Hi guys
Can we still install and use php 5.2 or php 5.3?

Got an old website that needs rescue
Coz of the depricated mysql functions

Much appreciated
Cheers

You can, most package managers let you specify the version you want

The question isn't if you could but rather if you should

On Linux: Install old package versions or a complete old distribution (e.g. Debian 6) in a virtual machine (please isolate this outdated software).

Don't use them. There are reasons they were deprecated. You could convert them, most functions work the same.

You should be able to migrate to PHP 5.6 without any issues, unless your using some really outdated functions.

Moving past 5.6 would require you to drop the mysql_ functions and use mysqli_ or pdo, and changing over any deprecated functions.safe bet, build a test server with 5.6 and do a full test with the error log open and see what breaks.