将文件上传到Google云端硬盘API

Question

需要有关google drive API的帮助。任何帮助，将不胜感激。在画布上绘制图像并保存到可以工作的文件夹，但我想从其保存路径获取该文件并将其上传到谷歌驱动器。以下是我的代码。我没有在upload.php中收到任何错误，但无法上传到谷歌驱动器，所以不确定我哪里出错了。

save.php

   $data = $_POST['img'];
   $data = str_replace('data:image/png;base64,','',$data);
   $data = str_replace(' ','+',$data);

   $img = base64_decode($data);
   $path = 'images/'.uniqid().'.png';

   if(file_put_contents($path,$img))
   {
       print $path;
       require "upload.php";
   }
   else
   {
      header("HTTP 500 Internal Server Error");
   }

upload.php的

$client->setClientId('');
$client->setClientSecret('');
$client>setRedirectUri('');
$client->setScopes(array('https://www.googleapis.com/auth/drive.file'));


$fileMetadata = new Google_Service_Drive_DriveFile(array(
  'name' => 'photo.png'));
  $content = file_get_contents($path);
$file = $driveService->files->create($fileMetadata, array(
  'data' => $content,
  'mimeType' => 'image/png',
  'uploadType' => 'multipart',
  'fields' => 'id'));
printf("File ID: %s\n", $file->id);