Send search keywords to QMT string

Starting point:
I’ve the home page with the wp default searchform and QMT lists on the sidebar.
My goal is that: when i type a keyword inside the searchform and i hit search, the result of the search will affect also the QMT lists on the sidebar when i get the results page.

What i achieved till now:
On the search.php page, where the results of the search query are displayed, i’ve created a variable “$string_to_qmt” that contains as value a string builded in the right way for QMT:

?taxonomy=term+term+term&taxonomy=term+term+term&taxonomy=term"

I’ve created a link with this variable, showed together with the result page permalink on the search.php page.
Clicking on this link, gives me the same results in the same way if I clicked several times on the QMT lists terms.
So the link it’s working.

Now, to automate this behaviour, i need to send this variable “$string_to_qmt” to QMT core that i modified in this way inside the class QMT_hooks:

function request( $request ) {

		/* mods */
		if ( isset( $_GET['s'] ) ) {
			echo "Searched term: " .$_GET['s'];
			$sgaRequest = $string_to_qmt;
		} else {
			if ( !isset( $_GET['qmt'] ) ) {
				return $request;
			} else {
				$sgaRequest = $_GET['qmt'];
			}
		}
		echo "sgaRequest: " .$sgaRequest;
		/* mods */

		foreach ( $sgaRequest as $taxonomy => $terms ) {
			$request['tax_query'][] = array(
				'taxonomy' => $taxonomy,
				'terms' => $terms,
				'field' => 'term_id',
				'operator' => 'IN',
			);
		}

		return $request;
	}

This do the following check:
if i set $_GET[‘s’] (this means that i did a search using the searchform) get the $string_to_qmt variable that contains the preformatted QMT string.

What i can’t achieve is to send the $string_to_qmt variable, defined into the search.php page, to the core QMT_hooks class.

I’ve tried also to define it as global $string_to_qmt, but without success.
How i can solve this?

http://wordpress.org/extend/plugins/query-multiple-taxonomies/