mhash

Compute hash (PHP 4, PHP 5)
string mhash ( int hash, string data [, string key] )

mhash() applies a hash function specified by hash to the data.

hash: The hash id. One of the MHASH_XXX constants.
data: The user input, as a string.
key: If 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 errors.

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