Our next STABLE merge will permanently break compatibility with PHP
versions below 7.1.x. Our official minimum is 7.2 (though we strongly
recommend 7.4 or 8.1).
Please make sure you're compatible before you next update! :)
We're not yet sure when our minimum will switch to 8.1, but if you can,
we'd recommend upgrading to that.
Upgrading on most distributions from the past 8 or so years is not too
difficult, but if you're on very old distributions, we might recommend
upgrading the entire distro. Newer rrdtool and MySQL is a benefit too.
Thanks,
adam.