PHP Function to get Domain Name from URL

Use this php function to get domain name form a URL. A simple function which takes a valid url and returns you a domain name.

function getDomainName($sourceurl) {
    if(filter_var($sourceurl, FILTER_VALIDATE_URL, FILTER_FLAG_HOST_REQUIRED)===FALSE) {
        return false;
    }
    $url_parts = parse_url($sourceurl);
    return $url_parts['scheme'].'://'.$url_parts['host'];
}