public Guzzle\Service\Resource\Model listBuckets();

<?php

require dirname(__FILE__) . '/../vendor/autoload.php';

$secretId = "SECRETID"; //Replace it with the actual SecretId, which can be viewed and managed in the CAM console at https://console.cloud.tencent.com/cam/capi
$secretKey = "SECRETKEY"; //Replace it with the actual SecretKey, which can be viewed and managed in the CAM console at https://console.cloud.tencent.com/cam/capi
$region = "ap-beijing"; //Replace it with the actual region, which can be viewed in the console at https://console.cloud.tencent.com/cos5/bucket
$cosClient = new Qcloud\Cos\Client(
    array(
        'region' => $region,
        'schema' => 'https', //Protocol header, default is http
        'credentials'=> array(
            'secretId'  => $secretId ,
            'secretKey' => $secretKey)));

try {
    $result = $cosClient->listBuckets();
    // Request successful
    print_r($result);
} catch (\Exception $e) {
    // Request failed
    echo($e);
}

Array
(
    [data:protected] => Array
        (
            [Owner] => Array
                (
                    [ID] => qcs::cam::uin/100000000001:uin/100000000001
                    [DisplayName] => 100000000001
                )

            [Buckets] => Array
                (
                    [0] => Array
                        (
                            [Name] => examplebucket-1250000000
                            [Location] => ap-beijing
                            [CreationDate] => 2016-07-29T03:09:54Z
                        )

                    [1] => Array
                        (
                            [Name] => examplebucket2-1250000000
                            [Location] => ap-beijing
                            [CreationDate] => 2017-08-02T04:00:24Z
                        )

                )

            [RequestId] => NWE3YzgxZmFfYWZhYzM1MGFfMzc3MF9iOGY5OQ==
        )

)