phpSPO library - How to copy subfolders in Sharepoint - php

Question

I am using the phpSPO library for sharepoint: https://github.com/vgrem/phpSPO
I am able to copy a folder along with it's files using:
$credentials = new ClientCredential("MyCredentialsGoHere","MyCredentialsGoHere");
$ctx = (new ClientContext("https://MyURL.sharepoint.com/enquiries"))->withCredentials($credentials);
$sourceFolder = $ctx->getWeb()->getFolderByServerRelativeUrl("Shared Documents/Project Templates");
$targetFolder = $sourceFolder->copyTo("Shared Documents/".$test, true)->executeQuery();
However it does not copy any subfolders.
I assume that I have to iterate through the subfolders of my source directory manually doing a copy for each one to the new target directory.
My starting point for this was to list the subfolders in a SharePoint folder:
$credentials = new ClientCredential("MyCredentialsGoHere","MyCredentialsGoHere");
$ctx = (new ClientContext("https://MyURL.sharepoint.com/enquiries"))->withCredentials($credentials);
$sourceFolder = $ctx->getWeb()->getFolderByServerRelativeUrl("Shared Documents/Project Templates");
$subfolders = $sourceFolder->getFolders()->executeQuery();
foreach ($subfolders as $folder) {
print_r($folder);
}
However this doe not work as I expected (it produces no output) and my resources are exhausted.
Any pointers to help me solve the issue or an example of a finished solution would be very helpful.

Answer 1

This will loop the folders in a folder:
$parentpath = $ctx->getWeb()->getFolderByServerRelativeUrl("Shared Documents/Project Templates");
$folders = $parentpath->getFolders();
$ctx->load($folders);
$ctx->executeQuery();
foreach ($folders->getData() as $folder) {
$display = $folder->getProperty("ServerRelativeUrl");
echo ("File name: ".$display."<br/>");
}