Migrating a WordPress website is not just about moving files—it’s also about transferring database-based custom functionalities without breaking the site. Many WordPress custom functionalities, such as custom post types (CPTs), user roles, plugin settings, and shortcodes, rely on the database. If not migrated properly, you may lose critical site features.

This guide will cover:
✅ What happens to custom functionalities during database migration?
✅ Types of WordPress database custom functionality migration
✅ Step-by-step migration process
✅ Best practices for a smooth transition

By following this WordPress database custom functionality migration development guide, you can seamlessly move your website while preserving all custom functionalities.

What Happens to Custom Functionalities During Database Migration?

✔ What Remains Intact?

Posts, pages, media files
User data (if correctly exported and imported)
Plugin settings stored in the wp_options table

✖ What Can Break or Get Lost?

Custom post types (CPTs) if tied to a theme
Custom taxonomies and meta fields
Shortcodes and widgets relying on plugin configurations
User roles and permissions if improperly migrated

A structured migration approach ensures that all WordPress database-based custom functionalities are successfully transferred.

Types of WordPress Database Custom Functionality Migration

1. Custom Post Types (CPTs) Migration

✔ CPTs are stored in the wp_posts table with a custom post_type value.
✔ If not registered in the new theme or plugin, they may not appear.

📌 Solution: Manually register CPTs in a plugin.

function custom_post_type_init() {
    register_post_type('custom_post', array(
        'labels' => array('name' => __('Custom Posts')),
        'public' => true,
        'has_archive' => true,
    ));
}
add_action('init', 'custom_post_type_init');

2. Custom Taxonomies Migration

✔ Taxonomies are stored in wp_terms, wp_term_taxonomy, and wp_term_relationships.
✔ If not registered post-migration, they may disappear.

📌 Solution: Register them in a plugin.

function custom_taxonomy() {
    register_taxonomy('custom_category', 'custom_post', array(
        'label' => __('Custom Categories'),
        'rewrite' => array('slug' => 'custom-category'),
        'hierarchical' => true,
    ));
}
add_action('init', 'custom_taxonomy');

3. Plugin Settings Migration

✔ Many plugins store settings in the wp_options table.
✔ If skipped, you may lose plugin configurations.

📌 Solution: Export plugin settings via WP-CLI or PHPMyAdmin.

wp db export plugin_settings.sql --tables=wp_options

Then import on the new site:

wp db import plugin_settings.sql

4. Custom User Roles and Permissions Migration

✔ WordPress stores user roles in wp_usermeta.
✔ Roles may be lost if improperly migrated.

📌 Solution: Export user roles separately.

function get_user_roles() {
    global $wp_roles;
    return $wp_roles->roles;
}
print_r(get_user_roles());

Manually reassign them using a plugin like User Role Editor post-migration.

5. Shortcodes and Widgets Migration

✔ Shortcodes are stored in wp_posts but depend on plugin availability.
✔ Widgets are stored in wp_options (widget_ prefixed values).

📌 Solution:

Re-register shortcodes in a plugin.
Use Widget Importer & Exporter Plugin for widgets.

Step-by-Step Guide for WordPress Database Custom Functionality Migration

Step 1: Backup Your WordPress Database

✔ Use UpdraftPlus, WP-DB-Backup, or WP-CLI.

wp db export backup.sql

Step 2: Set Up a Staging Environment

✔ Use Local by Flywheel, WP Staging, or SiteGround Staging to test migrations before deploying live.

Step 3: Identify and Document Custom Functionalities

✔ List all CPTs, taxonomies, user roles, and shortcodes that need migration.
✔ Check functions.php and the wp_options table for theme-dependent features.

Step 4: Export and Import the WordPress Database

✔ Export using WP-CLI:

wp db export site-db.sql

✔ Import to the new site:

wp db import site-db.sql

Step 5: Ensure Plugin Settings Are Retained

✔ Use plugin-specific export tools if available.
✔ Check wp_options and wp_postmeta for custom plugin settings.

Step 6: Verify and Fix Broken Functionalities

✔ Test CPTs, shortcodes, widgets, and user roles.
✔ If a shortcode breaks, check if the related plugin is active.
✔ Flush permalinks to restore URL structures:

wp rewrite flush

Step 7: Go Live and Monitor Performance

✔ Deploy the migrated site only after thorough testing.
✔ Monitor site speed, error logs, and missing functionalities.

Best Practices for WordPress Database Custom Functionality Migration

✔ Use a Staging Site: Test everything before deploying.
✔ Convert Theme-Dependent Features to Plugins: Avoid reliance on themes.
✔ Export Database Selectively: Migrate only necessary tables to avoid clutter.
✔ Verify Data Integrity Post-Migration: Run SQL queries to check missing records.
✔ Ensure Plugin Compatibility: Update all plugins before migration.

Frequently Asked Questions (FAQs)

1. What happens if I don’t migrate the WordPress database properly?

✅ You may lose custom functionalities, plugin settings, user roles, and shortcodes. A structured migration process prevents data loss.

2. Can I migrate only custom functionalities without moving the entire database?

✅ Yes, you can selectively export tables like wp_postmeta, wp_options, and wp_terms to retain only custom functionalities.

3. How do I fix broken shortcodes after migration?

✅ Ensure the required plugins are active. If shortcodes were theme-dependent, register them in a separate plugin.

4. Why are my custom post types missing after migration?

✅ They may not be registered in the new theme/plugin. Manually register them using register_post_type().

5. Do I need a developer for database custom functionality migration?

✅ If you’re comfortable with PHP, SQL, and WP-CLI, you can do it yourself. Otherwise, hiring a WordPress developer ensures a smooth transition.