WordPress 플러그인에 태그 관리 기능을 추가하는 방법

function my_plugin_create_table() {
    global $wpdb;

    $table_name = $wpdb->prefix . 'plugin_tags';

    $charset_collate = $wpdb->get_charset_collate();

    $sql = "CREATE TABLE $table_name (
        id mediumint(9) NOT NULL AUTO_INCREMENT,
        name varchar(100) NOT NULL,
        PRIMARY KEY  (id)
    ) $charset_collate;";

    require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
    dbDelta( $sql );
}
register_activation_hook( __FILE__, 'my_plugin_create_table' );

function my_plugin_add_tags_page() {
    add_menu_page( 'Plugin Tags', 'Plugin Tags', 'manage_options', 'my_plugin_tags', 'my_plugin_tags_callback', 'dashicons-tag', 25 );
}
add_action( 'admin_menu', 'my_plugin_add_tags_page' );

function my_plugin_tags_callback() {
    // 在这里显示标签管理页面的内容
}

function my_plugin_tags_callback() {
    if ( isset( $_POST['submit'] ) ) {
        $tag_name = sanitize_text_field( $_POST['tag_name'] );

        $term = wp_insert_term( $tag_name, 'plugin_tags' );

        if ( is_wp_error( $term ) ) {
            echo '<div class="error">添加标签失败，请重试。</div>';
        } else {
            echo '<div class="updated">标签已成功添加。</div>';
        }
    }
    
    $tags = get_terms( 'plugin_tags' );

    echo '<h2>标签管理</h2>';
    
    echo '<form method="post" action="">';
    echo '<input type="text" name="tag_name" placeholder="输入标签名称" required />';
    echo '<input type="submit" name="submit" value="添加标签" />';
    echo '</form>';

    if ( ! empty( $tags ) ) {
        echo '<h3>已有标签</h3>';

        foreach ( $tags as $tag ) {
            echo '<p>' . $tag->name . '</p>';
        }
    }
}