How to find out the id of the node that is the main page?

Question

Drupal

Hello. Tell me how to programmatically find out the id of the node, which is the main one on the site. And it is written in the site configuration field, in the settings of a specific domain, with the Domain Access module installed

Answer 1

In general, the address of the main page is stored in a variable - variable_get('site_frontpage', ''). Using the address to find out the id of the node is not difficult.
I don't know how Domain Access works, but it probably either overwrites this variable somehow or has its own. If you have the Devel module installed, view the list of variables in /devel/variable.

Answer 2

https://api.drupal.org/api/drupal/includes%21path....
drupal_get_normal_path('/') => 'node/ID'