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During HYS and 2 months after a new version releases, let's add a dismissable banner to the top of the admin control panel to encourage site admins to upgrade their PHP to the latest version their forum supports. We need to help encourage admins to update PHP so that XF developers can use the latest language advancements sooner, and spend less time using older language versions. This will increase productivity.

Starting in XF 2.3, addons should require a new property in their metadata that specifies a range or list of PHP versions it supports. That can be queried to determine the latest PHP version someone's forum supports.