Custom routes in WP theme

functions.php

<?php
//file /wp-content/themes/current-theme/functions.php

function custom_addRoutes() {
	add_rewrite_rule('^([A-Za-z]+)/([A-Za-z\+]+)/([0-9]+)/?$', 'tour/?id=$matches[3]&city=$matches[2]&country=$matches[1]', 'top');
	add_rewrite_rule('^([A-Za-z]+)/([A-Za-z\+]+)/?$', 'city/?city_name_en=$matches[2]&country=$matches[1]', 'top');
	add_rewrite_rule('^([A-Za-z^index]+)/?$', 'country/?country_name_en=$matches[1]', 'top');
}
add_action('init', 'custom_addRoutes');