How to add tag management functionality to a WordPress plugin

How to add tag management functionality to WordPress plugins

Introduction:
WordPress is one of the most popular content management systems in the world, with a large number of plugins to extend it its function. And tag management function is a very common requirement, in this article, we will learn how to add tag management function to WordPress plugin.

Introduction:
Adding tag management functions to WordPress plug-ins can greatly improve the flexibility and customizability of the plug-in. Users can add tags to plug-ins and categorize, filter and search plug-ins based on these tags. In this article, we will learn how to add a tag management system to a plugin and provide some code examples to aid understanding.

Step 1: Create a database table
First, we need to create a new table in the WordPress database to store the plugin’s tag data. We can do this using the global database object $wpdb provided by WordPress.

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' );

The above code will create a new table named plugin_tags when the plugin is activated.

Step 2: Add a tag management page
Next, we need to add a management page for the plug-in to manage tags. We can use WordPress’s add_menu_page function to create the admin page.

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
}

The above code will add a menu item named "Plugin Tags" to the WordPress backend management menu, and specify the callback function my_plugin_tags_callback to display the content of the tag management page.

Step 3: Add tag management function
In the tag management page, we can add tags to the plug-in and display the existing tag list. We can use WordPress's built-in wp_insert_term function to add tags, and use the get_terms function to get a list of existing tags.

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>';
        }
    }
}

The above code example demonstrates how to add tags in the tag management page and display the existing tag list.

Conclusion:
By adding the tag management function to the WordPress plug-in, we can better organize and manage the tag data of the plug-in. I hope the code examples provided in this article can help you easily implement tag management functions when developing plug-ins. Good luck with your plug-in development journey!

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