I don’t get it. Why on earth don’t the very smart dev people around PHP simply write “official” upgrade wrappers for each release, let alone for something like 5.6 to 7.0?
As a real world example I’ve used MySQLConverterTool from Github on 2 medium sized projects and didn’t have to tweak the end results, it “just worked”, and I couldn’t help thinking “my goodness, why don’t smart people write more of these converters?” so the rest of us have a better chance of staying uptodate with our projects.