WordPress 纯代码去除分类连接中的Category

为了美化WordPress的URL链接，去除掉分类连接中的category目录，让链接更方便记忆和访问，网上的代码，这里也记录一下：

add_action('load-themes.php', 'wpdocs_no_category_base_refresh_rules');
add_action('created_category', 'wpdocs_no_category_base_refresh_rules');
add_action('edited_category', 'wpdocs_no_category_base_refresh_rules');
add_action('delete_category', 'wpdocs_no_category_base_refresh_rules');
function wpdocs_no_category_base_refresh_rules(){
    global $wp_rewrite;
    $wp_rewrite->flush_rules();
}
add_action('init', 'wpdocs_no_category_base_permastruct');
function wpdocs_no_category_base_permastruct(){
    global $wp_rewrite, $wp_version;
    $wp_rewrite->extra_permastructs['category']['struct'] = '%category%';
}
add_filter('category_rewrite_rules', 'wpdocs_no_category_base_rewrite_rules');
function wpdocs_no_category_base_rewrite_rules($category_rewrite){
    $category_rewrite = array();
    $categories = get_categories(array('hide_empty' => false));
    foreach ($categories as $category) {
        $category_nicename = $category->slug;
        if ($category->parent == $category->cat_ID) {
            $category->parent = 0;
        } elseif ($category->parent != 0) {
            $category_nicename = get_category_parents($category->parent, false, '/', true) . $category_nicename;
        }
        $category_rewrite['(' . $category_nicename . ')/(?:feed/)?(feed|rdf|rss|rss2|atom)/?$'] = 'index.php?category_name=$matches[1]&feed=$matches[2]';
        $category_rewrite['(' . $category_nicename . ')/page/?([0-9]{1,})/?$'] = 'index.php?category_name=$matches[1]&paged=$matches[2]';
        $category_rewrite['(' . $category_nicename . ')/?$'] = 'index.php?category_name=$matches[1]';
    }
    global $wp_rewrite;
    $old_category_base = get_option('category_base') ? get_option('category_base') : 'category';
    $old_category_base = trim($old_category_base, '/');
    $category_rewrite[$old_category_base . '/(.*)$'] = 'index.php?category_redirect=$matches[1]';

    return $category_rewrite;
}

add_filter('query_vars', 'wpdocs_no_category_base_query_vars');
function wpdocs_no_category_base_query_vars($public_query_vars){
    $public_query_vars[] = 'category_redirect';
    return $public_query_vars;
}

add_filter('request', 'wpdocs_no_category_base_request');
function wpdocs_no_category_base_request($query_vars){
    if (isset($query_vars['category_redirect'])) {
        $catlink = trailingslashit(get_option('home')) . user_trailingslashit($query_vars['category_redirect'], 'category');
        status_header(301);
        header("Location: $catlink");
        exit();
    }
    return $query_vars;
}

将以上代码放到主题的functions.php 文件即可。