Re: [PHP-DEV] PHP3 and 64-bit land From: Rasmus Lerdorf (rasmus <email protected>)
Date: 02/27/99

> > Resources use hash tables to store themselves, and they usually use the
> > numeric indices. I think it's extremely safe to use 32-bit integers as
> > unique identifiers for 64-bit pointers, by simply casting them. You'd
> > have to be extremely unlucky to bump into a problem because of this data
> > loss. Your chances of winning the lottery are much much bigger.
>
> I disagree here. The chance of having the same ptr in 32 bit is about 1 in
> 2^32 = 4,294,967,296. If you come to Germany, your chance to win the lottery
> ("6 aus 49") is about 1 to 49!/43! = 10,068,347,520.
>
> It's extremly safe, but you risk random, non repeatable crashes produced by
> playing that way.

Would there be a big drawback to using a long here instead of an int for
unique identifiers?

-Rasmus 

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