MHASH_ADLER32 = 18
MHASH_CRC32 = 0
MHASH_CRC32B = 9
MHASH_GOST = 8
MHASH_HAVAL128 = 13
MHASH_HAVAL160 = 12
MHASH_HAVAL192 = 11
MHASH_HAVAL256 = 3
MHASH_MD4 = 16
MHASH_MD5 = 1
MHASH_RIPEMD160 = 5
MHASH_SHA1 = 2
MHASH_SHA256 = 17
MHASH_TIGER = 7
MHASH_TIGER128 = 14
MHASH_TIGER160 = 15
void mhash( $hashtype, $data, [ $key = ''])