1、SDK安装方法参考：https://github.com/aliyun/aliyun-oss-php-sdk/blob/master/README-CN.md

2、上代码【我是写在了 common.php 中】

//文件上传到oss
function fileUpload($file){

    foreach ($file as $v){
        $info = $v->move( './uploads','');

        if($info){
            $oss = config('oss.');
            $accessKeyId = $oss['accessKeyId'];
            $accessKeySecret = $oss['accessKeySecret'];
            $endpoint = $oss['endpoint'];
            $bucket= $oss['bucket'];
            include_once('/aliyuncs/oss-sdk-php/autoload.php');
            //include_once('aliyuncs/oss-sdk-php/autoload.php SDK自动加载文件的路径');
            $ossClient = new \OSS\OssClient($accessKeyId, $accessKeySecret, $endpoint);
            $filepath = './uploads/'.$info->getsaveName();
            $md5 = md5_file($filepath);
            //以上不用动
            $result = $ossClient->uploadFile($bucket, $info->getFilename(), $filepath);
            $fileId = \think\Db::name('file')->where('md5',$md5)->value('id');
            if($fileId){
                $data[] = $fileId;
            }else{
                $data[] = \think\Db::name('file')->insertGetId(['url'=>$result['info']['url'],'md5'=>$md5,'file_name'=>$info->getFilename()]);
            }

        }
    }
//    unlink($filepath);
    return $data;
}

2、Conf目录中的oss.php内容例如：

// +----------------------------------------------------------------------
// | OSS相关设置
// +----------------------------------------------------------------------

return [
    // accessKeyId
    'accessKeyId' => '********',
    // accessKeySecret
    'accessKeySecret' => '********',
    // endpoint
    'endpoint' => 'http://oss-cn-********.aliyuncs.com',
    // bucket
    'bucket' => '********',
];