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)