, here is sample code:
$extract = new LayerShifter\TLDExtract\Extract();
$result = $extract->parse('test.en.example.co.uk');
$result->getSubdomain(); // will return (string) 'test.en'
$result->getSubdomains(); // will return (array) ['test', 'en']
$result->getHostname(); // will return (string) 'example'
$result->getSuffix(); // will return (string) 'co.uk'
Solution 11 - Php
What I found the best and short solution is
array_shift(explode(".",$_SERVER['HTTP_HOST']));
Solution 12 - Php
For those who get 'Error: Strict Standards: Only variables should be passed by reference.' Use like this:
$env = (explode(".",$_SERVER['HTTP_HOST'])); $env = array_shift($env);
Solution 13 - Php
$domain = 'sub.dev.example.com';
$tmp = explode('.', $domain); // split into parts
$subdomain = current($tmp);
print($subdomain); // prints "sub"
As seen in a previous question: https://stackoverflow.com/questions/13832626/how-to-get-the-first-subdomain-with-php
Solution 14 - Php
There isn't really a 100% dynamic solution - I've just been trying to figure it out as well and due to different domain extensions (DTL) this task would be really difficult without actually parsing all these extensions and checking them each time:
The most reliable option is to define a constant (or database entry etc.) that stores the actual domain name and remove it from the $_SERVER['SERVER_NAME'] using substr()
defined("DOMAIN")
|| define("DOMAIN", 'mymaindomain.co.uk');
function getSubDomain() {
if (empty($_SERVER['SERVER_NAME'])) {
return null;
}
$subDomain = substr($_SERVER['SERVER_NAME'], 0, -(strlen(DOMAIN)));
if (empty($subDomain)) {
return null;
}
return rtrim($subDomain, '.');
}
Now if you're using this function under http://test.mymaindomain.co.uk it will give you test or if you have multiple sub-domain levels http://another.test.mymaindomain.co.uk you'll get another.test - unless of course you update the DOMAIN.
I hope this helps.
Solution 15 - Php
Simply
reset(explode(".", $_SERVER['HTTP_HOST']))
Solution 16 - Php
this is my solution, it works with the most common domains, you can fit the array of extensions as you need:
$SubDomain = explode('.', explode('|ext|', str_replace(array('.com', '.net', '.org'), '|ext|',$_SERVER['HTTP_HOST']))[0]);
Solution 17 - Php
I'm doing something like this
$url = https://en.example.com
$splitedBySlash = explode('/', $url);
$splitedByDot = explode('.', $splitedBySlash[2]);
$subdomain = $splitedByDot[0];
Solution 18 - Php
Suppose current url = sub.example.com
$host = array_reverse(explode('.', $_SERVER['SERVER_NAME']));
if (count($host) >= 3){
echo "Main domain is = ".$host[1].".".$host[0]." & subdomain is = ".$host[2];
// Main domain is = example.com & subdomain is = sub
} else {
echo "Main domain is = ".$host[1].".".$host[0]." & subdomain not found";
// "Main domain is = example.com & subdomain not found";
}
Solution 19 - Php
// For www.abc.en.example.com
$host_Array = explode(".",$_SERVER['HTTP_HOST']); // Get HOST as array www, abc, en, example, com
array_pop($host_Array); array_pop($host_Array); // Remove com and exmaple
array_shift($host_Array); // Remove www (Optional)
echo implode($host_Array, "."); // Combine array abc.en
Solution 20 - Php
I know I'm really late to the game, but here goes.
What I did was take the HTTP_HOST server variable ($_SERVER['HTTP_HOST']) and the number of letters in the domain (so for example.com it would be 11).
Then I used the substr function to get the subdomain. I did
$numberOfLettersInSubdomain = strlen($_SERVER['HTTP_HOST'])-12
$subdomain = substr($_SERVER['HTTP_HOST'], $numberOfLettersInSubdomain);
I cut the substring off at 12 instead of 11 because substrings start on 1 for the second parameter. So now if you entered test.example.com, the value of $subdomain would be test.
