Is it the phillips head that is stripped or the threads? If it's the screwhead, take a hacksaw and cut a slot across the top, then use a flat bladed screwdriver (larger than the screw head) to turn it out.
One trick for phillips heads for future reference: Put a dab of any "gritty goo" (EG toothpaste w/ baking soda, petroleum jelly with some sand, gojo, any pumice "liquid" hand cleaner) on the screw head and/or screwdriver. Basically makes the head of the screwdriver gritty like sandpaper, and will extract 90% of those stripped screws.
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