Conditional Directory Index In Htaccess

This relates to the question in:

http://stackoverflow.com/questions/1599717/conditional-directoryindex-in-htaccess

The answer states that the following should work:

SetEnvIf Remote_Addr ^127\.0\.0\.0$ owner
<IfDefine owner>
    DirectoryIndex index.html
</IfDefine>
<IfDefine !owner>
    DirectoryIndex index.php
</IfDefine>

I am not sure this works, the setting of the Env var deffinately does, but no matter what IP I visit the site from the DirectoryIndex is always index.php

Is there something wrong with the conditional or should I be using something else?

Thanks in advance

From serverfault icelizard

• I have ended up using the following to achieve what I wanted

  RewriteCond %{REMOTE_ADDR} ^111\.111\.111\.111$
  RewriteRule (.*)/$ $1/index.php
  
  RewriteCond %{REMOTE_ADDR} !^111\.111\.111\.111$
  RewriteRule index.php$ index.html
  

  Thanks!

  From icelizard