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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

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

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


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