[wp-trac] [WordPress Trac] #31392: Undefined function error on mu-plugin during update/upgrade

[WordPress Trac]

#31392: Undefined function error on mu-plugin during update/upgrade
-----------------------------+----------------------
 Reporter:  jadpm            |       Owner:
     Type:  defect (bug)     |      Status:  closed
 Priority:  normal           |   Milestone:
Component:  Upgrade/Install  |     Version:  trunk
 Severity:  normal           |  Resolution:  invalid
 Keywords:                   |     Focuses:
-----------------------------+----------------------
Changes (by jeremyfelt):

 * status:  new => closed
 * resolution:   => invalid
 * milestone:  Awaiting Review =>


Comment:

 Hi jadpm, thanks for opening a ticket.

 Standard plugins are not available during the upgrade process. When
 `upgrade.php` is called, the `WP_INSTALLING` constant is defined and
 `wp_get_active_and_valid_plugins()` will provide an empty array of plugins
 so that the upgrade process can do its thing.

 The best way around this is to add a check of your own in the mu-plugin
 for `defined( 'WP_INSTALLING' )`.

--
Ticket URL: <https://core.trac.wordpress.org/ticket/31392#comment:2>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform