Re: PHP3 and 64-bit land

On Sat, Feb 27, 1999 at 06:50:13PM +0200, Zeev Suraski wrote: > > > On Sat, 27 Feb 1999 sas@schell.de wrote: > > > Well, I don't intend to change that specific part. It appears to me that > > index_ptr is just recycled. > > As a general approach, PHP usually uses void pointers to store any > enumerated type (long, pointer, int, etc). There's one exception I can > think of, which is the hash, that uses unsigned integers to store the > numeric offsets. > 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. -- Regards, Sascha Schumann | Consultant | finger sas@schell.de | for PGP public key -- PHP Development Mailing List http://www.php.net/ To unsubscribe send an empty message to php-dev-unsubscribe@lists.php.net For help: php-dev-help@lists.php.net