B737-800 Captain reported encountering wake turbulence on descent into PHX in trail of an A330.

Narrative

We were descending in VMC via the HYDRR 1 Arrival into PHX for Runway 25R. At FL 250 about 12 miles west of the SPINK intersection the aircraft shuddered then rolled left rapidly and the nose yawed. I immediately grasped the yoke and not sure if I turned off the autopilot or if it disengaged; but I rolled the aircraft back to level flight. I was looking outside and saw the roll coming back through 10 degrees; I asked the F/O if he saw how far left we banked. He said he thought 20 degrees. I called back to see if the F/A's were ok. They said three of them were in the aft galley and had been tossed around and the contents of the aft galley bins had been thrown on the floor. Cans; drinks and ice. One F/A was in the aisle and said she had been able to brace against a seat. No one reported any injuries at this time. We asked ATC what we were following and they reported a (other carrier) aircraft. I noted the wind at altitude was 280/20 which was a direct tailwind to our track. As we continued we got occasional buffeting which may have been wake related. As we got in the terminal area; ATC issued a visual and I attempted to remain above the A330's flight path on final. I even slowed more to allow more distance between us. I flew one dot high on the ILS glideslope yet at 800 ft AGL; we encountered another minor roll event. Aircraft remained controllable and we continued normally. On the ground; post flight; I spoke with all four F/A's; again asking if they had any injuries. They said just sore and possible bruising from being tossed against the aft galley but did not say they were injured.While we were 12 miles in trail; we had no idea we were following a heavy. Perhaps more in trail spacing for heavy and 737 types.