I need a provision of detecting the adult image in the websites where the user uploads the pictures to determine that a picture isn’t acceptable for my site. Can any one suggest the method to do this?

I need kind of open source code/program (PHP) that could be implemented in the website and stops the user to upload the picture. Earlier to the my idea there is a class image filter http://www.phpclasses.org/browse/package/3269.html But I want code which is similar to this or maybe even more advanced.

php web-services image web-applications image-processing
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