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hash_update_file	Mcrypt

Hash Functions	Last updated: Mon, 26 Oct 2026

hash_update_stream

(PHP 5 >= 5.1.2, PHP 7, PHP 8, PECL hash >= 1.1)

hash_update_stream — Pump data into an active hashing context from an open stream

Description

function hash_update_stream(HashContext $context, resource $stream, int $length = -1): int

Parameters

context: Hashing context returned by hash_init().
stream: Open file handle as returned by any stream creation function.
length: Maximum number of characters to copy from stream into the hashing context.

Return Values

Actual number of bytes added to the hashing context from stream.

Changelog

Version	Description
7.2.0	Accept HashContext instead of resource.

Examples

Example #1 hash_update_stream() example

<?php
$fp = tmpfile();
fwrite($fp, 'jumped over the lazy dog.');
rewind($fp);

$ctx = hash_init('sha256');
hash_update($ctx, 'The quick brown fox ');
hash_update_stream($ctx, $fp);
echo hash_final($ctx);
?>

The above example will output:

68b1282b91de2c054c36629cb8dd447f12f096d3e3c587978dc2248444633483

See Also

hash_init() - Initialize an incremental hashing context
hash_update() - Pump data into an active hashing context
hash_final() - Finalize an incremental hash and return resulting digest

hash_update_file	Mcrypt

Hash Functions	Last updated: Mon, 26 Oct 2026