使用 cakephp 3 上传 AWS S3 文件

要创建S3客户端，它的原因是该方法以外的目的$s3在方法null。

您需要在方法本身中创建对象，或者您可以将 S3 客户端对象存储在类属性中并与 $this->s3->putObject()

更好的是创建一个组件，如下所示：

<?php
 namespace App\Controller\Component;
 use Cake\Controller\Component;
 use Aws\S3\S3Client;

 class AmazonComponent extends Component{
    public $config = null;
    public $s3 = null;

    public function initialize(array $config){
        parent::initialize($config);
        $this->config = [
           's3' => [
               'key' => 'YOUR_KEY',
               'secret' => 'YOUR_SECRET',
               'bucket' => 'YOUR_BUCKET',
           ]
        ];
        $this->s3 = S3Client::factory([
            'credentials' => [
               'key' => $this->config['s3']['key'],
               'secret' => $this->config['s3']['secret']
            ],
        'region' => 'eu-central-1',
        'version' => 'latest'
        ]);
    }
}

并在您的控制器中使用此组件。下面的例子：

class UploadController extends AppController{
    public $components = ['Amazon'];

    public function upload(){
         $objects = $this->Amazon->s3->putObject([
                        'Bucket'       => backetname,
                        'Key'          => $fileName,
                        'SourceFile'   => $this->request->data['file']['tmp_name'],
                        'ContentType'  => 'image/jpeg',
                        'ACL'          => 'public-read',
                        'StorageClass' => 'REDUCED_REDUNDANCY'
                    ]);
    }
 }