hash_hmachash_init
(PHP 5 >= 5.1.2, PECL hash:1.1-1.5)
hash_init — Initialize an incremental hashing context
Description
resource hash_init
( string $algo
[, int $options
[, string $key
]] )
Parameters
- 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.
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
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