readdir

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I have been writing some code that visits each directory stored within one
directory in turn, pics a random image from it and displays that image.

I have the code working fine, apart from one small quirk that I can't really
understand.

In one version of the implementation, the directories appear to be getting
accessed in the order they are uploaded to / edited on the server starting
with the most recent upload/change - which is handy because it is what I
wanted.

But in another slightly different version of the same bit of code, it lists
them in some weird order that I can't fathom.

I suppose my question put simply is, what is the default ordering of
directories when PHP uses the readdir method? And is there anyway to force a
specific ordering to the directories before PHP searches down them?

Any help would be greatly appreciated.

Regards,

Toby

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