WC_Product_Variable::add_to_cart_text PHP Method

    public function add_to_cart_text()
    {
        return apply_filters('woocommerce_product_add_to_cart_text', $this->is_purchasable() ? __('Select options', 'woocommerce') : __('Read more', 'woocommerce'), $this);
    }

 /**
  * Get the add to cart button text for the single page
  *
  * @access public
  * @return string
  */
 public function single_add_to_cart_text()
 {
     if ($this->is_purchasable() && $this->is_in_stock()) {
         $text = get_option(WC_Subscriptions_Admin::$option_prefix . '_add_to_cart_button_text', __('Sign Up Now', 'woocommerce-subscriptions'));
     } else {
         $text = parent::add_to_cart_text();
         // translated "Read More"
     }
     return apply_filters('woocommerce_product_single_add_to_cart_text', $text, $this);
 }