[Phpwm] displaying images on screen

[Tim Williams]

On Thu, 2 Oct 2008, Alex Mace wrote:

> If you're operating on files that are already on the system then by
> definition they'll already have unique filenames...

Yes, but the processed output needs to have a different unique name for 
every possible operation, otherwise if user 1 rotates file.jpg by -90 and 
user 2 rotates it by +145, with those requests coming into the server at 
the same time you could have one of four possible outcomes, depending on 
the precise timing of the requests :

1) Both users see a -90 rotation
2) Both users see a +145 rotation
3) Both users see a +55 rotation
4) Both users get what they want.

Unfortunatly, in this situation, you can't predict exactly which outcome 
will happen in any given case.

Daniels suggestion of incorporating the degree of rotation into the file 
name would solve this problem and give a unique file name for every 
possible variation for any given starting image.

Tim W

-- 
Tim Williams BSc MSc MBCS - Euromotor Autotrain
Web : http://www.autotrain.org
Tel : +44 (0)121 414 2214 (ext 42214 on internal phone)