Usage
add_action( 'add_user_to_blog', 'your_callback_function', 10, 3 );Action Callback:
function your_callback_function( $user_id, $role, $blog_id ) {
// Your code here
}Parameters
$user_idParameter 1
$roleParameter 2
$blog_idParameter 3
⚡ Action Hook
Action hooks allow you to insert custom code at specific points during WordPress execution. Actions do not return any values.