How to validate two dimensional array in Yii2

Probably the most clean solution for validating 2-dimensional array is treating this as array of models. So each array with set of email and name data should be validated separately.

class Passenger extends ActiveRecord {

    public function rules() {
        return [
            [['email', 'name'], 'required'],
            [['email'], 'email'],
        ];
    }
}

class PassengersForm extends Model {

    /**
     * @var Passenger[]
     */
    private $passengersModels = [];

    public function loadPassengersData($passengersData) {
        $this->passengersModels = [];
        foreach ($passengersData as $passengerData) {
            $model = new Passenger();
            $model->setAttributes($passengerData);
            $this->passengersModels[] = $model;
        }

        return !empty($this->passengers);
    }

    public function validatePassengers() {
        foreach ($this->passengersModels as $passenger) {
            if (!$passenger->validate()) {
                $this->addErrors($passenger->getErrors());
                return false;
            }
        }

        return true;
    }
}

And in controller:

$model = new PassengersForm();
$model->loadPassengersData(\Yii::$app->request->post('passenger', []));
$isValid = $model->validatePassengers();

You may also use DynamicModel instead of creating Passanger model if you're using it only for validation.

Alternatively you could just create your own validator and use it for each element of array:

public function rules() {
    return [
        [['passengers'], 'each', 'rule' => [PassengerDataValidator::class]],
    ];
}

You may also want to read Collecting tabular input section in guide (unfortunately it is still incomplete).