mgc.longyilive.com/models/UploadImg.php

<?php
namespace app\models;

use Yii;
use yii\base\Model;
use yii\web\UploadedFile;
use yii\helpers\FileHelper;

class UploadImg extends Model
{
    public $file;
    private $_appendRules;


    public function init ()
    {
        parent::init();
        $extensions = Yii::$app->params['webuploader']['baseConfig']['accept']['extensions'];
        $this->_appendRules = [
            [['file'], 'file', 'extensions' => $extensions],
        ];
    }

  
    public function rules()
    {
        $baseRules = [];
        return array_merge($baseRules, $this->_appendRules);
    }
    
    
    public function upload()
    {   
       
        // $relativePath = $successPath = '';
        if ($this->validate()) {
            $relativePath = './uploads/images/';
            $successPath = '/uploads/images/';
            $fileName = time().rand(1,100) . '.' . $this->file->extension;
            if (!is_dir($relativePath)) {
                FileHelper::createDirectory($relativePath);
            }
            $this->file->saveAs($relativePath . $fileName);
            return [
                'code' => 0,
                'url' => Yii::$app->params['domain'] . $successPath . $fileName,
                'attachment' => $successPath . $fileName
            ];
        } else {
            $errors = $this->errors;
            return [
                'code' => 1,
                'msg' => current($errors)[0]
            ];
        }

    }

}