Yii2 uses its own UploadedFile to implement file upload

Let’s first take a look at how to process image uploads supported in yii2.

First we create the modelUpload.php file

<&#63;php
namespace backend\models;
use Yii;
use yii\web\UploadedFile;
class Upload extends \yii\db\ActiveRecord
{
/**
* @var UploadedFile|Null file attribute
*/
public $file;
/**
* @return array the validation rules.
*/
public function rules()
{
return [
[["file"], "file",],
];
}
}

Next we look at how the view layer is rendered

<&#63;php
use yii\widgets\ActiveForm;
$form = ActiveForm::begin(["options" => ["enctype" => "multipart/form-data"]]); ?>
<&#63;= $form->field($model, "file")->fileInput() ?>
<button>Submit</button>
<&#63;php ActiveForm::end(); &#63;>

Finally, we implement the controller layer

namespace backend\controllers;
use backend\models\Upload;
use yii\web\UploadedFile;
class ToolsController 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 actionUpload ()
{
$model = new Upload();
$uploadSuccessPath = "";
if (Yii::$app->request->isPost) {
$model->file = UploadedFile::getInstance($model, "file");
//文件上传存放的目录
$dir = "../../public/uploads/".date("Ymd");
if (!is_dir($dir))
mkdir($dir);
if ($model->validate()) {
//文件名
$fileName = date("HiiHsHis").$model->file->baseName . "." . $model->file->extension;
$dir = $dir."/". $fileName;
$model->file->saveAs($dir);
$uploadSuccessPath = "/uploads/".date("Ymd")."/".$fileName;
}
}
return $this->render("upload", [
"model" => $model,
"uploadSuccessPath" => $uploadSuccessPath,
]);
}
}

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The above introduces the file upload implemented by Yii2 using its own UploadedFile, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.