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hash_hmac ( string $algo , string $data , string $key [, bool $raw_output = FALSE ] ) : string

algo: Ҫʹ�õĹ�ϣ�㷨��ƣ��磺"md5"��"sha256"��"haval160,4" �ȡ� ��λ�ȡ��֧�ֵ��㷨�嵥��μ� hash_hmac_algos() ��
data: Ҫ��й�ϣ��Ϣ��
key: ʹ�� HMAC ��ϢժҪʱ��ʹ�õ��Կ��
raw_output: ��Ϊ TRUE ��ԭʼ��ݣ� ��Ϊ FALSE ��Сд 16 ��ַ��

�� raw_output ��Ϊ TRUE�� 򷵻�ԭʼ��ݱ�ʾ��ϢժҪ�� 򷵻� 16 ��Сд�ַ��ʽ��ʾ��ϢժҪ�� algo ��ָ��Ĳ��֧�ֵ��㷨�� FALSE��

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Example #1 hash_hmac() ��


<?php
echo hash_hmac('ripemd160', 'The quick brown fox jumped over the lazy dog.', 'secret');
?>

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hash() - ��ɹ�ϣֵ ��ϢժҪ��
hash_hmac_algos() - Return a list of registered hashing algorithms suitable for hash_hmac
hash_init() - ��ʼ��ϣ��
hash_hmac_file() - ʹ�� HMAC ��͸��ļ��ɴ��Կ�Ĺ�ϣֵ

hash_hmac