APC User Cache
 
-  简介 
-  安装/配置 
-  预定义常量 
-  APCu 函数 
-  apcu_add — Cache a new variable in the data store
-  apcu_cache_info — Retrieves cached information from APCu's data store
-  apcu_cas — Updates an old value with a new value
-  apcu_clear_cache — Clears the APCu cache
-  apcu_dec — Decrease a stored number
-  apcu_delete — Removes a stored variable from the cache
-  apcu_entry — Atomically fetch or generate a cache entry
-  apcu_exists — Checks if entry exists
-  apcu_fetch — Fetch a stored variable from the cache
-  apcu_inc — Increase a stored number
-  apcu_sma_info — Retrieves APCu Shared Memory Allocation information
-  apcu_store — Cache a variable in the data store
 
-  APCUIterator — The APCUIterator class
-  APCUIterator::__construct — Constructs an APCUIterator iterator object
-  APCUIterator::current — Get current item
-  APCUIterator::getTotalCount — Get total count
-  APCUIterator::getTotalHits — Get total cache hits
-  APCUIterator::getTotalSize — Get total cache size
-  APCUIterator::key — Get iterator key
-  APCUIterator::next — Move pointer to next item
-  APCUIterator::rewind — Rewinds iterator
-  APCUIterator::valid — Checks if current position is valid