hash_init
(PHP 5 >= 5.1.2, PECL hash >= 1.1)
hash_init — Initialize an incremental hashing context
Description
$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, thekeymust be specified. -
key -
When
HASH_HMACis specified foroptions, a shared secret key to be used with the HMAC hashing method must be supplied in this parameter.
Return Values
Returns a Hashing Context resource for use with hash_update(), hash_update_stream(), hash_update_file(), and hash_final().
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() - Generate a hash value (message digest)
- hash_algos() - Return a list of registered hashing algorithms
- hash_file() - Generate a hash value using the contents of a given file
- hash_hmac() - Generate a keyed hash value using the HMAC method
- hash_hmac_file() - Generate a keyed hash value using the HMAC method and the contents of a given file
Коментарии
Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas Horas