我有一个自定义的帖子类型，叫做shop 其中包含产品帖子。此帖子类型连接到分类shop-category, 指定车间内的产品部分。

每个产品都有一个item_width 和item_height 自定义字段。正如您在下面看到的，我制作了一些URL，以按宽度和高度过滤产品：

https://www.example.com/shop-category/product/
https://www.example.com/shop-category/product/80/
https://www.example.com/shop-category/product/80/200/
https://www.example.com/shop-category/product/80/200/page/2/

当您使用分页导航到产品的下一页时，将设置最后url（/页/2/）的最后两个级别。目前，您只能在item_width 和item_height 已设置查询参数。现在我想知道，当item_width 和item_height 未设置。

例如，使用以下url：

https://www.example.com/shop-category/product/page/2/

Added variables and added rewrite rules:

// Adds query vars for shop post type
function gtp_add_shop_query_vars( $vars ) {
    $vars[] = \'shop-category\';
    $vars[] = \'item_width\';
    $vars[] = \'item_height\';
    return $vars;       
}
add_filter( \'query_vars\', \'gtp_add_shop_query_vars\' );

// Adds rewrite rules for shop post type
function gtp_add_shop_rewrite_rules() {
    add_rewrite_rule( \'^shop-category/([^/]*)/([^/]*)/([^/]*)/([^/]*)/([^/]*)$\', \'index.php?shop-category=$matches[1]&item_width=$matches[2]&item_height=$matches[3]&page=$matches[4]&paged=$matches[5]\', \'top\' );
    add_rewrite_rule( \'^shop-category/([^/]*)/([^/]*)/([^/]*)$\', \'index.php?shop-category=$matches[1]&item_width=$matches[2]&item_height=$matches[3]\', \'top\' );
    add_rewrite_rule( \'^shop-category/([^/]*)/([^/]*)$\', \'index.php?shop-category=$matches[1]&item_width=$matches[2]\', \'top\' );
    add_rewrite_rule( \'^shop-category/([^/]*)$\', \'index.php?shop-category=$matches[1]\', \'top\' );
}
add_action( \'init\', \'gtp_add_shop_rewrite_rules\', 10, 0 );

/** 
 * Adds rewrite rules for shop category
 */  
function gtp_add_shop_rewrite_rules() {

    // shop-category/category/item_width/item_height/page/2/
    add_rewrite_rule( \'^shop-category\\/([^/]*)\\/([^/]*)\\/([^/]*)\\/page\\/([0-9]*)$\', \'index.php?shop-category=$matches[1]&item_width=$matches[2]&item_height=$matches[3]&paged=$matches[4]\', \'top\' );

    // shop-category/category/page/2/
    add_rewrite_rule( \'^shop-category\\/([^/]*)\\/page\\/([0-9]*)$\', \'index.php?shop-category=$matches[1]&paged=$matches[2]\', \'top\' );

    // /shop-category/category/item_width/item_height/
    add_rewrite_rule( \'^shop-category\\/([^/]*)\\/([^/]*)\\/([^/]*)$\', \'index.php?shop-category=$matches[1]&item_width=$matches[2]&item_height=$matches[3]\', \'top\' );

    // /shop-category/category/item_width/
    add_rewrite_rule( \'^shop-category\\/([^/]*)\\/([^/]*)$\', \'index.php?shop-category=$matches[1]&item_width=$matches[2]\', \'top\' );

}
add_action( \'init\', \'gtp_add_shop_rewrite_rules\', 10, 0 );