woocommerce_product_categories │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_product_categories', 'wp_kama_woocommerce_product_categories_filter' );

/**
 * Function for `woocommerce_product_categories` filter-hook.
 * 
 * @param  $terms 
 *
 * @return 
 */
function wp_kama_woocommerce_product_categories_filter( $terms ){

	// filter...
	return $terms;
}

$terms

-

Where the hook is called

$product_categories = apply_filters(
	'woocommerce_product_categories',
	get_terms( 'product_cat', $args )
);

Where the hook is used in WooCommerce