I created a function to check whether a URL is a subdomain URL or not.
<?php
header("Content-Type: text/plain");
function checkSubDomain($url)
{
$url = parse_url($url)["host"];
if(strstr($url,'.',true)=='www')
{
return 0;
break;
}
$domainExtensions = array(
'.com',
'.net',
'.org',
'.co.uk'
);
foreach($domainExtensions as $extension)
{
if($extension == substr($url,-(strlen($extension))))
{
$url = substr($url,0,-(strlen($extension)));
}
}
if (substr_count($url,'.') > 0)
{
return 1;
}
}
//Sub-domain exists
if(checkSubDomain('http://SUBDOMAIN.example.com/page'))
{
echo 'This URL contains a subdomain!';
echo "\r\n";
}
else
{
echo 'This URL does not have any subdomains!';
echo "\r\n";
}
//No subdomain (www)
if(checkSubDomain('http://www.example.com/page'))
{
echo 'This URL contains a subdomain!';
echo "\r\n";
}
else
{
echo 'This URL does not have any subdomains!';
echo "\r\n";
}
//Non-www URL (and no subdomain)
if(checkSubDomain('http://example.com/page'))
{
echo 'This URL contains a subdomain!';
echo "\r\n";
}
else
{
echo 'This URL does not have any subdomains!';
echo "\r\n";
}
Seems to be working perfectly (with the domain extensions needing updating), which leads me to ask...
Is there a PHP command that can automatically store an array with all domain extensions or do I need to update it manually?
AFTER removing all possible extensions from a given URL AND the domain doesn't start with www... Is it possible that it won't be a subdomain?