auto actions, php, and substitutions

Can I use field substitutions inside the PHP code area of auto actions plugin?

example: I have php code with a geocode query/action that I only want to run after someone saves their profile either in front or backend. (so member or admin). If I do not specify in the query the code will geocode every user in the database.

I can get around this if I use a substitution in the query like this:

change this:
WHERE $searchfield = 'Yes'

to this:
WHERE $searchfield = 'Yes' and a.id = [user_id]

That way it would only geocode the user whose profile is being saved.

Is that ok to use in the PHP code area?

Can I use field substitutions inside the PHP code area of auto actions plugin?

Yes.

Is that ok to use in the PHP code area?

Should be.