I've been searching for this for a while though I never get a great answer.

I'm looking for a tutorial or code which parses a defined syntax like a new language. Preferably using strtok or tokenizer. 

I need to write a simple language which I will parse later.

Thanks for any help.

**edit** 
The language is quite simple. Basically variable assignment and loops as well as conditional checks. Nothing fancy.

**edit** 
I guess from the answer I got, the title should not be so. Something along the lines of "how to create a language in php" would be better. Thanks.