使用一个参数在WordPress中重写URL

Question

I have a page named "city":

http://localhost/wordpress/city/

It gets details from MySQL by URL id like:

http://localhost/wordpress/city/?id=paris

I want to change it like:

http://localhost/wordpress/city/paris

The real link of the city page in WordPress is:

http://localhost/wordpress/index.php?p=5

I try add_rewrite_rule, but it doesn't work:

add_action( 'init', 'add_mypage_rule' );
function add_mypage_rule() {
    add_rewrite_tag("%id%", '(\d+)');
    add_rewrite_rule('^city/([^/]*)/?','index.php?p=5&id=$matches[1]','top');
}

What add RewriteRule should I use for .htaccess?