How to get the first subdomain with PHP?

Question

I have a static domain of dev.example.com with wildcard subdomains like so *.dev.example.com.

I need to detect the name of the current wild

Answer 1

I think using parse_url function is much better approach:

getUrlSubdomain($url){
    $urlSegments = parse_url($url);
    $urlHostSegments = explode('.', $urlSegments['host']);

    if(count($urlHostSegments) > 2) {
        return $urlHostSegments[0];
    }
    else{
        return null;
    }
}