The following WordPress tutorial column will introduce to you how WordPress filters background articles. I hope it will be helpful to friends in need!

In addition to its own article classification, wordpress also supports custom classifications, that is, you can register custom article classifications according to your own needs.

How to register your own custom taxonomy?

First open the WordPress core function file functions.php and insert the following code in the appropriate location

function my_custom_post_courses() {
  $labels = array(
    'name'               => _x( 'courses', 'post type 名稱' ),
    'singular_name'      => _x( 'my_courses', 'post type 單個 item 時的名稱'),
    'add_new'            => _x( '增加課程', '添加新內容的鏈接名稱' ),
    'add_new_item'       => __( '增加一個課程' ),
    'edit_item'          => __( '編輯課程' ),
    'new_item'           => __( '新課程' ),
    'all_items'          => __( '所有課程' ),
    'view_item'          => __( '查看課程' ),
    'search_items'       => __( '搜索課程' ),
    'not_found'          => __( '沒有找到有關課程' ),
    'not_found_in_trash' => __( '回收站里面沒有相關課程' ),
    'parent_item_colon'  => '',
    'menu_name'          => '課程'
  );
  $args = array(
    'labels'        => $labels,
    'description'   => '我們網站的課程信息',
    'public'        => true,
    'menu_position' => 5,
    'supports'      => array( 'title', 'editor', 'thumbnail', 'excerpt', 'comments' ),
    'has_archive'   => true
  );
    register_post_type( 'my_courses', $args );
  }
  add_action( 'init', 'my_custom_post_courses' );

In this way, we have registered a custom taxonomy named 'Course'. The next step is how to set up filtered articles.

If you have a lot of articles or products, it is necessary for us to add a filtering function to the WordPress backend article list page, as shown below:

To achieve filtering Function requires two steps

The first step is to add the background function in the functions.php file and let the list page display this category selection

add_action('restrict_manage_posts', 'mycat_add_select_int');
function mycat_add_select_int(){
       global $typenow;
       global $wp_query;
       if ($typenow == 'course') {
              return wp_dropdown_categories(array(
                     'show_option_all' => '課程分類',
                     'taxonomy' => 'course_list',
                     'name' => 'course_list',
                     'orderby' => 'name',
                     'selected' => @$wp_query->query['course_list'],
                     'hierarchical' => true,
                     'depth' => 5,
                     'show_count' => true,
                     'hide_empty' => false,
              ));
       }
}

The second step is to implement filtering Function

add_filter('parse_query', 'mycats_add_query_init');
function mycats_add_query_init($query){
       $qv = &$query->query_vars;
       if (($qv['course_list']) && is_numeric($qv['course_list'])) {
              $term = get_term_by('id', $qv['course_list'],'course_list');
              $qv['course_list'] = $term->slug;
       }
}

Only the above two steps are needed to easily implement the background article filtering function, which is very practical for blog webmasters or webmasters with many background articles on their websites.

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