在Yii2框架中为已有的模型对象动态添加新属性

namespace app\models;

use yii\base\BaseObject;
use yii\base\Arrayable;

class DynamicAttribute extends BaseObject implements Arrayable
{
    public $name;
    public $value;

    public function fields()
    {
        return [
            'name',
            'value',
        ];
    }
}

namespace app\models;

use yii\base\DynamicModel;

class User extends \yii\db\ActiveRecord
{
    public $dynamicAttributes;

    public function rules()
    {
        return [
            [['dynamicAttributes'], 'safe'],
        ];
    }

    public function afterFind()
    {
        parent::afterFind();

        $dynamicAttributes = [];
        foreach ($this->dynamicAttributes as $attribute) {
            $dynamicAttribute = new DynamicAttribute();
            $dynamicAttribute->name = $attribute['name'];
            $dynamicAttribute->value = $attribute['value'];
            $dynamicAttributes[] = $dynamicAttribute;
        }

        $this->dynamicAttributes = $dynamicAttributes;
    }
}

namespace app\controllers;

use Yii;
use app\models\User;

class UserController extends \yii\web\Controller
{
    public function actionIndex()
    {
        $user = User::findOne(1);

        $dynamicAttributes = [
            ['name' => 'age', 'value' => 25],
            ['name' => 'gender', 'value' => 'male'],
        ];

        $user->dynamicAttributes = $dynamicAttributes;

        return $this->render('index', [
            'user' => $user,
        ]);
    }
}

foreach ($user->dynamicAttributes as $dynamicAttribute) {
    echo $dynamicAttribute->name . ': ' . $dynamicAttribute->value . '<br>';
}