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On Saturday, March 29, 2008, WordPress 2.5 was released. For information on the changes and improvements in this new version, see the Changelog for 2.5.

The database version (db_version in wp_option) is 7558.

See WordPress 2.5 Theme Compatibility and Plugin Compatibility to confirm the theme and plugins you're using are compatible.

Changes in Minimum Requirements

• PHP 4.3 or greater (old requirement was PHP 4.2 or greater).

New User Features

• Administration Panels redesign (see WordPress Interface Guidelines)
• Widget-based dashboard
• You should be able to have any number of any widgets
• Search for both posts and pages (#1435)

Developer

• Use $wpdb->prepare everywhere
• Switch to expect unescaped data for internal functions
• XML-RPC refactor
• Plugabble media buttons
• Shortcode API