I have a 2006 PT,on my way home it just stopped,no warning and all else is fine.

How many miles? Has the timing belt been replaced?

Could be the timing belt as Bob said but it just might be something else. Again, mileage can tell a lot. If the alternator died and you were running on just battery power, The problem is the alternator and the battery. Have it towed to a good mechanic and have him diagnose the problem. You could spend much more doing it yourself.

Have an '08 P/T standard the motor just died at a stop sign and barely would jump. Replaced battery, but just cranks without hint of starting n feels like no compression moving motor. Sounds different turning over as well. Suspect timing belt, but wouldn't an engine light come on? Has 98K miles. Radiator and oil were full; no mix of either on oil stick.