composer require aliyuncs/oss-sdk-php

<?php
namespace app\components;

use Yii;
use yii\base\Component;
use OSS\OssClient;

class Aliyunoss extends Component
{
  public static $oss;

  public function __construct()
  {
    parent::__construct();
    $accessKeyId = Yii::$app->params['oss']['accessKeyId'];         //获取阿里云oss的accessKeyId
    $accessKeySecret = Yii::$app->params['oss']['accessKeySecret'];     //获取阿里云oss的accessKeySecret
    $endpoint = Yii::$app->params['oss']['endPoint'];            //获取阿里云oss的endPoint
    self::$oss = new OssClient($accessKeyId, $accessKeySecret, $endpoint); //实例化OssClient对象
  }

  /**
   * 使用阿里云oss上传文件
   * @param $object  保存到阿里云oss的文件名
   * @param $filepath 文件在本地的绝对路径
   * @return bool   上传是否成功
   */
  public function upload($object, $filepath)
  {
    $res = false;
    $bucket = Yii::$app->params['oss']['bucket'];        //获取阿里云oss的bucket
    if (self::$oss->uploadFile($bucket, $object, $filepath)) { //调用uploadFile方法把服务器文件上传到阿里云oss
      $res = true;
    }

    return $res;
  }

  /**
   * 删除指定文件
   * @param $object 被删除的文件名
   * @return bool  删除是否成功
   */
  public function delete($object)
  {
    $res = false;
    $bucket = Yii::$app->params['oss']['bucket'];  //获取阿里云oss的bucket
    if (self::$oss->deleteObject($bucket, $object)){ //调用deleteObject方法把服务器文件上传到阿里云oss
      $res = true;
    }

    return $res;
  }

  public function test(){
    echo 123;
    echo "success";
  }
}
?>

'oss' =>[
    'accessKeyId'=>'您的accessKeyId',
    'accessKeySecret'=>'您的accessKeySecret',
    'bucket' => '您的bucket',
    'endPoint' => '您的endPoint',
  ]

'Aliyunoss' => [
  'class' => 'app\components\Aliyunoss',
],

Yii::$app->Aliyunoss->test();