Category:Core -> GET
If you want to enable $_GET in your CI app, check out this thread
For enabling it site-wide look here
Briefly, it depends on if you want it site wide or for a few pages.
If you only need it in a few pages:
1) Set your config item ‘uri_protocol’ to ‘PATH_INFO’.
$config['uri_protocol'] = "PATH_INFO";
2) Use this line to rebuild the $_GET array (in your controller)
parse_str($_SERVER['QUERY_STRING'],$_GET);