Concrete5 development redirect based on IP. Useful if you want to redirect site visitors while in development - while allowing clients etc to review without registering or logging in. Just edit your root index.php file

index.php

<?php $allow = array("91.91.91.91", "92.92.92.92"); # Add allowed IP address

if(!in_array($_SERVER['REMOTE_ADDR'], $allow) && !in_array($_SERVER["HTTP_X_FORWARDED_FOR"], $allow)) {

  header("Location: http://www.domain.com/whereveryouwant/index.html"); # your redirection url

	exit();

} ?>
<?php 
require('concrete/dispatcher.php');  # allowed ip addresses will just see the site as normal