Filter url to domain

By cwarn23 on Sep 10th, 2009 10:24 am

In these three functions, you can filter to a url to just the domain name. There are three main methods of doing so which are all shown in the example and the usage of each function is shown in the example.

<?php
//function one - get entire domain
function fulldomain($domainb) {
    $bits = explode('/', $domainb);
    if ($bits[0]=='http:' || $bits[0]=='https:')
        {
        return $bits[0].'//'.$bits[2].'/';
        } else {
        return 'http://'.$bits[0].'/';
        }
    unset($bits);
    }

//function two - use regex to get entire domain
function preg_fulldomain ($domainb) {
    return 

preg_replace('/^((http(s)?:\/\/)?([^\/]+)(\/)?)(.*)/','$1',$domain

b);
    }

//function three - get domain and remove subdomain.
function domain($domainb)
	{
	$bits = explode('/', $domainb);
	if ($bits[0]=='http:' || $bits[0]=='https:')
		{
		$domainb= $bits[2];
		} else {
		$domainb= $bits[0];
		}
	unset($bits);
	$bits = explode('.', $domainb);
	$idz=count($bits);
	$idz-=3;
	if (strlen($bits[($idz+2)])==2) {
	$url=$bits[$idz].'.'.$bits[($idz+1)].'.'.$bits[($idz+2)];
	} else if (strlen($bits[($idz+2)])==0) {
	$url=$bits[($idz)].'.'.$bits[($idz+1)];
	} else {
	$url=$bits[($idz+1)].'.'.$bits[($idz+2)];
	}
	return $url;
	}


//below is the usage of each function
$address='http://www.subdomain.example.com/blog/index.php?id=1';
echo fulldomain($address);
echo '<br>';
echo preg_fulldomain($address);
echo '<br>';
echo domain($address);
?>

2 Years Ago

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... ... php.net/parse_url

ShawnCplus

Code Monkey

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1,583 posts since Apr 2005

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2 Years Ago

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You have used the preg instead of ereg I think it's a good Patrice .

NicAx64

Posting Pro

536 posts since Mar 2009

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2 Years Ago

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Agree that using parse_url could help. Thanks for writing this

whatsgoingon

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1 post since Oct 2009

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1 Year Ago

$parseUrl = parse_url(trim($Address));
$bits=explode('.', $parseUrl['host' );
unset($bits[0]);
$domain = implode('.',$bits);

roninio

Newbie Poster

2 posts since Feb 2011

Reputation Points: 10

Solved Threads: 1

5 Months Ago

ronino: Thanks, I used your code... And modified it too! The following code will only remove the subdomain if it exists... If you run http://domain.com through ronino's code, it would come out as "com". This is a simple fix to check there are more than 2 "bits".

$parseUrl = parse_url(trim($filename));
	$bits=explode('.', $parseUrl['host']);
	if (count($bits) > 2) {
		unset($bits[0]);
	}
	$domain = implode('.',$bits);

Enjoy ;P http://kthxbai2u.com/

***Note: The above code only works on single . TLD's (.com, .net, .org) If you get "fasthost.co.uk", it will come out as "co.uk"***
I am working on a fix :)

[EDIT]

I ended up using another code from elsewhere which works flawlessly so far. Here it is:

function getDomain($domainb)
	{
	$bits = explode('/', $domainb);
	if ($bits[0]=='http:' || $bits[0]=='https:')
		{
		$domainb= $bits[2];
		} else {
		$domainb= $bits[0];
		}
	unset($bits);
	$bits = explode('.', $domainb);
	$idz=count($bits);
	$idz-=3;
	if (strlen($bits[($idz+2)])==2) {
	$url=$bits[$idz].'.'.$bits[($idz+1)].'.'.$bits[($idz+2)];
	} else if (strlen($bits[($idz+2)])==0) {
	$url=$bits[($idz)].'.'.$bits[($idz+1)];
	} else {
	$url=$bits[($idz+1)].'.'.$bits[($idz+2)];
	}
	return $url;
	}

kthxbai2u

Newbie Poster

1 post since Dec 2011

Reputation Points: 10

Solved Threads: 0

5 Months Ago

Thank you for code. I will try this code in my application, I hope it will good work

huongviet

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3 posts since Dec 2011

Reputation Points: 10

Solved Threads: 1

This article has been dead for over three months

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