PHP hash_update_stream() Function

The PHP hash_update_stream() function is used to pump data into an active hashing context from an open stream.

Syntax

hash_update_stream(context, stream, length)

Parameters

`context`	`Required.` Specify hashing context returned by hash_init().
`stream`	`Required.` Specify an open file handle as returned by any stream creation function.
`length`	`Optional.` Specify the maximum number of characters to copy from stream into the hashing context.

Return Value

Returns the actual number of bytes added to the hashing context from stream.

Example: hash_update_stream() example

The example below shows the usage of hash_update_stream() function.

<?php
//creating a temporary file
$fp = tmpfile();

//write some content to it
fwrite($fp, 'Hello World!');

//setting the file pointer to the start
rewind($fp);

//initializing an incremental hashing context
$ctx = hash_init('md5');

//updating context
hash_update_stream($ctx, $fp);

//finalizing an incremental hash
//and returning resulting digest
echo hash_final($ctx);

//closing the file
fclose($fp);
?>

The output of the above code will be:

ed076287532e86365e841e92bfc50d8c

❮ PHP Hash Reference