Note: This software is no longer maintained. It should do what it is supposed to do. Feel free to fork and improve on it.
A simple stream filter to calculate the MD5 hash of a PHP stream. Attach the
filter to the stream, process the stream, and when you're done, call
md5s_get_hash() to fetch the hash.
This code is licensed under the New BSD license. It was forked from code in the [SambaDAV repository] (https://github.com/1afa/sambadav/blob/master/src/include/streamfilter.md5.php), where it was licensed under the GNU Affero GPL version 3.
<?php
require_once 'streamfilter.md5.php';
// Setup code, acquire a stream in $fd:
$fd = fopen('test.txt', 'r');
// Register stream filter, append to filter chain:
stream_filter_register('md5sum', 'md5sum_filter');
$md5_filter = stream_filter_append($fd, 'md5sum');
// Dummy file read, just to get the data flowing;
// in reality this might be a stream_copy_to_stream() invocation:
while (fread($fd, 5000000));
// Remove filter, close handle, print hash:
stream_filter_remove($md5_filter);
fclose($fd);
printf("MD5: %s\n", md5s_get_hash());