You might have heard that the support for PHP v5.x and PHP v7.0.x stopped in December 2018.
As you could read here:
PHP v5.6 reached its EOF (end of life) in December 31st, 2018.
PHP v7.0 reached its EOF (end of life) in December 3rd, 2018.
What you should be even more concerned about is that there won't be any security fix for PHP v5.x and PHP v7.0.1 from the end of December 2018.
You coud read about that here:
Considering the fact that the number of security fixes made available for PHP v5.x and PHP v7.0.x was quite significant, it means that you must upgrade your server to PHP v7.1 or PHP v7.2 for secuirty reasons.
Before you do that, make sure that any PHP technology that you are using is compatible with PHP v7.1 or PHP v7.2 and if it is not, consider upgrading it to a more decent version which supports these releases.
Major Security Risk
Be aware that running PHP v5.x and PHP v7.0.x is a major security risk.
It could result into having your website or, in some circumstances, even the whole server exploited.
Don't risk to have your server infected with malware or manipulated by non-authorized people. Act ASAP!
If you need a system administrator or web developer to assist you on upgrading your server and 3rd party technologies to PHP v7.1.x or PHP v7.2.x I'm available to help.