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。
Here is a list of hashes which are currently supported by mhash. If a hash is not listed here, but it is listed in the mhash documentation as supported, you can safely assume that this documentation is outdated.
MHASH_ADLER32
MHASH_CRC32
MHASH_CRC32B
MHASH_GOST
MHASH_HAVAL128
MHASH_HAVAL160
MHASH_HAVAL192
MHASH_HAVAL224
MHASH_HAVAL256
MHASH_MD2
MHASH_MD4
MHASH_MD5
MHASH_RIPEMD128
MHASH_RIPEMD256
MHASH_RIPEMD320
MHASH_SHA1
MHASH_SHA192
MHASH_SHA224
MHASH_SHA256
MHASH_SHA384
MHASH_SHA512
MHASH_SNEFRU128
MHASH_SNEFRU256
MHASH_TIGER
MHASH_TIGER128
MHASH_TIGER160
MHASH_WHIRLPOOL