Is glob a bad idea?

[eluser]Cro_Crx[/eluser]
More seriously, I would create the website now and only start optimising when you hit any speed issues. Having said that, attempting good design practises from the start will make everything a lot easier. Is it not possible to store the location of the images in the database for quick retrieval ? It would probably be a nicer way to implement it and wouldn't require much more code.

Best thing to do would be to try and see how you go. If the load times are slow then change it

Also: I couldn't find any performance benchmarks for php's glob.