PHP 5 >= 5.1.2, PHP 7, PHP 8, PECL hash >= 1.1
hash_hmac - Generate a keyed hash value using the HMAC method

hash_hmac( string$algo, string$data, string$key, [bool$binary = false] ): string



Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..) See hash_hmac_algos for a list of supported algorithms.


Message to be hashed.


Shared secret key used for generating the HMAC variant of the message digest.


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 binary is set to true in which case the raw binary representation of the message digest is returned.


Version Description
8.0.0 hash_hmac now throws a ValueError exception if algo is unknown or is a non-cryptographic hash function; previously, false was returned instead.
7.2.0 Usage of non-cryptographic hash functions (adler32, crc32, crc32b, fnv132, fnv1a32, fnv164, fnv1a64, joaat) was disabled.

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Example of hash_hmac

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Function hash_hmac:

HASH Message Digest Framework Functions

Most used PHP functions