Im sure you already figured this out by now, but incase you havent (and for the sake of providing a lonely question with an answer)
(this assumes you already have xdebug working with PHPStorm, and are able to debug through PHPStorm)
In the current version of PHPStorm (10.0 as of the time of this writting), in the debug window, there is a yellow circle with an "@" in it. Clicking that will show you the memory addresses.
In my examples below, notice my $ds
object. It just lists the class (DBConnection
). After turning on the addresses, you can see them. (DBConnection@69796600
)