Is it possible to add an action to the currently running action?

My question is very simple but I haven’t found this answer yet. Here’s an example:

class MyClass {
  public function __construct(){
    add_action('init', array($this, 'init'));
    add_action('wp_footer', array($this, 'footer'));
  }

  public function init(){
    add_action('init', array($this, 'register_scripts'));
  }

  public function register_scripts(){
    wp_register_script('my-script', plugins_url('/script.js', __FILE__));
  }

  public function footer(){
    echo('<div class="style-me">Rawr this is my plugin.</div>');
  }
}

This is how my code looks and it’s failing. It displays the div but the javascript does not get applied. So I wondered if my problem was running the init() function in the init action and then adding register_scripts() to the init action but I’m already in that action. Is this possible?

You have to use a later (higher) priority. So use current_filter() to get the current hook and priority, add 1 to that priority, and register the next action:

add_action( 'init', 'func_1' );

function func_1()
{
    global $wp_filter;

    $hook = current_filter();
    add_action( $hook, 'func_2', key( $wp_filter[ $hook ] ) + 1 );
}

function func_2()
{
    echo 'hi!';
}