使用SDK功能前，需要新建s3Client，代码如下：

require '/path/to/autoload.php';
use Aws\S3\S3Client;
use Aws\Exception\AwsException;
use Aws\Credentials\Credentials;
​
const endpoint = '<your-endpoint>'; // e.g. http://endpoint or https://endpoint
const access_key = '<your-access-key>';
const secret_key = '<your-secret-key>';
​
$credentials = new Credentials(access_key, secret_key);
​
$s3Client = new S3Client([
    'region' => 'ctyun',                // region固定填ctyun
    'version' => '2006-03-01',          // s3接口版本号，固定填2006-03-01
    'credentials' => $credentials,
    'endpoint' => endpoint,
]);

参数说明：