Yii2 动态设置验证规则

$model = new \yii\base\DynamicModel(['username', 'sex']);
$model->addRule(['username', 'sex'], 'required');
$model->addRule('username', 'string', ['min' => 4]);
 
$model->load(['username' => 'xy'], '');
$model->validate();
 
var_dump($model->errors);