预定义常量
下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。
APC_ITER_ALL(int)APC_ITER_ATIME(int)APC_ITER_CTIME(int)APC_ITER_DEVICE(int)APC_ITER_DTIME(int)APC_ITER_FILENAME(int)APC_ITER_INODE(int)APC_ITER_KEY(int)APC_ITER_MD5(int)APC_ITER_MEM_SIZE(int)APC_ITER_MTIME(int)APC_ITER_NONE(int)APC_ITER_NUM_HITS(int)APC_ITER_REFCOUNT(int)APC_ITER_TTL(int)APC_ITER_TYPE(int)APC_ITER_VALUE(int)APC_LIST_ACTIVE(int)APC_LIST_DELETED(int)
