php - Changing the Add To Cart button text in WooCommerce for items with variations -

i'm running woocommerce version 2.5.5. following lines of code don't seem change add cart button text on product page item variations:

add_filter('variable_add_to_cart_text', 'my_custom_cart_button_text');  function my_custom_cart_button_text() {          return __('buy now', 'woocommerce');  } 

would happen know i'm missing?

the correct filter single product page woocommerce_product_single_add_to_cart_text.

function my_custom_cart_button_text( $text, $product ) {     if( $product->is_type( 'variable' ) ){         $text = __('buy now', 'woocommerce');     }     return $text; } add_filter( 'woocommerce_product_single_add_to_cart_text', 'my_custom_cart_button_text', 10, 2 );