相关复选框的Laravel验证规则

在我的表单中，我有两个复选框，我希望在提交表单之前至少选中其中一个（或两个）。我的输入复选框命名为

car

和

bike

。在我的控制器中，我正在验证我的请求

$this->validate($request, [
            'content'=> 'required',
            'title' => 'required',
            'car | bike' => 'required', //this is not correct.
        ]);

我无法理解的是允许我进行上述验证的语句

return Validator::make($request, [
        'firstName' => 'required|max:255',
        'lastName' => 'required|max:255',
        'email' => 'required|email|max:255|unique:users',
        'password' => 'required|confirmed|min:6',
        'checkbox' =>'required_without_all',
    ]);

或

 return Validator::make($request, [
        'firstName' => 'required|max:255',
        'lastName' => 'required|max:255',
        'email' => 'required|email|max:255|unique:users',
        'password' => 'required|confirmed|min:6',
        'option' =>'accepted'
    ]);

Validator::make( 
        [ 'cats' => Input::get('cats') ],
        [ 'cats' => 'min:1' ]
    );

或

 return Validator::make($request, [
        'firstName' => 'required|max:255',
        'lastName' => 'required|max:255',
        'email' => 'required|email|max:255|unique:users',
        'password' => 'required|confirmed|min:6',
        'option' =>'accepted'
    ]);

Validator::make( 
        [ 'cats' => Input::get('cats') ],
        [ 'cats' => 'min:1' ]
    );

示例：

$validator = Validator::make([
    'cats' => ['Boots', 'Mittens', 'Snowball']
    ], ['cats' => 'min: 1']);

$result = $validator->fails(); // returns false

$validator = Validator::make([
    'cats' => ['Boots', 'Mittens', 'Snowball']
    ], ['cats' => 'min: 2']);

$result = $validator->fails(); // returns false

$validator = Validator::make([
    'cats' => ['Boots', 'Mittens', 'Snowball']
    ], ['cats' => 'min: 4']);

$result = $validator->fails(); // returns true

或

 return Validator::make($request, [
        'firstName' => 'required|max:255',
        'lastName' => 'required|max:255',
        'email' => 'required|email|max:255|unique:users',
        'password' => 'required|confirmed|min:6',
        'option' =>'accepted'
    ]);

Validator::make( 
        [ 'cats' => Input::get('cats') ],
        [ 'cats' => 'min:1' ]
    );

参考：