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For an image hosting web application:
For my stored images, is it feasible to create thumbnails on the fly using PHP (or whatever), or should I save 1 or more different sized thumbnails to disk and just load those?
Any help is appreciated.
Save thumbnails to disk. Image processing takes a lot of resources and, depending on the size of the image, might exceed the default allowed memory limit for php. It is less of a concern if you have your own server with only your application running but it still takes a lot of cpu power and memory to resize images. If you’re considering creating thumbnails on the fly anyway, you don’t have to change much – upon the first request, create the thumbnail from the source file, save it to disk and upon subsequent requests just read it off the disk.