Yii2文件上传

1.创建Model类 UploadForm.php


<?php 
namespace app\models;


use yii\base\Model;


class UploadForm extends Model
{


    public $imageFile;


    //制定规则
    public function rules()
    {
        return [
            [['imageFile'], 'file', 'skipOnEmpty' => false, 'extensions' => 'png, jpg'],
        ];
    }
    
    //上传
   public function upload()
    {
        $imgName=substr(time(),4).rand(111,999);
        $this->imageFile->saveAs('uploads/' . $imgName . '.' . $this->imageFile->extension);
        return 'uploads/'.$imgName. '.'.$this->imageFile->extension;
    }
}


2.在web目录下创建uploads文件夹


3.创建控制器 
<?php 
namespace app\controllers;


use Yii;
use yii\web\Controller;
use app\models\UploadForm;
use yii\web\UploadedFile;


class IndexController extends Controller{


//上传方法
public function actionUpload()
{
//实例化上传model类
$model = new UploadForm();

if(Yii::$app->request->isPost){
//取出model中的图片信息
$model->imageFile = UploadedFile::getInstance($model,'imageFile');


if($model->upload()){
//上传成功添加入库
$img = $model->imageFile->name;


//添加入库
$res = Yii::$app->db->createCommand()->insert('photo',['img'=>$img])->execute();

//判断是否上传成功
if($res){
return $this->redirect(['list']);
}
return $this->goBack();
}
}


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


4.视图
<?php
use yii\widgets\ActiveForm;
?>
<h2>上传图片</h2>
<?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]) ?>


    <?= $form->field($model, 'imageFile')->fileInput(['class'=>'btn'])->label("上传") ?>


    <button class="btn">上传</button>


<?php ActiveForm::end() ?>