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hash_init

(no version information, might be only in CVS)

hash_init -- Initialize an incremental hashing context

Description

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

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.

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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