注册新的公共帖子类型或分类时，始终刷新重写规则。否则，当URL映射到查询时，内部重写规则将不考虑这一点。

你可以通过连接到registered_post_type 和registered_taxonomy.

下面是根据评论和其他人的反馈更新的代码。

下载为插件T5 Silent Flush 在GitHub上。

add_action( \'registered_post_type\', \'t5_silent_flush_cpt\', 10, 2 );
add_action( \'registered_taxonomy\',  \'t5_silent_flush_tax\', 10, 3 );

/**
 * Flush rules for custom post types.
 *
 * @wp-hook registered_post_type
 * @param   string $post_type
 * @param   stdClass $args
 * @return  void
 */
function t5_silent_flush_cpt( $post_type, $args )
{
    if ( $args->_builtin )
        return;

    if ( ! $args->public )
        return;

    if ( ! $args->publicly_queryable )
        return;

    if ( ! $args->rewrite )
        return;

    $slug = $post_type;

    if ( isset ( $args->rewrite[\'slug\'] ) && is_string( $args->rewrite[\'slug\'] ) )
        $slug = $args->rewrite[\'slug\'];

    $rules = get_option( \'rewrite_rules\' );

    if ( ! isset ( $rules[ $slug . \'/?$\'] ) )
        flush_rewrite_rules( FALSE );
}

/**
 * Flush rules for custom post taxonomies.
 *
 * @wp-hook registered_taxonomy
 * @param   string $taxonomy
 * @param   string $object_type
 * @param   array  $args
 * @return  void
 */
function t5_silent_flush_tax( $taxonomy, $object_type, $args )
{
    // No idea why we get an array here, but an object for post types.
    // Objects are easier to write, so ...
    $args = (object) $args;

    if ( $args->_builtin )
        return;

    if ( ! $args->public )
        return;

    if ( ! $args->rewrite )
        return;

    $slug = $taxonomy;

    if ( isset ( $args->rewrite[\'slug\'] ) && is_string( $args->rewrite[\'slug\'] ) )
        $slug = $args->rewrite[\'slug\'];


    $rules = get_option( \'rewrite_rules\' );

    if ( ! isset ( $rules[ $slug . \'/(.+?)/?$\'] ) )
        flush_rewrite_rules( FALSE );
}