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Thanks for the second explanation. If I hadn't wasted so much of your time, I would say this whole example is hilarious :) I managed to construct the exact set of circumstances to ensure that the "for" and "foreach" loop gave identical answers: a) I chose five variables for @stack b) I...

Thanks. That worked perfectly. That was probably the clearest technical explanation I've seen. Regards, Alan

I need to be able to maintain a stack which varies in length according to circumstances. I want to use shift() and unshift() at the left, and push() and pop() at the right. I have noticed strange behaviour when using shift(). My simple example below shows the problem. In this example, when I...