private function filter_get_referr_var( $params ){

		$referer = parse_url( $_SERVER['HTTP_REFERER'] );
		if( !empty( $referer['query'] ) ){
			parse_str( $referer['query'], $get_vars );
			if( isset( $get_vars[$params] ) ){
				return wp_slash( $get_vars[$params] );
			}
		}
		return $params;
	}