Access to a remote folder on the Windows local network in php

Hello. While working on the project, I encountered a problem that is not solved without the intervention of knowledgeable people.

The question is that through the script I can not get at least a list of directories and files on a network drive in the local network. Globally, the task is this: - you need to take text from one table, and from another table the corresponding application to this text, “stuff” it all into one file and put it in a folder on a remote computer, where the script (also in PHP) should figure out what to what "and on the corresponding tables in the same DB, but already by other machine.
I broke the task into parts, and for a start I decided that it would be more convenient to understand how I could get from the script to a network drive in a local network on a remote computer. I found in the manual a section, "Functions for working with directories" and following my intuition, I tried to get a list of files and folders in a directory (the code from the example).

$d = dir("file://13.73.2.1/d$"); echo "Дескриптор: " . $d->handle . "\n"; echo "Путь: " . $d->path . "\n"; while (false !== ($entry = $d->read())) { echo $entry."\n"; } $d->close(); 

To which I was answered in the browser with something like:

dir () remote file host access not supported

I didn’t deal with it, I decided to try an example from a book that I had on hand, where it was said that the file_get_contents() function also solves similar problems and I tried it in action, only now I indicated the protocol not file:// , but ftp:// . I wrote the following:

 file_get_contents("ftp://13.73.2.1/d$"); 

Why did I write ftp:// here? at that moment, I still did not understand that an FTP server must be configured for such a record.

the answer was approximately

failed to open stream .... operation failed and more was written, permission denied

From what I concluded that my script has no rights to get into the network. I forgot to say that all this happens on the Windows 2008R2 + IIS7 + php7.1 server. Rummaged and found that all sites in IIS are launched under a specially created user IUSR (somehow so called). And that not all of it can be run. In the IIS Manager I Authorization settings, I set my current user (in the "anonymous user authorization") and just in case in the Application Pool, for my Classic.NET AppPool v.4 pool in the advanced settings, I also started it on behalf of the user. Further checked from what user, now comes the request. get_current_user();

Having received a positive result, I thought that now everything will work ... but alas, it did not work. Next, I tried directly in the browser to register the address of the network drive, assuming that I generally do not get access from this environment. Wrote as follows: \\dnsname\d$ . In the browser, I showed everything as it should, while substituting the file:// protocol at the beginning of the recording. But for some reason, the same trick from the script does not work. What else did you try:

• put three (four) slashes before the address of a network folder somewhere on the network saw that it was written that way, although I did not understand why
• tried to access from the command line dir \13.73.2.1\d$ - the result was positive.

At the moment, it was not possible to advance further than these experiments, therefore I am asking for help here.