woocommerce_layered_nav_default_query_type │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_layered_nav_default_query_type', 'wp_kama_woocommerce_layered_nav_default_query_type_filter' );

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

	// filter...
	return $string;
}

$string

-

Where the hook is called

self::$chosen_attributes[ $taxonomy ]['query_type'] = $query_type ? $query_type : apply_filters( 'woocommerce_layered_nav_default_query_type', 'and' );

Where the hook is used in WooCommerce