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I'm looking to run some migration related code when my plugin is updated to the next release. I've researched and yet to find any sort of hook/trigger which will be called when a plugin has successfully upgraded.

All the suggestions I've found so far suggest to run migration on admin_init() and cross check a stored plugin version in options. But this seems like a really "hacky" solution and would imagine there must be a more structured way to run migrations (database related) when a plugin is updated from a pervious version.

What is the best way to trigger migration code for a plugin when it has been updated both manually and automatically?

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plugin update in WordPress is basically removing it and installing again, so there is no special hook for this action.

So this hacky solution is the best one:

  • Save in options your last version
  • On init, check if current version is newer than saved version
  • If yes, perform your SQL actions
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  • With the "On Init", surely that will require the user to visit the admin/settings page for the plugin otherwise the site could stay broken until they do if migration is breaking changes (ie: changing options names)
    – David
    Commented Mar 29, 2023 at 9:40
  • Init is called at the beginning, before options are loaded, or content is printed: codex.wordpress.org/Plugin_API/Action_Reference It is safe to make such changes on init.
    – mWin
    Commented Mar 30, 2023 at 10:22

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