## 例

`

     string hash_hmac_file ( string $algo , string $filename , string $key [, bool $raw_output = false ] )

`

## 説明

Generate a keyed hash value using the HMAC method and the contents of a given file

## 戻り値

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.