Aaron Jorbin 82911b1756 Cache API: introduce wp_cache_get_last_changed to improve DRY ...

One thing fairly common to the cache groups is a block of code to look to see when the cache was last changed, and if there isn't one, to set it for the current microtime(). It appears in 8 different places in core. This adds a new helper `wp_cache_get_last_changed` to DRY things up a bit.

Since `wp-includes/cache.php` isn't guaranteed to be loaded, this new function is in `wp-includes/functions.php`

Props spacedmonkey, desrosj.
Fixes #37464.


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git-svn-id: http://core.svn.wordpress.org/trunk@38792 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-10-21 02:54:34 +00:00

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