yii2文件上传

//模型
<?php
namespace backend\models;
use Yii;
use yii\web\UploadedFile;
class UploalModel extends \yii\db\ActiveRecord
{
    /**
     * @var UploadedFile|Null file attribute
     */
    public $file;
    /**
     * @return array the validation rules.
     */
    public function rules()
    {
        return [
            [["file"], "file",],
        ];
    }
    /**公共上传 上传信息(数组) 文件名称 大小 后缀名限制 上传后保存的名字 update时为更新图片 删除原有图片*/
    public function upload($img,$name = ‘/vessel‘,$siez = ‘‘,$arr_type = ‘‘,$text_name = ‘‘,$act=‘update‘,$url=‘/vessel/20180831/153571385083726.jpg‘)
    {
        $path = ‘../..‘;
        $dirname = $path.$name;
        $fill=$this->file->extension;//图片的名字只取后缀名
        if(empty($text_name)){
            $ran=time().rand(10000,99999);//随机名字
        }else{$ran = $text_name;}
        $arr = $arr_type;
        if(!empty($arr)){
            if(!in_array($fill,$arr)){ return json_encode(‘格式不正确‘);}
        }
        //定义上传大小和类型
        if(!empty($siez)){
            if($img[‘size‘]>$siez) {return json_encode(‘文件大小超过限制‘);}
        }
        //文件上传存放的目录
        $dir=$dirname.‘/‘.date("Ymd");
        $dir_sev=$name.‘/‘.date("Ymd");/*数据库存储路径*/
        if(!file_exists($dir)) {
            mkdir($dir,0777,true);
        }
        if ($this->validate()) {
            //文件名
            $fileName = $ran .‘.‘.$fill;
            $dir = $dir."/". $fileName;
            if($act == ‘update‘){if($this->file->saveAs($dir)){@unlink($path.$url);}}/*删除图片*/
            $uploadSuccessPath = $dir_sev."/". $fileName;/*最后路径*/
            return $uploadSuccessPath;
        }
    }
}

//控制器
<?php
namespace backend\controllers;
use Yii;
use backend\models\UploalModel;
use yii\web\UploadedFile;
class TestController extends \yii\web\Controller
{
    /**
     *    文件上传
     *  我们这里上传成功后把图片的地址进行返回
     */
    public function actionIndex ()
    {
        $model = new UploalModel();
        $uploadSuccessPath = "";
        if (Yii::$app->request->isPost) {
            $model->file = UploadedFile::getInstance($model, "file");
            $file = $model->upload((array)$model->file);
            return $file;
        }
        return $this->render("index", [
            "model" => $model,
            "uploadSuccessPath" => $uploadSuccessPath,
        ]);
    }
}

//视图
<?php
use yii\widgets\ActiveForm;

$form = ActiveForm::begin(["options" => ["enctype" => "multipart/form-data"]]);
?>
    <input type="hidden" name="UploalModel[file]" value="">
    <input type="file" id="uploalmodel-file" name="UploalModel[file]">
    <button>Submit</button>

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