php framework - Zend Framework 1 clean cache not working?

Question

I use the following statement to clear the cache:

        $cache->clean(Zend_Cache::CLEANING_MODE_MATCHING_TAG,array($uid,'PERMISSIONS'));

There is no way to clear the cache at this time, I made sure the tags consisting of $uid and PERMISSIONS are correct. My cache save code is:

            $cache_tag=array($uid,'PERMISSIONS');
            $cache->save($cache_data,$cache_id,$cache_tag);

When I use the following method, it can be cleared

       $cache->clean(Zend_Cache::CLEANING_MODE_ALL);

Why is this? ?

Answer 1

Solved, the reason is that zf’s memcache cache does not support tag removal, see the source code

Answer 2