Cookies on PHP Web Application No Longer Functioning

I have this simple Web Application under

patient-records.com

Which is designed in PHP. The Credentials for login are:

Username:demo
password:demo

Up to a few years ago, last I checked, the application worked flawlessly.

However, out of the blue, cookies are no longer being set for this application in Google Chrome.

The only way for me to run this is inside Internet Explorer.

I cannot understand what has changed and why this is no longer supported in Chrome. I set cookies in the following manner

 setcookie($id, "true");

Is this no longer supported inside Chrome?

What is the new way to set cookies then?