A new version of PHPCache is available.

This one has 5 new methods:

PHPCache::set_expire($key)
Which will set the expiration of the cache record for $key in the past, I think this method has some advantages over deleting the key all together.

PHPCache::remove($key)
Will completely remove the row.

PHPCache::clean_up()
This method will be called when ever you construct/configure a new PHPCache object with PHPCache::configure($database) method and does two things:

1 - Will delete all the old keys on the table, you can control how often this happens with 2 constants:
PHPCACHE_GC_PROBABILITY & PHPCACHE_GC_DIVISOR
If you set PHPCACHE_GC_PROBABILITY to 10 and PHPCACHE_GC_DIVISOR to 100, then when ever you configure the PHPCache object with PHPCache::configure($database); there will be 10% chance that the garbage collector will delete the old rows.
The default value is 1%.

2 - It will optimize the table PHPCache is using, you can also control how often this happens through 2 other constants:
PHPCACHE_TO_PROBABILITY & PHPCACHE_TO_DIVISOR
It works similar to #1 and default value is 10%.

PHPCache::gc()
Will delete the old rows anytime you call this method, it doesn’t care about PHPCACHE_GC_PROBABILITY & PHPCACHE_GC_DIVISOR
One place to use this would be a cron tab.

PHPCache::optimize_table()
Will optimize PHPCache’s table and doesn’t care about
PHPCACHE_TO_PROBABILITY & PHPCACHE_TO_DIVISOR

This new version has some more minor improvements over the old one too.