下面是一些可以实现此目的的代码：

//Creates special permastruct that turns all terms of cities into slugs
add_action( \'init\', \'set_rewrite\' );

function set_rewrite() {
    //Get terms
    $terms = get_terms( \'cities\', array( \'hide_empty\' => false ) );
    //return if no terms
    if( count( $terms ) < 1 ) return;
    $slugs = wp_list_pluck( $terms, \'slug\' );
    //create term regex
    $termregex = \'(\' . implode( \'|\', $slugs) . \')\';
    //New query var
    add_rewrite_tag( \'%cityname%\', $termregex );
    //Add permastruct
    add_permastruct( \'cities_struct\', \'%cityname%/\' );
    //refresh if new term added
    if( get_option( \'update_cities_struct\' ) ) {
        global $wp_rewrite;
        $wp_rewrite -> flush_rules();
        update_option( \'update_cities_struct\', 0 );
    }
}

//action to refresh rewrite rules when a new term is saved
add_action( \'created_cities\', \'refresh_cities\' );
add_action( \'edited_cities\', \'refresh_cities\' );
add_action( \'delete_cities\', \'refresh_cities\' );


function refresh_cities() {
    update_option( \'update_cities_struct\', 1 );
}

//set city name to the taxonomy cities
add_filter( \'parse_query\', \'parse_cities_query\' );

function parse_cities_query( $query ) {
    if( !empty( $query->query_vars[\'cityname\'] ) ) $query->set( \'cities\', $query->query_vars[\'cityname\'] )
}   

基本上，这创建了一个特殊的permastruct，它使用分类法的slugcities 作为其基础。它创建一个名为cityname, 它只接受分类法的slug，然后将结果发送到适当的分类法查询变量。