Question

Does it matter which version of PHP I use?

I have a WordPress server that I set up using server pilot, I see that I can change versions of PHP on the fly. What is the general difference between 5 and 7? And is it safe to switch versions while my server is running?

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There are some interesting new features and performance enhancements in PHP 7. There are also some changes to syntax for a few things. Most scripts written in the last few years for PHP 5.x will run without a problem and WordPress has no problem at all with it. You will need to make sure that plugins and themes you are using don’t rely on features that were removed or depreciated for PHP 7 but otherwise I would recommend the upgrade.