Usage
add_action( 'added_existing_user', 'your_callback_function', 10, 2 );Action Callback:
function your_callback_function( $details['user_id'], $result ) {
// Your code here
}Parameters
$details['user_id']Parameter 1
$resultParameter 2
⚡ Action Hook
Action hooks allow you to insert custom code at specific points during WordPress execution. Actions do not return any values.