Laravel子域解析

I want to get subdomains from url in laravel. Using this at now

App::before(function($request)
{
        if(Request::path() == '/' && !Request::ajax()){
        $urlParts = explode('.', $_SERVER['HTTP_HOST']);
        if($urlParts[0] == 'fasfin' || $urlParts[1] == 'fasfin' && $urlParts[0] == 'www') {Route::get('/', 'HomeController@index');} //check if url is main site
        elseif($urlParts[0] == 'www') { $subdomain = $urlParts[1]; return App::make('SubdomainController')->getIndex($subdomain);} //fix for www.subdomain.mydomain.com
        else {$subdomain = $urlParts[0]; return App::make('SubdomainController')->getIndex($subdomain);}
        } //get subdomain
});

But this is kind of very bad code, i know. Trick from official docs with {subdomain}.mydomain.com doesn't works. I enabled all subdomains from apache with

Server Alias *.mydomain.com

Update

Changed my code to this

if(!Request::ajax()){
        $isSubdomain = false;
        $urlParts = explode('.', $_SERVER['HTTP_HOST']);
        if($urlParts[0] == 'fasfin' || $urlParts[1] == 'fasfin' && $urlParts[0] == 'www') {Route::get('/', 'HomeController@index');}
        elseif($urlParts[0] == 'www') { $subdomain = $urlParts[1]; $isSubdomain = true;}
        else {$subdomain = $urlParts[0]; $isSubdomain = true;}
        if($isSubdomain)
        {
            $user = App::make('SubdomainController')->checkIndex($subdomain);
            if($user instanceof Exception) return View::make('subdomain.notExist');
            $shop = App::make('SubdomainController')->getIndex($subdomain);
            if($shop instanceof Exception) return 'Shop was already registered, but doesn't created yet';
        }
    }