hash_update_stream
Description
The hash_update_stream of Hash for PHP pump data into an active hashing context from an open stream.
Syntax
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
Actual number of bytes added to the hashing context from stream.
Examples
1 · context stream
<?
$context = hash_init('sha384');
$stream = tmpfile();
fwrite($stream, 'Hello');
rewind($stream);
hash_update_stream($context, $stream);
echo hash_final($context);
?>3519fe5ad2c596efe3e276a6f351b8fc0b03db861782490d45f7598ebd0ab5fd5520ed102f38c4a5ec834e98668035fc
2 · length
<?
$context = hash_init('sha384');
$stream = tmpfile();
fwrite($stream, 'Hello');
rewind($stream);
$length = 2;
hash_update_stream($context, $stream, $length);
echo hash_final($context);
?>ef79aa83fbc20dd717eef1e985c5b3c7f2fdbe8351665f2ac47b5c4b01950d67936f53eaf1e574ae6bf125a653481bb7
3 · Return
<?
$context = hash_init('sha384');
$stream = tmpfile();
fwrite($stream, 'Hello');
rewind($stream);
$return = hash_update_stream($context, $stream);
hash_final($context);
var_export($return);
?>5
