[wp-trac] [WordPress Trac] #42262: Permit execution of wp_cache_flush() on multisite before ms-settings.php is loaded

[WordPress Trac]

#42262: Permit execution of wp_cache_flush() on multisite before ms-settings.php is
loaded
-----------------------------+----------------------------
 Reporter:  danielbachhuber  |      Owner:
     Type:  enhancement      |     Status:  new
 Priority:  normal           |  Milestone:  Future Release
Component:  Bootstrap/Load   |    Version:
 Severity:  normal           |   Keywords:  needs-patch
  Focuses:  multisite        |
-----------------------------+----------------------------
 On WordPress multisite, it would be useful to be able to execute
 `wp_cache_flush()` before `ms-settings.php` is loaded.

 When a WP-CLI user runs `wp cache flush` against a WordPress multisite
 instance that has a stale domain lookup value, they'll see an error like:

 {{{
 Error: Site 'mstest.org/' not found. Verify DOMAIN_CURRENT_SITE matches an
 existing site or use `--url=<url>` to override.
 }}}

 To bypass the error and flush the cache, the user must run `wp cache flush
 --url=<old-domain>`, where `<old-domain>` is the stale domain lookup
 value.

 `wp_cache_flush()` doesn't require blog-specific context though, so it's
 safe to run as soon as the object cache is instantiated.

 Open to suggestions on an implementation. One thought is to add a
 `ms_before_load` action that WP-CLI can hook into (although it'd then need
 to throw an exception to pause script execution).

 Related https://github.com/wp-cli/cache-command/issues/17

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Ticket URL: <https://core.trac.wordpress.org/ticket/42262>
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