change from php 5.6 to php 7.1

Please inform as to how, if it is possible, to change php 5.6 to php 7.1 for dolphin 7.3.5.

At a server where dolphin is the primary, a sub-site which uses joomla requires upgrade to php 7. When that sub-site is upgraded it does not show but gives a blank page. Also when the server tried to adjust that, we were getting a notice about mbstring requirement for the boonex dolphin site.

That notice read this:

mbstring extension not installed. Warning! Dolphin cannot work without mbstring extension. 

The server agent said I had to get a developer to deal with that. Does anyone have experience with this.

My main question is if dolphin can be upgraded from php 5.6 to php 7.1

Forum topic for this issues.

Thanks Expertzkris!

Welcome!

It can be; others have went through on their own outside of Boonex and replaced the problem areas.  However, I would just go with php 5.6 for now.  The problem is that a lot of hosting companies are pushing everyone to php 7.  One way around that is to run a VPS or dedicated server where you can put any version; including multiple ones on the same server.  Some hosts are charging extra for php 5.6; just shop around if need be.

Thanks geek_girl. Insightful as Usual.