$_GET[“sigid”] is default value.

I want to default filter for select column. My code is;

$col = array();
$col[“title”] = fnp_chef_lang(‘Belge No’);
$col[“name”] = “stock_in_group_id”;
$col[“dbname”] = “sig.id”;
$col[“width”] = “50”;
$col[“show”][“list”] = true;
$col[“show”][“view”] = true;
$col[“editable”] = true;
$col[“search”] = true;
$col[“edittype”] = “lookup”;
$col[“editoptions”] = array(“table”=>”stock_in_group”, “id”=>”id”, “label”=>”invoice_number”);
$col[“searchoptions”] = array(“defaultValue”=>$_GET[“sigid”]);

$cols[] = $col;