hash_hmac_file
(PHP 5 >= 5.1.2, PECL hash:1.1-1.5)
hash_hmac_file — Generate a keyed hash value using the HMAC method and the contents of a given file
说明
参数
- algo
-
Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..)
- filename
-
URL describing location of file to be hashed; Supports fopen wrappers.
- key
-
Shared secret key used for generating the HMAC variant of the message digest.
- raw_output
-
When set to TRUE, outputs raw binary data. Default value (FALSE) outputs lowercase hexits.
返回值
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.
范例
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');
?>
上例将输出：
7eb2b5c37443418fc77c136dd20e859c
