How Do I "open folder in explorer" in Netbeans PHP

I am using the QuickOpener plugin. It is available directly in the Tool->Plugin menu in NetBeans.

Then I go to Tools->Options->Keymap and add the alternate CTRL+L shorcut to 'Open in the OS file system browser'

Your all set after this!

You can use Path Tools plugin (you have to download it from the site and install by manually adding it in downloaded section in NetBeans plugin menu)

There is also more recent plugin QuickOpener for newer NetBeans versions.

Other nice plugin that offers this functionality is CoolEditorActions, available through update center in Infrastuture category.