WordPress Release: 2.2.0

TL;DR

WordPress 2.2 "Getz" introduces a major new feature with native widget support, allowing users to customize their sidebars without editing code. This release also includes numerous performance improvements, bug fixes, and enhancements to the admin interface. The filter system has been optimized to reduce bottlenecks, and several security improvements have been implemented. WordPress 2.2 represents a significant step forward in making the platform more user-friendly while maintaining its flexibility for developers.

Highlight of the Release

• Native widget support for customizing sidebars without editing code
• Performance improvements to the filter system reducing bottlenecks
• TinyMCE editor upgraded to version 2.1.0
• Dynamic comment list refreshing when comments are deleted or marked as spam
• New 'Deactivate All Plugins' feature for troubleshooting
• Improved feed titles showing more relevant information

Migration Guide

Upgrading to WordPress 2.2

1. Back up your database and files before upgrading.

2. Widget Plugin Users: If you were using the Widgets plugin from Automattic, it will be automatically deactivated as widgets are now part of the core. Your existing widget settings will be preserved.

3. Theme Developers: If your theme doesn't already support widgets, you'll need to add the following code to your sidebar.php file to enable widget support:

<?php if ( function_exists('dynamic_sidebar') && dynamic_sidebar() ) : else : ?>
    <!-- Your default sidebar content here -->
<?php endif; ?>

4. Plugin Developers:

   • The filter system has been optimized. If you were relying on specific behavior of the filter system, test your plugins thoroughly.
   • New hooks are available, including get_sidebar action and the_meta_key filter.
   • The url_to_postid filter has been added for URL handling.

5. Configuration Constants: WordPress now supports WP_HOME and WP_SITEURL constants in wp-config.php, which will override the database settings for these values.

6. Language Files: Language files have been moved from wp-includes/languages to wp-content/languages. Update your wp-config.php if you're using a non-English installation.

Upgrade Recommendations

Recommended for all users: WordPress 2.2 includes significant performance improvements and security enhancements that benefit all users. The new widget functionality makes WordPress more accessible to non-technical users who want to customize their sites.

Priority: Medium to High

Timing:

• For personal blogs and small sites: Upgrade at your convenience, but it's recommended to do so within a month.
• For larger sites or those with custom themes/plugins: Test the upgrade in a staging environment first to ensure compatibility with your customizations.

Preparation:

1. Back up your database and files completely before upgrading
2. Check if your plugins are compatible with WordPress 2.2
3. If you have a heavily customized theme, review the widget implementation requirements
4. Set aside time to test your site functionality after the upgrade

The widget functionality alone makes this upgrade worthwhile for most users, and the performance improvements will benefit sites of all sizes.

Bug Fixes

Comment Management Fixes

• Dynamic comment list refreshing when a comment is deleted or marked as spam
• Fixed encoding of categories added over AJAX
• Improved handling of comments awaiting moderation for their authors

Admin Interface Fixes

• Fixed rich editing checkbox on user-edit page to prevent settings from being reset
• Fixed inline uploader page links
• Fixed double header when WP importer file upload fails
• Fixed WebKit browser compatibility for TinyMCE editor

Permalink and URL Handling

• Fixed fancy permalinks on draft previews
• Fixed URL handling in add_query_arg() to properly encode values
• Fixed robots.txt to be served with the correct content type (text/plain)

Internationalization Fixes

• Added fallback to English for TinyMCE if requested locale is not available
• Fixed gettext's plural forms for more than 2 plural forms
• Improved translation support throughout the application

Other Fixes

• Fixed wp_title() to correctly display months
• Fixed empty list output in various functions
• Fixed non-object error when wp_die() is called before $wp object is instantiated
• Fixed double encoding of gzip output if gzip is already set in php.ini
• Fixed handling of PHP 5.2.2 compatibility issues

New Features

Native Widget Support

WordPress 2.2 introduces built-in widget support, allowing users to customize their sidebars without editing code. This feature was previously available only through a plugin. The core now includes several default widgets:

• Categories (with dropdown option)
• Archives (with dropdown option)
• Pages
• Calendar
• Recent Posts
• Recent Comments
• Search
• Text
• RSS

Deactivate All Plugins

A new "Deactivate All Plugins" feature has been added to help troubleshoot plugin conflicts and issues. This provides a quick way to disable all active plugins at once.

Enhanced Feed Titles

Feed titles now show more relevant information, including the current category, date, and other contextual information, making feeds more descriptive and useful.

Widget Support in Default Themes

Both default themes (Default and Classic) now include widget support out of the box, making it easier for users to take advantage of the new widget functionality.

Security Updates

Input Validation and Sanitization

• Improved URL sanitization with additional int casts and clean_url calls
• Better handling of HTTP methods, including returning 405 status code when wp-comments-post.php is requested with GET instead of POST

Nonce Implementation

• Added nonces to importers for better security
• Added nonce to avoid "Are You Sure" dialog when restoring image header

Output Escaping

• Improved attribute escaping in the OPML feed title
• Better escaping throughout the widgets interface

Performance Improvements

Filter System Optimization

Major performance improvements have been made to the filter system, addressing bottlenecks found using xdebug and kcachegrind. The merge_filters() function was being called over 1000 times in some cases, and this has been optimized.

Category Listing Speed Improvements

The category hierarchy is now cached, making category listing significantly faster. This improves performance throughout the admin interface and on the frontend when displaying category lists.

Reduced Database Queries

• Speed improvements to wp_list_authors() by consolidating database queries
• Optimized option retrieval by calling get_option('siteurl') outside loops to save dozens of redundant calls

Admin Interface Performance

• Improved write page loading speed by converting most buttons to an image map
• Removed slow-loading iframe in favor of a popup link in certain admin screens

Impact Summary

WordPress 2.2 "Getz" represents a significant step forward in WordPress's evolution, particularly in making the platform more accessible to non-technical users through the introduction of native widget support. This feature allows users to customize their sidebars without touching code, democratizing site customization.

Performance improvements are another major highlight of this release. The optimization of the filter system addresses bottlenecks that were affecting site speed, and the caching of category hierarchies improves performance throughout the application. These changes will be particularly noticeable on larger sites with complex themes and many plugins.

For developers, WordPress 2.2 offers new hooks and filters, enhancing the platform's extensibility. The addition of the widget API opens up new possibilities for plugin developers to create sidebar tools that users can easily implement.

Security has also been improved with better input validation, sanitization, and the implementation of nonces in various parts of the application. These changes help protect WordPress sites from common vulnerabilities.

The upgrade to TinyMCE 2.1.0 enhances the content creation experience, while improvements to comment management make moderation more efficient. The new "Deactivate All Plugins" feature simplifies troubleshooting, which will be appreciated by administrators and support professionals.

Overall, WordPress 2.2 balances user-facing improvements with under-the-hood enhancements that strengthen the platform's foundation, making it more robust, user-friendly, and performant.