Did you update to Mavericks? The new Ruby default is 2.0.0 instead of 1.8.7 so some APIs have undoubtedly changed and String#to_a may no longer be available. Beyond that, not sure.
I haven't been editing any PHP for several weeks so not sure when it stopped working but I use the "out of the box" PHP bundle which has a doc
autocomplete that now is giving the following error:
As far as I know I haven't made any changes. Is there any way I can get this back to working? I use this function all the time.