and got
PHP Development Tools (PDT) SDK Feature 3.1.1.201209101312 org.eclipse.php.sdk.feature.group Eclipse.org
It is now listed on the "Installed Software" tab of the "Eclipse SDK Installation Details" dialog.
** problem **
I cannot find PHP anywhere in Preferences.
For all intents and purposes it's missing in the platform UI.
** additional info **
I have another instance of eclipse in a different folder (for Android development). It also has PDT, but that one has issues, and I cannot set up a debugging profile for PHP. Hence I tried a fresh distro.