Re: When is "z" != "z" ?

-TG: Thanks for your explanation and time. Normally, I don't alpha++ anything -- not to criticize others, but to me it doesn't make much sense to add a number to a character. But considering the php language is so string aware, as compared to other languages, I just tried it on a lark just to see what would happen. Okay, so I found out it's limitations and quirks. But, you must admit that it is confusing to have a loop that goes from "a" to "z" and considers "aa" but not "aaa". Now, if the loop just went from a to z, then I would think that would be logical. But I fail to see the logic behind considering "aa" but not "aaa" in the evaluation. But then again, I'm not that informed. Enough said. tedd At 12:21 PM -0400 6/5/06, <tg-php@gryffyndevelopment.com> wrote: >I know this discussion doesn't need to continue any further..hah.. but I think the biggest >confusion people are having is that they're looking at two things and assuming that PHP >operates the same on both and these two things serve different purposes. > >1. Incrementing strings: Best example giving was "File1"++ == "File2" or >"FileA"++ == "FileB". In that case, wouldn't you want it to go from FileZ >to FileAA? Makes sense right? > >2. Comparing "greatness" of strings: Rasmus mentioned this earlier, but I wante to >illustrate it a little more because I think it was overlooked. If you have a list of names, for >instance, and you alphabetize them, you'd get something like this: > >Bob >Brendan >Burt >Frank >Fred > >Just become a name is longer doesn't mean it comes after the rest of the names in the list. > So in that vane, anything starting in "A" will never be > something starting with a >"Z". a < z aa < z aaa < z because: > >a >aa >aaa >z > >When using interation and a for loop and " <= z" it gets to "y" and >it's true, gets to "z" and it's still true, then increments to "az" >and yup.. still < "z". As mentioned, it's not until you get to something starting >in "z" with something after it that you're > "z". > >So hopefully that makes a little more sense. > >-TG > > > >= = = Original message = = = > >tedd wrote: >> At 1:09 PM -0700 6/4/06, Rasmus Lerdorf wrote: >>>> I agree with [1] and [2], but [3] is where we part company. You see, if you are >>>> right, then "aaa" would also be less than "z", but that doesn't appear so. >>> Of course it is. >>> >>> php -r 'echo "aaa" < "z";' >>> 1 >> >> You missed the point, why does -- >> >> for ($i="a"; $i<="z"; $i++) >> >> echo($i); >> >> >> -- not continue past "aaa"? Clearly, if "aaa" is less than >> "z" then why does the loop stop at "yz"? > >I thought I explained that a few times. The sequence is: > >a b c ... x y z aa ab ac ... yx yy yz za zb zc ... zy zx zz aaa aab > >Your loop stops at yz and doesn't get anywhere near aaa because za > z > >-Rasmus > > >___________________________________________________________ >Sent by ePrompter, the premier email notification software. >Free download at http://www.ePrompter.com. > >-- >PHP General Mailing List (http://www.php.net/) >To unsubscribe, visit: http://www.php.net/unsub.php -- ------------------------------------------------------------------------------------ http://sperling.com http://ancientstones.com http://earthstones.com