yii2 model getErrors method to obtain errors

Model gets the wrong way

public static function getModelError($model) {
    
    
$errors = $model->getErrors(); //得到所有的错误信息
if(!is_array($errors)) return '';
$firstError = array_shift($errors);
if(!is_array($firstError)) return '';
return array_shift($firstError);
}

getErrors () ：

Return all attributes or errors of a single attribute, that is, return all errors that occurred in the verification.

$model = new User();

$model->name = $name;

$model->nick_name = $nick_name;

$model->phone = $phone;

$model->sex = $sex;

$model->isNewRecord = true; //此语句可省略

if(!$model->save()){
    
     //保存不成功


throw new \RuntimeException('保存败.'.$model::getModelError($model));

}

getErrors ()

Array
(
    [cid] => Array
        (
            [0] => Cid不能为空=> Array
        (
            [0] => Times不能为空

$model->getFirstErrors()

Returns the first error message for each attribute. The return is as follows:

Array
(
    [cid] => Cid不能为空=> Times不能为空

$model->getFirstError('cid'); The return is as follows:
Cid cannot be empty.