(PHP 4, PHP 5)
mhash — Computes hash
$hash
   , string $data
   [, string $key
  ] )
   mhash() applies a hash function specified by
   hash to the data.
  
hash
       The hash ID. One of the MHASH_hashname constants.
      
dataThe user input, as a string.
keyIf specified, the function will return the resulting HMAC instead. HMAC is keyed hashing for message authentication, or simply a message digest that depends on the specified key. Not all algorithms supported in mhash can be used in HMAC mode.
   Returns the resulting hash (also called digest) or HMAC as a string, or
   FALSE on error.