What is a good PHP/MySQL/AJAX poll system?

Does anyone know of a good working 开发者_JAVA技巧polling system using PHP, Ajax, and MySQL to store the results?

It does not need to have any advanced features, just the basic one vote per person feature.

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Take a look at this. Although it sounds like it may be a bit much for what you need, it is free, it is open source, and it does work.