Using ApcIterator instead of loading all cache_info into memory

[MikeSorokin]

Hello!
Did you consider switching from apc_cache_info way to APC[U]Iterator on some commands like apcu:regexp:delete. Iterator would allow to significally descrease memory consumption, especially on servers with low php.memory_limit and large apc cache size.
For now (using 1.11.0 version with php 5.4.45) I can`t even clear cache by regexp if php.memory_limit = 128M and apc.shm_size = 1G because of size of apcu_cache_info's data.
And this logic still remain in 2.* versions as I see.

[themightychris]

It might be because APCIterator is extremely prone to crashing PHP with the version of apcu that ships with Ubuntu 14.04. I've tried for a long time to get them to update it but it doesn't seem to matter what anyone says: https://bugs.launchpad.net/ubuntu/+source/php-apcu/+bug/1374892

Maybe detecting the apcu version and only using the memory intense method for the versions < 4.0.6 is in order?

[MikeSorokin]

Well, we probably could use some configurable logic in this case, I suppose. I don`t say - to do checking for version inside tool itself, I mean - to use config options for this.
Also - is this the only reason to not use Iterator at all?

[themightychris]

AFAIK yes, that's the only reason not to use the iterator