Duplicate page content on / and index.php

[search_shop]

Hi I am new to SEOmoz and in the crawl diagnostics for one of my clients it came back duplicate content on the homepage www.myclient.co.uk and on the www.myclient.co.uk/index.php which is obviously the same page.

I understand that the key is to do a 301 redirect from the index to /, however how will I know that this will not just create an ever ending loop on the server?

From your experience how is the best way to tackle this crawl error? Also is there a specific question that I need to ask the server?

[StreamlineMetrics]

If you are using an Apache server, you should be able to redirect the index.php file to the root by editing the .htaccess file with the following lines -

RewriteCond %{THE_REQUEST} ^./index.php RewriteRule ^(.)index.php$ http://www.mydomain.com/$1 [R=301,L]

If you are using WordPress, there are several plugins available which will allow you to configure this automatically so you don't have to mess with the .htaccess file manually.