php - Laravel validator for nested array

Am using the Laravel Validator class to do some basic validation on an array.

My array :

$employee['name']='name';
$employee['address']='address';
$employee['department']['name']='deptname';
$employee['department']['address']='deptaddress';
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I have the validation rules as below:

$rules = array(
    'name'=> 'required',
    'address' => 'required'
)
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And the custom messages as below :

$messages = array(
     'name.required' => 'Employee Name is required',
     'address.required' => 'Address is required'
)
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I will useValidator::make($employee, $rules, $messages);

How do I write the rule and messages for$employee[department]['name'] and$employee[department]['address'] using same rules and messages variables?