使用php的shell_exec运行几个命令

I've tried for a while now every way possibly known to me, and have yet to crack this thing, it's probably very trivial but couldn't find the answer.

I want to run several commands at once using php shell_exec, for example shell_exec("cd ..; dir") but I am unable to find how to execute a few commands, what is the seperator? is it ;, is it /n? nothing seems to work.

Please note I am running with windows.

https://superuser.com/a/62854

&& will execute command 2 when command 1 is complete providing it didn't fail, & will execute regardless.