require_once( wp_normalize_path(ABSPATH).'wp-load.php');
class Your_Plugin_Class {
private $is_user_logged_in;
add_action('init', function(){
$this-> is_user_logged_in = is_user_logged_in();
echo 'is_user_logged_in'.$this->is_user_logged_in;
});
add_filter('woocommerce_billing_fields-2',array( $this, 'add_billing_field' ));
}
public function add_billing_field( $fields = array() ) {
if ( $this->is_user_logged_in ){
echo 'add_billing_field'.$this->is_user_logged_in;
return $fields;
}else{
echo 'add_billing_field'.$this->is_user_logged_in;
}
}
}