PHP 手册
上一页下一页


hash_init

(no version information, might be only in CVS)

hash_init -- Initialize an incremental hashing context

说明

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

参数

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.

返回值

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

范例

例 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);
?>

上例将输出：

5c6ffbdd40d9556b73a21e63c3e0e904

参见

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



上一页起始页下一页
hash_hmac上一级hash_update_file