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。
YAC_VERSION
(string) YAC_MAX_KEY_LEN
(int) YAC_MAX_VALUE_RAW_LEN
(int) YAC_MAX_RAW_COMPRESSED_LEN
(int) YAC_SERIALIZER_PHP
(int) YAC_SERIALIZER_JSON
(int) YAC_SERIALIZER_IGBINARY
(int) YAC_SERIALIZER_MSGPACK
(int) YAC_SERIALIZER
(string)