Try this way
$current_uri = $_SERVER['REQUEST_URI']
// $current_uri = http://text.com/text/index.php?route=common/response&DR=5Uijhnk+t1j3lFFFEf4RB3zYyX
$parsed_url = parse_url($current_uri);
print_r($parsed_url);
/* Array
(
[scheme] => http
[host] => text.com
[path] => /text/index.php
[query] => route=common/response&DR=5Uijhnk+t1j3lFFFEf4RB3zYyX
) */
$query = array();
parse_str($parsed_url['query'], $query); // parse url string
print_r($query);
/* Array
(
[route] => common/response
[DR] => 5Uijhnk+t1j3lFFFEf4RB3zYyX
) */