How to add article category management function to WordPress plug-in

WordPress is one of the most widely used content management systems at present, and it provides a wealth of plug-ins to extend its functions. . If you are a plug-in developer, you may encounter the need to add article category management functions to your plug-in. This article will introduce you to how to add article category management functions to WordPress plugins, and provide code examples for reference.

1. Create a category
   First, we need to create a new article category for the plug-in. This can be accomplished using the register_taxonomy() function. The following is a sample code:

// 在插件的主活動(dòng)文件中添加以下代碼
function custom_plugin_taxonomy() {
    $labels = array(
        'name' => _x( '插件分類', 'taxonomy general name', 'textdomain' ),
        'singular_name' => _x( '插件分類', 'taxonomy singular name', 'textdomain' ),
        'search_items' =>  __( '搜索分類', 'textdomain' ),
        'all_items' => __( '所有分類', 'textdomain' ),
        'parent_item' => __( '父級(jí)分類', 'textdomain' ),
        'parent_item_colon' => __( '父級(jí)分類：', 'textdomain' ),
        'edit_item' => __( '編輯分類', 'textdomain' ),
        'update_item' => __( '更新分類', 'textdomain' ),
        'add_new_item' => __( '添加新分類', 'textdomain' ),
        'new_item_name' => __( '新分類名稱', 'textdomain' ),
        'menu_name' => __( '分類', 'textdomain' ),
    );

    $args = array(
        'hierarchical' => true,
        'labels' => $labels,
        'show_ui' => true,
        'show_admin_column' => true,
        'query_var' => true,
        'rewrite' => array( 'slug' => 'plugin_category' ),
    );

    register_taxonomy( 'plugin_category', array( 'post' ), $args );
}
add_action( 'init', 'custom_plugin_taxonomy', 0 );

In the above code, we use the register_taxonomy() function to create a new article category named plugin_category . This category has some basic properties such as name, search text, and editing operations.

2. Enable category management for the plug-in
   Now, we need to add an interface to the plug-in so that users can select and manage categories in the article editing page. We can use the hook function add_meta_box() to achieve this. The following is a sample code:

// 在插件的主活動(dòng)文件中添加以下代碼
function custom_plugin_taxonomy_meta_box() {
    add_meta_box(
        'plugin_category',
        __( '插件分類', 'textdomain' ),
        'custom_plugin_taxonomy_meta_box_callback',
        'post',
        'side',
        'default'
    );
}
add_action( 'add_meta_boxes', 'custom_plugin_taxonomy_meta_box' );

function custom_plugin_taxonomy_meta_box_callback( $post ) {
    wp_nonce_field( 'custom_plugin_taxonomy_meta_box', 'custom_plugin_taxonomy_meta_box_nonce' );

    $terms = get_terms( array(
        'taxonomy' => 'plugin_category',
        'hide_empty' => false,
    ) );

    if ( ! empty( $terms ) && ! is_wp_error( $terms ) ) {
        echo '<select name="plugin_category">';
        foreach ( $terms as $term ) {
            echo '<option value="' . $term->term_id . '">' . $term->name . '</option>';
        }
        echo '</select>';
    }
}

In the above code, we use the add_meta_box() function to add a new meta box for displaying the category selection box. In the custom_plugin_taxonomy_meta_box_callback() function, we use the get_terms() function to get all available categories and output a drop-down menu for the user to choose.

3. Saving and updating categories
   Finally, we need to add code to save and update the selected category. We can use the hook function save_post to handle this task. The following is a sample code:

// 在插件的主活動(dòng)文件中添加以下代碼
function custom_plugin_taxonomy_save_meta_box_data( $post_id ) {
    if ( ! isset( $_POST['plugin_category'] ) ) {
        return;
    }

    if ( ! wp_verify_nonce( $_POST['custom_plugin_taxonomy_meta_box_nonce'], 'custom_plugin_taxonomy_meta_box' ) ) {
        return;
    }

    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
        return;
    }

    if ( ! current_user_can( 'edit_post', $post_id ) ) {
        return;
    }

    $term_id = intval( $_POST['plugin_category'] );
    wp_set_post_terms( $post_id, array( $term_id ), 'plugin_category' );
}
add_action( 'save_post', 'custom_plugin_taxonomy_save_meta_box_data' );

In the above code, we check whether the category selection box is selected and verify the submitted form data using the wp_verify_nonce() function. Then, we use the wp_set_post_terms() function to save the selected category to the current article.

Through the above steps, you have successfully added the article category management function to your WordPress plug-in. Users can now select and manage categories in the article editing page for a better content management experience.

Summary
This article introduces how to add article category management functions to the WordPress plug-in and provides relevant code examples. You can add this by using the register_taxonomy() function to create a taxonomy, the add_meta_box() function to add interfaces, and the save_post hook function to save and update the taxonomy. Features are quickly integrated into their own plug-ins. I hope this article is helpful to you, and I wish you can write more powerful WordPress plug-ins!

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