<?php
$oldDirectory = "./test1/"; //this is the ORIGINAL stuff
$newDirectory = "./test2/"; //this is the NEW stuff

foreach (glob($newDirectory . "*.*") as $filename) {
	$localFile = str_replace($filename, $newDirectory, "");
	$newHash = sha256(file_get_contents($filename));
	echo $localFile . ": " . $newHash;
	if (file_exists($oldDirectory . $localFile)) {
		echo " found locally ";
		$oldHash = sha256(file_get_contents($oldDirectory . $localFile));
		if ($newHash !== $oldHash) {
			echo " mismatch!";
			//uncomment the next line to auto replace (maybe?)
			//file_put_contents($oldDirectory . $localFile, file_get_contents($filename));
		}
		echo PHP_EOL;
	}
}