Remove action within a class in a parent theme's includes folder from the child theme

Question

There's a class in parent's theme includes folder which adds action i want to remove in the child theme functions.php or in the plugin

class A {
   public function __construct() {
      ...
      add_action( 'woocommerce_before_customer_login_form', array( $this, 'before_customer_login_form' ) );
      ...
   }


    public function before_customer_login_form() {
        echo ( 'yes' !== get_option( 'woocommerce_enable_myaccount_registration' ) ) ? '<div id="customer_login" class="woocommerce-content-box full-width">' : '';
    }
}

functions.php code inspired by solution from here

function remove_woo_forms_hooks() {
    remove_action('woocommerce_before_customer_login_form', array('A','before_customer_login_form'));
}

add_action( 'after_setup_theme', 'remove_woo_forms_hooks',0);

Though action removal doesn't work. before_customer_login_form action is still fired.

Suspect that the code

remove_action('woocommerce_before_customer_login_form',array('A','before_customer_login_form'));

is not correct.

How to remove the action correctly?

Answer 1

Thanks a lot to Nathan Johnson:

The solution was to use instance of the class the action was defined in. The class was globalized in the theme after instantiation. So the adding the below code to functions.php of a Child Theme worked:

function remove_woo_forms_hooks() {
    global $woo_a;
    remove_action('woocommerce_before_customer_login_form', array($woo_a,'before_customer_login_form'));
}

add_action( 'after_setup_theme', 'remove_woo_forms_hooks',0);