[ChrisMarshallNY]

> Do they not happen in php major versions anyway?

PHP has actually been awesome at preserving backwards compatibility.

I wrote a server, when PHP 4 was still the cutting edge, and it still works, now, at 8.1 (although I know that it is being rewritten, in order to leverage things like Laravel).

[mgkimsal]

I set up something for someone in 2003/2004. It was largely PHP4 code that got a bit upgraded to 5.0. We lost touch.

I got a call at end of 2017 saying "this isn't working". Someone else had taken over hosting and been upgrading PHP along the way. There was finally something that broke (some weird dynamic object stuff that was making up for some PHP4 shortfall at the time) and... I did some small patch to get around it but suggested they have someone rebuild, either in PHP 7 or ... any tech from 2017. Just needed to migrate relatively simple database over.

I pointed out that they had basically 13 years of hassle-free system - that's generally a bit outside the norm for that sort of thing, and... that was the recommendation they gave back to their org's board of directors (small non-profit sort of thing).