Hi kokokurak,

If you want detect by domain name you can do it like this:

$env = $app->detectEnvironment(function()
{

    $env = '';
    
    switch($_SERVER['HTTP_HOST']){
        case 'test.localhost.dev':
            $env = 'dev';
            break;
    }
  
    return $env ?: 'production';

});

But it's not the goo way to detect the environment because:

. The environment is not detected properly in CLI . Domain spoofing

To configure properly one application I use this way:

$env = $app->detectEnvironment(function()
{
    $env = getenv('LARAVEL_ENV');

    if(empty($env)){
        if(file_exists(__DIR__.'/../.env')){
            $env = trim(file_get_contents(__DIR__.'/../.env'),"\n");
        }
    }

    return $env ?: 'local';

});

I use getenv to get the environment name put in the vhost configuration LARAVEL_ENV.

SetEnv LARAVEL_ENV staging 

If you can put environment variable on your vhost you can put a .env file at the root of your application en put the environment name.