There are lot of restriction on Adult Images and contents on the web, some user abuse the opportunity you give to them to upload images that might get your website into trouble, Not all webmasters have the time to be screening all images uploaded to their server before it is published. It can be painful to know which type of Image that exposes body parts through just a little line of coding for this reason we are going to borrow a class from phpclasses.org to help use view this images and screen them out, Do you know an interesting part, This class has a tolerance control that can help you set the amount of expose able parts, We don't want to block a picture of woman breast feeding her baby when we are building a charity site.
Full Tutorial at http://www.codingsavvy.com/2016/01/how-to-prevent-uploading-of-drape-and.html