PHP hash_init: Initialize Incremental Hashing Context
The article explains PHP's hash_init function, detailing its purpose to initialize an incremental hashing context, describing its parameters (algorithm name, options, key), return value, and provides a complete example demonstrating how to compute an MD5 hash using hash_update and hash_final.
The hash_init function in PHP creates an incremental hashing context, allowing you to feed data in chunks and compute a final hash value.
Syntax:
resource hash_init(string $algo [, int $options = 0 [, string $key = NULL ]])Parameters
algo : The name of the hash algorithm to use, e.g., "md5", "sha256", "haval160,4". Use hash_algos() to retrieve the list of supported algorithms.
options : Optional settings for the hash operation; currently only HASH_HMAC is supported. When this option is set, the key parameter must also be provided.
key : The shared secret key used when options is HASH_HMAC, enabling HMAC hashing.
Return value
Returns a hash context resource that can be used with hash_update() and hash_final().
Example
The following PHP code demonstrates initializing an MD5 hash context, updating it with two strings, and obtaining the final hash:
<?php
$ctx = hash_init('md5');
hash_update($ctx, 'The quick brown fox ');
hash_update($ctx, 'jumped over the lazy dog.');
echo hash_final($ctx);
?>Output
5c6ffbdd40d9556b73a21e63c3e0e904Signed-in readers can open the original source through BestHub's protected redirect.
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