Ryan Boren 691425a3ff Introduce wp_cache_switch_to_blog() and WP_Object_Cache::switch_to_blog() as a lighter/faster way to switch the cache to a new blog id. ...

Add the blog id to the cache keys for multisite installs.

Use wp_cache_switch_to_blog() instead of wp_cache_init() in switch_to_blog().

Use wp_cache_switch_to_blog() instead of wp_cache_reset() in wp_start_object_cache().

Deprecate wp_cache_reset().

This avoids the many queries needed to re-prime the cache after switch_to_blog() on multisite installs using the default cache backend.

fixes #21434



git-svn-id: https://develop.svn.wordpress.org/trunk@21403 602fd350-edb4-49c9-b593-d223f7449a82

2012-08-02 18:31:14 +00:00

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