(PHP 5 >= 5.1.2, PECL hash >= 1.1)
hash_hmac_file — Generate a keyed hash value using the HMAC method and the contents of a given file
Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..) See hash_algos() for a list of supported algorithms.
URL describing location of file to be hashed; Supports fopen wrappers.
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.
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.
Example #1 hash_hmac_file() example
<?php
/* Create a file to calculate hash of */
file_put_contents('example.txt', 'The quick brown fox jumped over the lazy dog.');
echo hash_hmac_file('md5', 'example.txt', 'secret');
?>
以上例程会输出：
7eb2b5c37443418fc77c136dd20e859c