WooCommerce 2.4 – Price cache workaround - Disable cache

woocommerce_custom_product_price_cache_key2.php

// This code is no longer required as of WooCommerce 2.5
/**
 * Disables the product price cache. This function looks for the cache key
 * that is about to be retrieved by WooCommerce, and deletes the cached data
 * associated to it.
 *
 * IMPORTANT
 * This function can have an impact on WooCommerce's performance, and it
 * should not be used unless necessary.
 * 
 * @param array cache_key_args The arguments that form the cache key.
 * @param WC_Product product The product for which the key is being generated.
 * @param bool display Indicates if the prices are being retrieved for display
 * purposes.
 * @return array
 * @since WooCommerce 2.4
 * @author Aelia <support@aelia.co>
 * @link http://aelia.co/2015/08/11/wc-2-4-workaround-for-price-cache
 */
function disable_variation_prices_cache($cache_key_args, $product, $display) {
  // Delete the cached data, if it exists
  $cache_key = 'wc_var_prices' . md5(json_encode($cache_key_args));
  delete_transient($cache_key);
  
  return $cache_key_args;
}
add_filter('woocommerce_get_variation_prices_hash', 'disable_variation_prices_cache', 10, 3);