Parsing domain from a URL

Question

I need to build a function which parses the domain from a URL.

So, with

http://google.com/dhasjkdas/sadsdds/sdda/sdads.html

or

Answer 1

This will generally work very well if the input URL is not total junk. It removes the subdomain.

$host = parse_url( $Row->url, PHP_URL_HOST );
$parts = explode( '.', $host );
$parts = array_reverse( $parts );
$domain = $parts[1].'.'.$parts[0];

Example

Input: http://www2.website.com:8080/some/file/structure?some=parameters

Output: website.com

Answer 2

$domain = str_ireplace('www.', '', parse_url($url, PHP_URL_HOST));

This would return the google.com for both http://google.com/... and http://www.google.com/...

Answer 3

The code that was meant to work 100% didn't seem to cut it for me, I did patch the example a little but found code that wasn't helping and problems with it. so I changed it out to a couple of functions (to save asking for the list from Mozilla all the time, and removing the cache system). This has been tested against a set of 1000 URLs and seemed to work.

function domain($url)
{
    global $subtlds;
    $slds = "";
    $url = strtolower($url);

    $host = parse_url('http://'.$url,PHP_URL_HOST);

    preg_match("/[^\.\/]+\.[^\.\/]+$/", $host, $matches);
    foreach($subtlds as $sub){
        if (preg_match('/\.'.preg_quote($sub).'$/', $host, $xyz)){
            preg_match("/[^\.\/]+\.[^\.\/]+\.[^\.\/]+$/", $host, $matches);
        }
    }

    return @$matches[0];
}

function get_tlds() {
    $address = 'http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1';
    $content = file($address);
    foreach ($content as $num => $line) {
        $line = trim($line);
        if($line == '') continue;
        if(@substr($line[0], 0, 2) == '/') continue;
        $line = @preg_replace("/[^a-zA-Z0-9\.]/", '', $line);
        if($line == '') continue;  //$line = '.'.$line;
        if(@$line[0] == '.') $line = substr($line, 1);
        if(!strstr($line, '.')) continue;
        $subtlds[] = $line;
        //echo "{$num}: '{$line}'"; echo "<br>";
    }

    $subtlds = array_merge(array(
            'co.uk', 'me.uk', 'net.uk', 'org.uk', 'sch.uk', 'ac.uk', 
            'gov.uk', 'nhs.uk', 'police.uk', 'mod.uk', 'asn.au', 'com.au',
            'net.au', 'id.au', 'org.au', 'edu.au', 'gov.au', 'csiro.au'
        ), $subtlds);

    $subtlds = array_unique($subtlds);

    return $subtlds;    
}

Then use it like

$subtlds = get_tlds();
echo domain('www.example.com') //outputs: example.com
echo domain('www.example.uk.com') //outputs: example.uk.com
echo domain('www.example.fr') //outputs: example.fr

I know I should have turned this into a class, but didn't have time.

Answer 4

I've found that @philfreo's solution (referenced from php.net) is pretty well to get fine result but in some cases it shows php's "notice" and "Strict Standards" message. Here a fixed version of this code.

function getHost($url) { 
   $parseUrl = parse_url(trim($url)); 
   if(isset($parseUrl['host']))
   {
       $host = $parseUrl['host'];
   }
   else
   {
        $path = explode('/', $parseUrl['path']);
        $host = $path[0];
   }
   return trim($host); 
} 

echo getHost("http://example.com/anything.html");           // example.com
echo getHost("http://www.example.net/directory/post.php");  // www.example.net
echo getHost("https://example.co.uk");                      // example.co.uk
echo getHost("www.example.net");                            // example.net
echo getHost("subdomain.example.net/anything");             // subdomain.example.net
echo getHost("example.net");                                // example.net

Answer 5

function get_domain($url = SITE_URL)
{
    preg_match("/[a-z0-9\-]{1,63}\.[a-z\.]{2,6}$/", parse_url($url, PHP_URL_HOST), $_domain_tld);
    return $_domain_tld[0];
}

get_domain('http://www.cdl.gr'); //cdl.gr
get_domain('http://cdl.gr'); //cdl.gr
get_domain('http://www2.cdl.gr'); //cdl.gr

Answer 6

parse_url didn't work for me. It only returned the path. Switching to basics using php5.3+:

$url  = str_replace('http://', '', strtolower( $s->website));
if (strpos($url, '/'))  $url = strstr($url, '/', true);