There is a VERY complicated configuration tool for a major steel company that runs on this still, last I checked anyway. I left that job ~5 years ago. I've done a few small updates since then for them, but not much.
It was nice though because it allowed the company to just submit a new Spreadsheet and their tool would automatically update. I was very proud of it at the time. Haven't had reason to maintain it though, but it works much faster than other tools that do similar for PHP.
It's ancient and flawed but it converts a SpreadsheetML ( https://en.wikipedia.org/wiki/SpreadsheetML ) aka "Excel 2003 XML" spreadsheet to PHP in real time.
There is a VERY complicated configuration tool for a major steel company that runs on this still, last I checked anyway. I left that job ~5 years ago. I've done a few small updates since then for them, but not much.
It was nice though because it allowed the company to just submit a new Spreadsheet and their tool would automatically update. I was very proud of it at the time. Haven't had reason to maintain it though, but it works much faster than other tools that do similar for PHP.