Simulation of md5 hash of files in linux; helps to find out any files modified after you gave them to someone else. Calculates md5 hash of files under directory.

md5_dir.php

<?php
function md5_dir($path='/tmp')
{
	global $counter;
	global $skip_directories;
	global $skip_extensions;
	$handle = opendir($path);
	while(false!==($file=readdir($handle)))
	{
		if(in_array($file, $skip_directories)) continue;
		
		$full_path = $path.'/'.$file;
		if(is_dir($full_path))
		{
			md5_dir($full_path);
		}
		else
		{
			$pathinfo = pathinfo($full_path);
			#if(empty($pathinfo['extension'])) die('Sorry: '.$full_path);
			if(empty($pathinfo['extension'])) continue;
			if(in_array($pathinfo['extension'], $skip_extensions)) continue;

			$data = array(
				'count' => ++$counter,
				'hash' => md5_file($full_path),
				'date' => date('Y-m-d H:i:s', filemtime($full_path)),
				'size' => number_format(filesize($full_path)),
				'name' => str_replace(__ROOT__, '', $full_path),
			);
			echo implode("\t", $data), "\r\n";
			#echo md5_file($full_path), "\t", $full_path, "\r\n";
		} # if
	} # while
}

header('Content-Type: text/plain');
$counter = 0;
$path = '/home/USER/public_html';
define('__ROOT__', $path);
$skip_directories = array('.', '..', '.svn', 'tmp', 'out');
$skip_extensions = array(
	'txt',
	'css',
	'js',
	'gif',
	'jpg',
	'png',
	'JPG',
	'jpeg',
	'psd',
	# 'php',
	'md',
	'ttf',
	'xml',
	'ico',
	'htc',
	'svg',
	'map',
	'htm',
	'html',
	'inc',
	'properties',
	'htaccess',
);
md5_dir($path);
?>