setup xdebug on fedora unix using webserver nginx and windows chome browser

We distribute music servers based on Unix Fedora on which an nginx web server runs. The music servers are configured via a dashboard that is called up in the web browser via the IP address of the server and the /[login to view URL] script.  What the dashboard looks like in the browser and a part of the [login to view URL] script can be found in the two pictures in the appendix.  The [login to view URL] script is faulty, so I am trying to understand its function.  I have programmed in many programming languages and have always had a debugging tool with me.  However, this does not seem to be available automatically with the php scripts, but has to be configured as an additional function on the server and on the client.  So I need some help to install a debugging tool for the php scripts, with which I can start the php scripts, set breakpoints, analyze variables and navigate step by step through the php script.  I think with Unix you do this with xdebug, but I am open to any other tool.  Ideally, we install the debugging tool together via Anydesk remote maintenance.  The goal is to debug step by step through the [login to view URL] script and see how the page is built in the web browser.  An example of an error I would like to fix: It happens from time to time that the listboxes of the dashboard are empty and contain no values. If I debug step by step through the php script, I can see how the contents of the listbox are compiled and can recognize the conditions under which the listboxes are not filled with content.