I'm having a problem with a closure within my controller. In my view, I have a link to the controller like this

<a href="/accounts/balance"></a>

The "balance" part is an optional parameter in my router:

Route::get('accounts/{sort?}', 'AccountController@getAccounts');

I know that the parameter is getting to my controller, because I can pass it back with ->with('sort', $sort). Also, my if statement is entered, because I'm getting the error "undefined variable $sort".

I am using the sort to sort my array before rendering the array values in a table (which works directly in a the view).

However, within the array_sort closure, my variable is no longer recognized. I have tried it as $sort, $this->sort, self::$sort. My scope is all out of scope!

Here is my controller. I would appreciate help with this, or I'm always up for a better way of doing what I'm trying to do (but this seemed pretty straightforward).

public function getAccounts($sort = null) {

        $accounts = Account::all();

        if ($sort) {
            $accounts = array_values(array_sort($accounts, function ($value) {
                        return $value[$sort];
                    }));
        }
        return View::make('account.accounts')
                        ->with('accounts', $accounts)
                        ->with('sort', $sort);
    }