A thumbnail is a smaller version of an image. We use thumbnail to save download size & time for visitors. When a visitor visit a page with thumbnails, he can click on a thumbnail to see a larger version of the image. Thumbnails usually seen in any image gallery sites, online shopping, and many more
This tutorial will teach you how to make thumbnails from an upload script in PHP. I will use a 100*100 thumbnail as an example. You can change the dimensions to whatever you like.
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