use Backblaze\B2Client;
use Backblaze\HttpClient\CurlHttpClient;

$httpClient = new CurlHttpClient();

$client = new B2Client($httpClient);

$client->authorize('accountId', 'applicationKey');

// see "b2_create_bucket" operation in the docs
$bucket = $client->createBucket([
    'BucketName' => 'my-bucket',
    'BucketType' => B2Client::BUCKET_TYPE_PRIVATE, // or BUCKET_TYPE_PUBLIC
]);

// change the bucket to public
// see "b2_update_bucket"
$updatedBucket = $client->updateBucket([
    'BucketId' => $bucket['bucketId'],
    'BucketType' => B2Client::BUCKET_TYPE_PUBLIC,
]);

// retrieve a list of buckets on your account
// see "b2_list_buckets"
$buckets = $client->listBuckets();

// delete a bucket
// see "b2_delete_bucket"
$client->deleteBucket([
    'BucketId' => $bucket['bucketId'],
]);

// retrieve an array of file objects from a bucket
// see "b2_list_file_names"
$fileList = $client->listFiles([
    'BucketId' => '4a48fe8875c6214145260818',
]);

$fileExistence = $client->fileExists([
    'BucketId' => '4a48fe8875c6214145260818',
    'file' => 'path/to/file',
]);

// upload a file to a bucket
// see "b2_upload_file"
$file = $client->upload([
    'BucketId' => '4a48fe8875c6214145260818',
    'FileName' => 'path/to/upload/to',
    'Body' => 'File content',

    // the file content can also be provided via a resource
    // 'Body' => fopen('/path/to/source/file', 'r'),

    // or as the path to a source file
    // 'SourceFile' => '/path/to/source/file',
]);

$fileId = '4_z942111fa0b943d89249a0815_f1001e9fa2c42d9a8_d20170119_m162445_c001_v0001032_t0057';

// download a file from a bucket
$client->download([
    'FileId' => $fileId,
    'SaveAs' => '/path/to/save/location',
]);

// delete a file from a bucket
// see "b2_delete_file_version"
$fileDelete = $client->deleteFile([
    'FileId' => $fileId,
    'FileName' => '/path/to/file',
]);