upgrade_420() Execute changes made in WordPress 4.2.0. ContentsDescription Source Changelog User Contributed Notes Description #Description Source #Source File: wp-admin/includes/upgrade.php Expand full source code Collapse full source code View on Trac Top ↑Changelog #Changelog Changelog Version Description 4.2.0 Introduced. Top ↑User Contributed Notes #User Contributed Notes You must log in before being able to contribute a note or feedback.