product_cat_class filter-hook . WC 1.0

Usage

add_filter( 'product_cat_class', 'filter_function_name_2968', 10, 3 );
function filter_function_name_2968( $classes, $class, $category ){
	// filter...

	return $classes;
}

$classes

-

$class

-

$category

-

Where the hook is called

$classes   = apply_filters( 'product_cat_class', $classes, $class, $category );

Where in WP core the hook is used WooCommerce