Hash 函数
PHP Manual

hash_init

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

hash_initInitialize an incremental hashing context

说明

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

参数

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.

返回值

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

范例

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);
?>

以上例程会输出:

5c6ffbdd40d9556b73a21e63c3e0e904

参见


Hash 函数
PHP Manual