I recently wrote about using assembler for extending PHP, which certainly never makes sense. Writing that made me remember that Johann once showed me another possibility: Use Borland's Delphi for creating PHP extensions using PHP4Delphi. According to their CVS there isn't much work done for it recently but back in the days Johann used it, it seemed to work. I never used it myself but it might be worth a look if you know Pascal/Delphi and want to extend PHP. That makes way more sense than using assembler - I'm sure, but still I think C is the best choice for that.