Upgrading to PHP 5.5> on FreePBX Distro 13

Half a year ago I tried to upgrade my FreePBX 11 machine from PHP 5.3 to 5.5 and it broke the GUI altogether. Probably due to some proprietary rights files you’ve installed.

I am now with 12 version and plan to upgrade to 13. Is there still a problem with upgrading PHP or it is safe now to upgrade either with 12 or the latest FreePBX 13?

I am not sure what that means. Things are written in PHP. PHP deprecates things and changes things. Upgrading PHP can go flawless or can cause bugs. That is not a “FreePBX thing” or a PHP thing. it is how all interpreted languages are.