1、单个文件上传
首先建立一个模型models/UploadForm.php,内容如下
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namespace app\models;
use yii\base\Model;
use yii\web\UploadedFile;
/**
* UploadForm is the model behind the upload form.
*/
class UploadForm extends Model
{
/**
* @var UploadedFile file ...
