What best practices should be followed when entering the App Domain for a Facebook App in PHP?

When entering the App Domain for a Facebook App in PHP, it is important to ensure that the domain matches the one where your app is hosted. This helps Facebook verify the origin of requests made to your app and ensures the security of your app.

// Set the App Domain for a Facebook App
$facebook = new Facebook(array(
  'appId'  => 'your_app_id',
  'secret' => 'your_app_secret',
  'appDomain' => 'your_domain.com'
));