PHP Variable scope issue laravel

Question

public function action_detail($orderId)
{
    $customerWithOrderDetails = Customer::with(array('order' => function($query)
    {   global $orderId;
        $query->where('id', '=', $orderId);
    }, 'order.orderdetail', 'order.attachment'))->find(Auth::user()->id);
    return var_dump($customerWithOrderDetails);
}

I am getting "variable undefined" error. Why?

Answer 1

$orderId is not a global variable, but a variable of a parent function. Try this:

function($query) use ($orderId)
    {
        $query->where('id', '=', $orderId);
    }

instead of:

function($query)
    {   global $orderId;
        $query->where('id', '=', $orderId);
    }