Self-healing index.php???

/*This code should be triggered by an event like OnWebPagePrerender*/

		$refvalues = array();
		$checksums = array();

		$refvalues['.htaccess'] = 'SOME_ACTUAL_MD5_VALUE_CALCULATED_AHEAD_OF_TIME';
		$checksums['.htaccess'] = md5_file('.htaccess');
		
		$refvalues['index.php'] = 'SOME_ACTUAL_MD5_VALUE_CALCULATED_AHEAD_OF_TIME';
		$checksums['index.php'] = md5_file('index.php');
		
		$refvalues['manager/.htaccess'] = 'SOME_ACTUAL_MD5_VALUE_CALCULATED_AHEAD_OF_TIME';
		$checksums['manager/.htaccess'] = md5_file('manager/.htaccess');
		
		$refvalues['assets/.htaccess'] = 'SOME_ACTUAL_MD5_VALUE_CALCULATED_AHEAD_OF_TIME';
		$checksums['assets/.htaccess'] = md5_file('assets/.htaccess');
		
		$refvalues['manager/includes/protect.inc.php'] = 'SOME_ACTUAL_MD5_VALUE_CALCULATED_AHEAD_OF_TIME';
		$checksums['manager/includes/protect.inc.php'] = md5_file('manager/includes/protect.inc.php');
		
		$refvalues['manager/includes/config.inc.php'] = 'SOME_ACTUAL_MD5_VALUE_CALCULATED_AHEAD_OF_TIME';
		$checksums['manager/includes/config.inc.php'] = md5_file('manager/includes/config.inc.php');
		
		$refvalues['manager/includes/document.parser.class.inc.php'] = 'SOME_ACTUAL_MD5_VALUE_CALCULATED_AHEAD_OF_TIME';
		$checksums['manager/includes/document.parser.class.inc.php'] = md5_file('manager/includes/document.parser.class.inc.php');

		$backupneeded = FALSE;

		foreach($refvalues as $key => $value)
		{
			if ($checksums[$key] != $value)
				$backupneeded = TRUE;
		}

		if ($backupneeded === TRUE)
		{
            $emailmsg = 'Backup needed : '.$backupneeded;
			$backupsucceeded = TRUE;
			foreach($refvalues as $key => $value)
			{
                    $emailmsg .= 'File : '.$key.'<br/>';
					$chngdfile = chmod($key, 0755);
                    $emailmsg .= '  Made writeable : '.$chngdfile.'<br/>';
					if ($chngdfile === TRUE)
                        {
						 /*PATHTOYOURBACKUPS is something like /home1/youraccount/somefolder/somesubfolder/somesubsubfolder/*/
					     $backuprestored = copy('PATHTOYOURBACKUPS'.$key, $key);
				         if ($key == 'manager/includes/config.inc.php')
                                $chngdfile = chmod($key, 0600);
                         else
                                $chngdfile = chmod($key, 0644);
                         $emailmsg .= '  Made readonly : '.$chngdfile.'<br/>';
					     if ($backuprestored !== TRUE)
						     $backupsucceeded = FALSE;
                         $emailmsg .= '  Backup succeeded : '.$backupsucceeded;
                        }
                    else
                    {
                         $emailmsg .= '  Not able to make file writeable<br/>';
                    }
                    $emailmsg .= 'Backup succeeded = '.$backupsucceeded.'<br/>';
			}

			$emailaddy = 'YOUREMAIL@ADDRESS';
			if ($backupsucceeded === TRUE)
			{
				$emailsubject .= MODX_SITE_URL.' Backup was needed ...';
				mail($emailaddy, $emailsubject, $emailmsg);	
				header('Location: .');
			}
			else
			{
				$emailsubject = MODX_SITE_URL.' Backup was needed but FAILED ...';
				$emailmsg = 'Backup plugin was triggered for '.MODX_SITE_URL.' but FAILED on file copy.';	
				mail($emailaddy, $emailsubject, $emailmsg);	
			}
        }