Secure User Image Upload Capabilities in PHP

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Regarding file names, random names are definitely a good idea and take away a lot of headaches.

If you want to make totally sure the content is clean, consider using GD or ImageMagick to copy the incoming image 1:1 into a new, empty one.

That will slightly diminish image quality because content gets compressed twice, but it will remove any EXIF information present in the original image. Users are often not even aware how much info gets put into the Metadata section of JPG files! Camera info, position, times, software used… It’s good policy for sites that host images to remove that info for the user.

Also, copying the image will probably get rid of most exploits that use faulty image data to cause overflows in the viewer software, and inject malicious code. Such manipulated images will probably simply turn out unreadable for GD.

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