Object Storage Service:Append upload (PHP SDK V1)

<?php
if (is_file(__DIR__ . '/../autoload.php')) {
    require_once __DIR__ . '/../autoload.php';
}
if (is_file(__DIR__ . '/../vendor/autoload.php')) {
    require_once __DIR__ . '/../vendor/autoload.php';
}

use OSS\Credentials\EnvironmentVariableCredentialsProvider;
use OSS\OssClient;
use OSS\CoreOssException;

// Obtain access credentials from environment variables. Before you run this example, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set.
$provider = new EnvironmentVariableCredentialsProvider();
// The China (Hangzhou) endpoint is used as an example. Set the endpoint to the actual endpoint. For more information about the mapping between regions and endpoints, see Endpoints.
$endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
// Specify the bucket name. For more information about bucket naming conventions, see Buckets.
$bucket= "examplebucket";
// Specify the full path of the object. Do not include the bucket name. For more information about object naming conventions, see Terms.
$object = "srcexampleobject.txt";
// Specify the strings to append in sequence. After the first, second, and third append operations, the file content is "Hello OSS", "Hi OSS", and "OSS OK", respectively.
$content_array = array('Hello OSS', 'Hi OSS', 'OSS OK');

$options = array(
    'headers' => array(
        // Specify the web page caching behavior when the object is downloaded.
        // 'Cache-Control' => 'no-cache',
        // Specify the name of the object when it is downloaded.
        // 'Content-Disposition' => 'attachment;filename=oss_download.jpg',
        // Specify the expiration time.
        // 'Expires' => 'Fri, 31 Dec 2021 16:57:01 GMT',
        // Specify whether to overwrite an object that has the same name during an append upload. Set this parameter to true to prohibit overwriting.
        // 'x-oss-forbid-overwrite' => 'true',
        // Specify the server-side encryption method for each part of the object.
        // 'x-oss-server-side-encryption'=> 'AES256',
        // Specify the encryption algorithm for the object.
        // 'x-oss-server-side-data-encryption'=>'SM4',
        // Specify the storage class of the object.
        // 'x-oss-storage-class' => 'Standard',
        // Specify the access permissions for the object.
        // 'x-oss-object-acl' => 'private',
        ),
);

try{
    $config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
        "signatureVersion" => OssClient::OSS_SIGNATURE_VERSION_V4,
        "region"=> "cn-hangzhou"
    );
    $ossClient = new OssClient($config);

    // Perform the first append upload. The position for the first append is 0. The return value indicates the position for the next append. The position for subsequent appends is the length of the file before the append.
    $position = $ossClient->appendObject($bucket, $object, $content_array[0], 0,$options);
    $position = $ossClient->appendObject($bucket, $object, $content_array[1], $position,$options);
    $position = $ossClient->appendObject($bucket, $object, $content_array[2], $position,$options);
} catch(OssException $e) {
    printf(__FUNCTION__ . ": FAILED\n");
    printf($e->getMessage() . "\n");
    return;
}
print(__FUNCTION__ . ": OK" . "\n");           

 <?php
if (is_file(__DIR__ . '/../autoload.php')) {
    require_once __DIR__ . '/../autoload.php';
}
if (is_file(__DIR__ . '/../vendor/autoload.php')) {
    require_once __DIR__ . '/../vendor/autoload.php';
}

use OSS\Credentials\EnvironmentVariableCredentialsProvider;
use OSS\OssClient;
use OSS\CoreOssException;

// Obtain access credentials from environment variables. Before you run this example, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set.
$provider = new EnvironmentVariableCredentialsProvider();
// The China (Hangzhou) endpoint is used as an example. Set the endpoint to the actual endpoint.
$endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
// Specify the bucket name.
$bucket= "examplebucket";
// Specify the full path of the object. Do not include the bucket name.
$object = "exampleobject.txt";
// Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the project path of the sample program by default.
$filePath = "D:\\localpath\\examplefilea.txt";
$filePath1 = "D:\\localpath\\examplefileb.txt";
$filePath2 = "D:\\localpath\\examplefilec.txt";

try{
    $config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
        "signatureVersion" => OssClient::OSS_SIGNATURE_VERSION_V4,
        "region"=> "cn-hangzhou"
    );
    $ossClient = new OssClient($config);
    // Perform the first append upload. The position for the first append is 0. The return value indicates the position for the next append. The position for subsequent appends is the length of the file before the append.
    $position = $ossClient->appendFile($bucket, $object, $filePath, 0);
    $position = $ossClient->appendFile($bucket, $object, $filePath1, $position);
    $position = $ossClient->appendFile($bucket, $object, $filePath2, $position);
} catch(OssException $e) {
    printf(__FUNCTION__ . ": FAILED\n");
    printf($e->getMessage() . "\n");
    return;
}
print(__FUNCTION__ . ": OK" . "\n");