Priority Example

functions.php

<?php

/**
 * Changes the redirect URL for the Return To Shop button in the cart.
 * BECAUSE THIS FUNCTION HAS THE PRIORITY OF 20, IT WILL RUN AFTER THE FUNCTION BELOW (HIGHER NUMBERS RUN LATER)
 */

function wc_empty_cart_redirect_url() {
  return 'http://example.com/category/specials/';
}
add_filter( 'woocommerce_return_to_shop_redirect', 'wc_empty_cart_redirect_url', 20 );

/**
 * Changes the redirect URL for the Return To Shop button in the cart.
 * EVEN THOUGH THIS FUNCTION WOULD NORMALLY RUN LATER BECAUSE IT'S CODED AFTERWARDS, THE 10 PRIORITY IS LOWER THAN 20 ABOVE
 */

function wc_empty_cart_redirect_url() {
  return 'http://example.com/shop/';
}
add_filter( 'woocommerce_return_to_shop_redirect', 'wc_empty_cart_redirect_url', 10 );


?>