CodeIgniter1.7.3 will enable to use QUERY_STRING.

CodeIgniter1.7.3_enable_QUERY_STRING.diff

--- system/libraries/URI.php.org        2011-03-30 21:36:00.730915376 +0800
+++ system/libraries/URI.php    2011-03-30 21:56:32.270865996 +0800
@@ -228,7 +228,9 @@
         */
        function _explode_segments()
        {
-               foreach(explode("/", preg_replace("|/*(.+?)/*$|", "\\1", $this->uri_string)) as $val)
+               //befor parse segments, omit query_string.
+               $uri_string = preg_replace("/\?.*/", '', $this->uri_string);
+               foreach(explode("/", preg_replace("|/*(.+?)/*$|", "\\1", $uri_string)) as $val)
                {
                        // Filter segments for security
                        $val = trim($this->_filter_uri($val));