Php/docs/yac.constants
From Get docs
Predefined Constants
The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
YAC_VERSION(string)YAC_MAX_KEY_LEN(int)- Max length of a key could be, it is 48 bytes.
YAC_MAX_VALUE_RAW_LEN(int)YAC_MAX_RAW_COMPRESSED_LEN(int)YAC_SERIALIZER_PHP(int)- Use php serialize as serializer
YAC_SERIALIZER_JSON(int)- Use json as serializer(requrie --enable-json)
YAC_SERIALIZER_IGBINARY(int)- Use igbinary as serializer(require --enable-igbinary)
YAC_SERIALIZER_MSGPACK(int)- Use msgpack as serializer(require --enable-msgpack)
YAC_SERIALIZER(string)- Which serialzier is yac used
