hash_init

hash_init - Initialize an incremental hashing context

Описание

resource hash_init ( string algo [, int options, string key] )

Список параметров

algo

Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..)

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.

Возвращаемые значения

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

Примеры

Пример 1. Incremental hashing example

$ctx = hash_init('md5');
hash_update($ctx, 'The quick brown fox ');
hash_update($ctx, 'jumped over the lazy dog.');
echo hash_final($ctx);

Результат выполнения данного примера:

5c6ffbdd40d9556b73a21e63c3e0e904

hash()hash_file()hash_hmac()hash_hmac_file()

Смотрите также:

Описание на ru2.php.net
Описание на php.ru