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function readFileVersions(&$version_info, $directories, $pattern, $recursive = false)
{
	// The comment looks roughly like... that.
	$version_regex = '~\*\s@version\s+(.+)[\s]{2}~i';
	$unknown_version = '??';

	$ext_offset = -strlen($pattern);

	foreach ($directories as $type => $dirname)
	{
		if ($recursive === true)
		{
			$iter = new RecursiveIteratorIterator(
				new RecursiveDirectoryIterator($dirname, RecursiveDirectoryIterator::SKIP_DOTS),
				RecursiveIteratorIterator::CHILD_FIRST,
				RecursiveIteratorIterator::CATCH_GET_CHILD // Ignore "Permission denied"
			);
		}
		else
		{
			$iter = new IteratorIterator(new DirectoryIterator($dirname));
		}

		foreach ($iter as $dir)
		{
			if ($dir->isDir())
			{
				continue;
			}
			$entry = $dir->getFilename();

			if (substr($entry, $ext_offset) == $pattern)
			{
				if ($dir->isWritable() === false)
				{
					continue;
				}
				// Read the first 768 bytes from the file.... enough for the header.
				$header = file_get_contents($dir->getPathname(), false, null, 0, 768);

				if ($recursive === true)
				{
					$entry_key = $dir->getPathname();
				}
				else
				{
					$entry_key = $entry;
				}

				// Look for the version comment in the file header.
				if (preg_match($version_regex, $header, $match) == 1)
					$version_info[$type][$entry_key] = $match[1];
				// It wasn't found, but the file was... show a $unknown_version.
				else
					$version_info[$type][$entry_key] = $unknown_version;
			}
		}
	}
}

			$iter = new IteratorIterator(new DirectoryIterator($dirname));

			$iter = new IteratorIterator(new FilesystemIterator($dirname));