hash_hmac hash in php

hash_hmac — Generate a keyed hash value using the HMAC method
string hash_hmac ( string $algo , string $data , string $key [, bool $raw_output = FALSE ] )
Parameters ::
algo
Name of selected hashing algorithm (i.e. “md5”, “sha256”, “haval160,4”, etc..) See hash_hmac_algos() for a list of supported algorithms.
data
Message to be hashed.
key
Shared secret key used for generating the HMAC variant of the message digest.
raw_output
When set to TRUE, outputs raw binary data. FALSE outputs lowercase hexits.
Return Values ::
Returns a string containing the calculated message digest as lowercase hexits unless raw_output is set to true in which case the raw binary representation of the message digest is returned. Returns FALSE when algo is unknown.
# EXAMPLE::
<?php
echo hash_hmac(‘ripemd160’, ‘The quick brown fox jumped over the lazy dog.’, ‘secret’);
?>
# The above example will output:
b8e7ae12510bdfb1812e463a7f086122cf37e4f7
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