Yii2使用自带的UploadedFile实现的文件上传

<?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",],
];
}
}

<?php
use yii\widgets\activeform;
$form = activeform::begin(["options" => ["enctype" => "multipart/form-data"]]); ?>
<?= $form->field($model, "file")->fileinput() ?>
<button>submit</button>
<?php activeform::end(); ?>

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,
]);
}
}