This is better than using explode because if the subdomain has a . in it, this will not cut it off.
Solution 21 - Php
if you are using drupal 7
this will help you:
global $base_path;
global $base_root;
$fulldomain = parse_url($base_root);
$splitdomain = explode(".", $fulldomain['host']);
$subdomain = $splitdomain[0];
Solution 22 - Php
$host = $_SERVER['HTTP_HOST'];
preg_match("/[^\.\/]+\.[^\.\/]+$/", $host, $matches);
$domain = $matches[0];
$url = explode($domain, $host);
$subdomain = str_replace('.', '', $url[0]);
echo 'subdomain: '.$subdomain.'<br />';
echo 'domain: '.$domain.'<br />';
Solution 23 - Php
From PHP 5.3 you can use strstr() with true parameter
echo strstr($_SERVER["HTTP_HOST"], '.', true); //prints en
Solution 24 - Php
function get_subdomain($url=""){
if($url==""){
$url = $_SERVER['HTTP_HOST'];
}
$parsedUrl = parse_url($url);
$host = explode('.', $parsedUrl['path']);
$subdomains = array_slice($host, 0, count($host) - 2 );
return implode(".", $subdomains);
}
Solution 25 - Php
Try this...
$domain = 'en.example.com';
$tmp = explode('.', $domain);
$subdomain = current($tmp);
echo($subdomain); // echo "en"
Solution 26 - Php
you can use this too
echo substr($_SERVER['HTTP_HOST'], 0, strrpos($_SERVER['HTTP_HOST'], '.', -5));
Solution 27 - Php
We use this function to handle multiple subdomain and multiple tld also handle ip and localhost
function analyse_host($_host)
{
$my_host = explode('.', $_host);
$my_result = ['subdomain' => null, 'root' => null, 'tld' => null];
// if host is ip, only set as root
if(filter_var($_host, FILTER_VALIDATE_IP))
{
// something like 127.0.0.5
$my_result['root'] = $_host;
}
elseif(count($my_host) === 1)
{
// something like localhost
$my_result['root'] = $_host;
}
elseif(count($my_host) === 2)
{
// like jibres.com
$my_result['root'] = $my_host[0];
$my_result['tld'] = $my_host[1];
}
elseif(count($my_host) >= 3)
{
// some conditons like
// ermile.ac.ir
// ermile.jibres.com
// ermile.jibres.ac.ir
// a.ermile.jibres.ac.ir
// get last one as tld
$my_result['tld'] = end($my_host);
array_pop($my_host);
// check last one after remove is probably tld or not
$known_tld = ['com', 'org', 'net', 'gov', 'co', 'ac', 'id', 'sch', 'biz'];
$probably_tld = end($my_host);
if(in_array($probably_tld, $known_tld))
{
$my_result['tld'] = $probably_tld. '.'. $my_result['tld'];
array_pop($my_host);
}
$my_result['root'] = end($my_host);
array_pop($my_host);
// all remain is subdomain
if(count($my_host) > 0)
{
$my_result['subdomain'] = implode('.', $my_host);
}
}
return $my_result;
}
Solution 28 - Php
Maybe I'm late, but even though the post is old, just as I get to it, many others do.
Today, the wheel is already invented, with a library called php-domain-parser that is active, and in which two mechanisms can be used. One based on the Public Suffix List and one based on the IANA list.
Simple and effective, it allows us to create simple helpers that help us in our project, with the ability to know that the data is maintained, in a world in which the extensions and their variants are very changeable.
Many of the answers given in this post do not pass a battery of unit tests, in which certain current extensions and their variants with multiple levels are checked, and neither with the casuistry of domains with extended characters.
Maybe it serves you, as it served me.
Solution 29 - Php
<?php
// Your code here!
function get_domain($host) {
$parts = explode('.',$host);
$extension = $parts[count($parts)-1];
$name = $parts[count($parts)-2];
return $name.'.'.$extension;
}
echo get_domain("https://api.neoistone.com");
?>
Solution 30 - Php
If you only want what comes before the first period:
list($sub) = explode('.', 'en.example.com', 2);