hash_hmac_file

(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

说明

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

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

参见

hash_hmac() - Generate a keyed hash value using the HMAC method
hash_file() - Generate a hash value using the contents of a given file