How to use add_action to hook a static method from other Class
Your class, Test, is namespaced however you aren't using any namespace when calling add_action.
Update this:
add_action('register_new_user', array('Test','auto_signin'),20);To this:
add_action( 'register_new_user', array( 'MyTest\Test', 'auto_signin' ), 20 );
I read Wordpress Plugin API Reference, but I cannot find any action named register_new_user, so you must be using a custom hook.
However, the method will be executed if and only if it is hooked and this hook should a corresponding do_action hook.
See this code:
class PluginTest { function __construct(){ } public static function insertNew(){ echo 'Hi!'; die(); }}do_action('custom_admin_notices');add_action( 'custom_admin_notices', array('PluginTest', 'insertNew'), 20);global $wp_filter;var_dump($wp_filter['custom_admin_notices']);If the do_action line is commented, you can still see the hook in the global variable while the method won't be executed. So check whether the line containing do_action is executed.