问题 I'm working with a project using PHP and need to implement Google Cloud APIs using PHP Client library, but the authentication does not seem to be working for me. I have created a service account and granted the project owner permissions and I don't want to make authentication by using the GOOGLE_DEFAULT_CREDENTIALS environment variable, I want to use service account authentication. Here's what I have tried: require 'vendor/autoload.php'; use Google\Cloud\Core\ServiceBuilder; use Google\Cloud