woocommerce_product_price_class │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_product_price_class', 'wp_kama_woocommerce_product_price_class_filter' );

/**
 * Function for `woocommerce_product_price_class` filter-hook.
 * 
 * @param  $string 
 *
 * @return 
 */
function wp_kama_woocommerce_product_price_class_filter( $string ){

	// filter...
	return $string;
}

$string

-

Where the hook is called

<p class="<?php echo esc_attr( apply_filters( 'woocommerce_product_price_class', 'price' ) ); ?>"><?php echo $product->get_price_html(); ?></p>

Where the hook is used in WooCommerce