Curly braces and semicolons? Wait, that's actually C.

The README showcases some opcodes. Maybe they borrowed PHP's bytecode format or the VM design? If true, that would actually be a pretty neat thing to borrow, since PHP has made a lot of improvement in VM performance and memory management lately.

PHP was a reference for me in terms of the parser generator because php-src is implemented with Flex and Bison.

However, come to think of it, it's more close to Python and C then it is PHP.