[wp-trac] [WordPress Trac] #4476: Delete Cache by Group

[WordPress Trac]

#4476: Delete Cache by Group
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 Reporter:  filosofo         |       Owner:  (none)
     Type:  enhancement      |      Status:  reopened
 Priority:  normal           |   Milestone:
Component:  Cache API        |     Version:  2.2
 Severity:  normal           |  Resolution:
 Keywords:  has-patch close  |     Focuses:
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Changes (by dhilditch):

 * status:  closed => reopened
 * resolution:  wontfix =>


Comment:

 Instead of adding 'delete by group', to achieve the same desired
 functionality - namely, the ability to 'delete' chunks from the cache
 without wiping the entire cache - how about this approach:

 1. Add an extra parameter to wp_cache_get and wp_cache_set called
 'namespace'
 2. When the namespace parameter exists, use the code given by @scribu to
 append a number to the $key param
 3. Add a new function wp_cache_clear_namespace with the namespace
 parameter - this function increments the namespace number so - in-effect -
 all items for this namespace are 'deleted'.

 Otherwise EVERY developer has to keep coding their own versions of the
 code from @scribu both for getting items from the cache and for setting
 items in the cache, and most won't bother and instead will just flush the
 entire cache when their settings pages change which is entirely
 unnecessary and detrimental to the performance of large websites.

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Ticket URL: <https://core.trac.wordpress.org/ticket/4476#comment:15>
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