Frequently Asked Question
You should refer to your welcome Email, or past system notices for in depth configurations.
We do not allow virtual hosted domains to traverse outside of your own webroot, we also disable a number of the more dangerous php functions (as per Welcome Mail - this is not new, we have always done this for going on near two decades), some code expects to access system /etc directory, like WTF gives there, nothing legitimate or sane should expect to leave its own webroot and should never want or need to access a system directory, if your code complains that a php function is not available, please open a support ticket.
The biggest problem is the PHP organisation deprecated mysql_ functions all the way back in php5.6, they warned as of php7 it would be completely removed, many developers sat on their @rse and did nothing, now they along with their codes userbase are in panic stations as everyone moves towards php7 and php developers carried through with their promise and removed mysql_
We made it clear in September 2020 that as of Christmas 2020 we will be upgrading our servers, and will be using php7 and mysql (mariadb) 10.5 - which also brought a few challenges like functions that previously ignored errors, now errors on, for example undefined values, ie: default empty tables must be defined as empty in structure.
Thankfully because this has been coming for a few years, the WWW is full of examples on how to modify your code from mysql_ to mysqli_ but please, spend some time researching before changing anything, don't just take for granted the first google result, and BACK UP your site before you edit anything.