Scott Taylor 84a26a78a8 Cache get_term_by() calls: ...

* Add a helper function, `wp_get_last_changed()`, to retrieve a last-modified timestamp by cache group
* When caching a term, also make cache entries for slug and name via `slug:{$term_id}` and `name:{$term_id}` keys in the `$taxonomy:$last_changed` bucket that reference the term_id
* In `clean_term_cache()` and `update_term_cache()`, respect `$_wp_suspend_cache_invalidation`
* Original term cache entries maintain BC

Adds unit tests.

Props wonderboymusic, tollmanz, boonebgorges.
Fixes #21760.

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git-svn-id: http://core.svn.wordpress.org/trunk@29668 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2014-10-16 04:45:17 +00:00

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