Permit execution of wp_cache_flush() on multisite before ms-settings.php is loaded

[danielbachhuber]

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

[danielbachhuber]

Huh. Now that I've published this, ms_network_not_found could work just fine.

[schlessera]

Closing this as resolved-wontfix here, as the specific issue mentioned in the ticket has been solved in WP-CLI using ms_network_not_found.