move_uploaded_file（）无法将文件移动到Google App Engine上的Google存储空间（php 7.2）

Question

$filename = generate_filename($type, $id);
$filepath = "gs://$bucket.appspot.com/uploadedfiles/$filename";
error_log("trying to move ".$_FILES['image']['tmp_name']." to ".$filepath);
if (file_exists($_FILES['image']['tmp_name'])) {
    if (move_uploaded_file($_FILES['image']['tmp_name'], $filepath)) {
        // ...
    } else {
        error_log("could not move the uploaded file");
    }
}

This is what I'm seeing in the log:

trying to move /tmp/php69rSck to gs://my-project.appspot.com/uploadedfiles/sale-image-3-1545631667.1964.jpg

could not move the uploaded file

How can I determine why this is failing?

Answer 1

I figured out the problem. I had forgotten to enable the gs:// stream wrapper:

require_once 'vendor/autoload.php';
use Google\Cloud\Storage\StorageClient;

$storage = new StorageClient();
$storage->registerStreamWrapper();