**Update 06/23 **
At this point I was able to isolate the issue to a simple example. Firstly I store some example items:
apc_add('MY_APC_TESTA_1','1');
apc_add('MY_APC_TESTA_2','2');
apc_add('MY_APC_TESTA_3','3');
apc_add('MY_APC_TESTB_4','4');
apc_add('MY_APC_TESTB_5','5');
apc_add('MY_APC_TESTB_6','6');
Then I use APCIterator for retrieving the items, counting them with a foreach loop and additionally using getTotalCounts method of apciterator class for double checking.
$iterator = new APCIterator('user', '/^MY_APC/', APC_ITER_VALUE);
function showCache() {
echo "keys in cache<br>-------------<br>";
foreach ($items AS $key => $value) {
echo $key . "<br>";
}
}
$i = 0;
foreach ($iterator as $current_item) {
$i++;
}
echo 'getTotalCount: '.$iterator->getTotalCount().'<br>'; // output: 6
echo 'foreach count: '.$i.'<br>'; // output: 6
showCache();
Calling this script right after storing the items I am getting this output:
getTotalCount: 6
foreach count: 6
keys in cache
-------------
MY_APC_TESTA_1
MY_APC_TESTA_2
...
Calling this script couple of hours or a day later I receive this output:
getTotalCount: 6
foreach count: 0
keys in cache
-------------
So as you can see the iterator class can still retrieve the total count using its method getTotalCount but a foreach loop brings empty results although it was working a couple of hours earlier. That's the reason why my cache handlers are not working because they are using apciterator in conjunction with apc_delete($iterator) to get corresponding items and clear them once a modification was made. Since the foreach/array is empty there is nothing to delete. This is a huge problem. I don't assume that this is expected behavior. Any ideas how is this possible?
I am having the following setup on my VPS:
APC Settings:
apc.cache_by_default 1
apc.canonicalize 1
apc.coredump_unmap 0
apc.enable_cli 0
apc.enabled 1
apc.file_md5 0
apc.file_update_protection 2
apc.filters
apc.gc_ttl 3600
apc.include_once_override 0
apc.lazy_classes 0
apc.lazy_functions 0
apc.max_file_size 1M
apc.mmap_file_mask /tmp/apc.Z1n8dS
apc.num_files_hint 512
apc.preload_path
apc.report_autofilter 0
apc.rfc1867 0
apc.rfc1867_freq 0
apc.rfc1867_name APC_UPLOAD_PROGRESS
apc.rfc1867_prefix upload_
apc.rfc1867_ttl 3600
apc.serializer default
apc.shm_segments 1
apc.shm_size 256M
apc.shm_strings_buffer 4M
apc.slam_defense 1
apc.stat 1
apc.stat_ctime 0
apc.ttl 7200
apc.use_request_time 1
apc.user_entries_hint 4096
apc.user_ttl 7200
apc.write_lock 1
APCIterator erroneously only returns cache entries that are younger than apc.ttl, but it includes these in the number returned by getTotalCount().
I've submitted a pull request for this bug here: https://github.com/krakjoe/apcu/pull/253