php 5.6

I'm currently running Xenforo 1.5 with PHP 5.4 and SQL 5.6. I am testing an upgrade to 2.1 on the same server which recommends PHP 7.2. I'm happy to upgrade but don't want to break the production site if it is not compatible with the latest PHP version. What is the latest PHP version that is...

Bit a noob when it comes to SSL certificates. I'm currently in the process of upgrading to PHP 5.6 though I use a SMTP to send my forums email which means with PHP 5.6 it has to validate the SSL certificate in order to actually send email our I'll get an error similar to the below. My...