setup-config.php Fatal error: Cannot redeclare add_filter()

[michalzuber]

Without wp-config.php I get
Fatal error: Cannot redeclare add_filter() (previously declared in /Volumes/data/Sites/wp_git/wp-includes/plugin.php:82) in /Volumes/data/Sites/wp_git/wp-includes/plugin.php on line 89

[michalzuber]

Issue is in wp-settings.php on line 75 there's only require. It conflicts with wp-admin/setup-config.php:33

[SergeyBiryukov]

Confirmed. See [28978].

With setup-config.patch​, wp_load_translations_early() never fires, it's added too late.

I guess we need to change require() to require_once() in wp-settings.php.

[nacin]

Weird. I thought this was already a require_once(), and it was working for me. Turns out it was due to a buggy opcode cache. (This was less than fun to track down.)

[nacin]

In 29005:

Don't include plugin.php twice in setup-config.php.

fixes #28744. see #28740, [28978].