Turning off iPhone and leaving it in the car?

I'm going to Six Flags tomorrow in California and was wondering if it was safe to turn off my iPhone completely and leave it in the car. Would it damage anything even if it was turned off?

Iphones are everywhere so it won't be that big of a chance of your being stolen

Well to be safe, leave it in those sorta lunchboxes that keep your food cold, a thermos.

Having it on means extra heat running through stuff, but you can easily melt plastic/etc in a car if it's hot and in the sun. Leave it somewhere dark and cool.

Never live things in your car! We had the car window broken and the phone stolen. I carry my phone with me all the time.