Python and php CLI questions

Can i run python scripts with CLI?
What about php?
do i need to install my own php or can i use the current instalations?
If i can use a current installation i would need some help on how to add the path to my environmet…

export PATH:="/usr/bin/php"

should be something like that i guess.

BTW… is it possible to point the php binary on the beggining of the script the same way is done with python
as is is described here