what happens to me is that I have to work on a project that is in laravel4.2 and my xammp has php 7.2.3 and when I try to run the project I get the error Mcrypt PHP extension required. I have tried to change the version of Xammp but the error persists
You must check in XAMPP the php.ini file where you must locate the following 2 files (if they exist)
As notes they have a semicolon at the beginning which indicates that they are disabled; therefore you must remove these symbols so that they are as follows
Now I understand that you say you are working on a project already done