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copied!<p>You could use <a href="http://php.net/parse_url" rel="nofollow noreferrer"><code>parse_url</code></a> for parsing the URL and get the root domain, like so:</p> <ul> <li>Add <code>http://</code> to the URL if not already exists</li> <li>Get the hostname part of the URL using <code>PHP_URL_HOST</code> constant</li> <li><a href="http://php.net/explode" rel="nofollow noreferrer"><code>explode</code></a> the URL by a dot (<code>.</code>)</li> <li>Get the last two chunks of the array using <a href="http://php.net/array_slice" rel="nofollow noreferrer"><code>array_slice</code></a></li> <li>Implode the result array to get the root domain</li> </ul> <p>A little function I made (which is a modified version of my own answer <a href="https://stackoverflow.com/a/18678205/1438393">here</a>):</p> <pre><code>function getRootDomain($url) { if (!preg_match("~^(?:f|ht)tps?://~i", $url)) { $url = "http://" . $url; } $domain = implode('.', array_slice(explode('.', parse_url($url, PHP_URL_HOST)), -2)); return $domain; } </code></pre> <p>Test cases:</p> <pre><code>$a = 'http://example.com'; $urls = array( 'example.com/test', 'example.com/test.html', 'www.example.com/example.html', 'example.net/foobar', 'example.org/bar' ); foreach ($urls as $url) { if(getRootDomain($url) == getRootDomain($a)) { echo "Root domain is the same\n"; } else { echo "Not same\n"; } } </code></pre> <p>Output:</p> <pre><code>Root domain is the same Root domain is the same Root domain is the same Not same Not same </code></pre> <p>Note: This solution isn't foolproof and could fail for URLs like <code>example.co.uk</code> and you might want to additional checks to make sure that doesn't happen.</p> <p><a href="https://eval.in/51335" rel="nofollow noreferrer"><strong>Demo!</strong></a></p>

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