php - yii2视图传递参数显示失败

Question

controllers：

<?php

namespace app\controllers;

use Yii;
use yii\helpers\Json;
use yii\web\Controller;
use app\models\Folder;

class HomeController extends Controller
{
    public $model;
    public function init()
    {
        parent::init();
        $this->model = new Folder();


    }

    public function actionIndex()
    {
        $view = Yii::$app->view;  
        $view->params['new'] = $this->model;

        $folders = $this->model ->search();

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

    }
}

model:

<?php

namespace app\models;

use Yii;


class Folder extends \yii\db\ActiveRecord
{
    /**
     * @inheritdoc
     */
    public $fname;
    public $type;
    public $pid;

    public static function tableName()
    {
        return 'folder';
    }


    public function search($param=null)
    {
        $condition = $param == null ? ['pid' => 0, 'type' => 0] : ['pid' => $param];
        $query = Folder::find();
        $folders = $query->where($condition)->all();
        return $folders;
    }
}

view:

<?php

/* @var $this yii\web\View */
use yii\helpers\Html;
use yii\bootstrap\ActiveForm;
use yii\bootstrap\Modal;
use app\assets\AppAsset;

AppAsset::register($this);

$this->title = 'CodeNote';
?>
    <p class="left-container col-lg-2">
        <p class="folder">
                <?php foreach ($folders as $folder): ?>
                    <p id=<?= Html::encode("{$folder->id} ") ?> type=<?= Html::encode("{$folder->type} ") ?> >
                        <?= Html::encode("{$folder->fname} ") ?>
                    </p>
                <?php endforeach; ?>
        </p>
    </p>

    <p class="right-container col-lg-10">

    </p>
    <?php

        Modal::begin([
            'header' => '<h2>新建</h2>',
            'id' => 'new-modal'
        ]);?>

        <?php $form = ActiveForm::begin([    
            'id' => 'folder',
            'enableAjaxValidation'=>false,   
            'enableClientValidation'=>true, 
            'action' => ['/home/new'],
            'layout' => 'horizontal',
            'fieldConfig' => [
                'template' => "{label}\n<p class=\"col-lg-6\">{input}</p>\n<p class=\"col-lg-offset-4 col-lg-6\">{error}</p>",
                'labelOptions' => ['class' => 'col-lg-4 control-label '],
            ],
        ]); ?> 

                <?= $form->field($this->params['new'], 'fname', ['labelOptions' => ['label' => '名字']])->textInput(['autofocus' => true]) ?>
                <?= $form->field($this->params['new'], 'type')->textInput()->hiddenInput(['value'=>'0'])->label(false); ?>
                <?= $form->field($this->params['new'], 'pid')->textInput()->hiddenInput(['value'=>'0'])->label(false); ?>

                <p class="form-group">
                <p class="col-lg-offset-4 col-lg-4">
                    <?= Html::submitButton('确定', ['class' => 'btn btn-primary', 'name' => 'new-button']) ?>
                </p>
            </p>
            <?php ActiveForm::end(); ?>

    <?php Modal::end();    ?>

<?php

?>

数据库含有fname,type,pid,id字段，当运行上面程序时无法显示内容。但将model的变量$fname和ActiveForm的fname换成别的名字就能显示了。为什么这两个不能够同名呢？？