Hash Functions
PHP Manual

hash_init

(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1)

hash_initInitialize an incremental hashing context

Description

HashContext hash_init ( string $algo [, int $options = 0 [, string $key = NULL ]] )

Parameters

algo

Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..). For a list of supported algorithms see hash_algos().

options

Optional settings for hash generation, currently supports only one option: HASH_HMAC. When specified, the key must be specified.

key

When HASH_HMAC is specified for options, a shared secret key to be used with the HMAC hashing method must be supplied in this parameter.

Return Values

Returns a Hashing Context for use with hash_update(), hash_update_stream(), hash_update_file(), and hash_final().

Changelog

Version Description
7.2.0 Usage of non-cryptographic hash functions (adler32, crc32, crc32b, fnv132, fnv1a32, fnv164, fnv1a64, joaat) with HASH_HMAC was disabled.
7.2.0 Return HashContext instead of resource.

Examples

Example #1 Incremental hashing example

<?php
$ctx 
hash_init('md5');
hash_update($ctx'The quick brown fox ');
hash_update($ctx'jumped over the lazy dog.');
echo 
hash_final($ctx);
?>

The above example will output:

5c6ffbdd40d9556b73a21e63c3e0e904

See Also


Hash Functions
PHP Manual