Markus Fischer writes:
> Implictely is more error prone.
How so? Can you give an example?
> On Wed, Dec 19, 2001 at 04:12:02PM -0800, Lars Torben Wilson wrote :
> > Markus Fischer writes:
> > > Why not just check the type of the parameter? No conversion
> > > needed at all. If its a long -> exit/no show it. If anything
> > > else (well, thats to argue, but not the point) exit and show.
> > > It would be that easy. And, in that case, I don't care about
> > > the number of broken scripts. Prove there are more then you
> > > got fingers on your hand. And even those, you can fix under a
> > > second.
> >
> > Because then exit('5') and exit(5) would still have different
> > behaviours, which is the current situation and which is the root of
> > the problem. If the implicit conversions are done, we end up with:
> >
> > exit('5') : prints '5' and sets exit code to 5
> > exit(5) : prints '5' and sets exit code to 5
> > exit('Some message'): prints 'Some message' and sets exit code to 0
> >
> > ...etc. Existing scripts which use exit() to output a message would
> > still output the same message they currently do, so we maintain
> > backward compatibility. The only difference would be that exit() would
> > work the same way other php functions do--for instance, we expect the
> > same output from 'echo chr(65);' and 'echo chr("65");', right? Why
> > should exit be any different?
> >
> > > On Wed, Dec 19, 2001 at 03:33:15PM -0800, Lars Torben Wilson wrote :
> > > > Vlad Krupin writes:
> > > > > Please, understand me correctly - I have nothing against exit() working
> > > > > in the same manner regardless of the type of the argument. I would love
> > > > > to see that. The problem is that (1) it already accepts a string, and
> > > > > has been working that way for a long time, so this can't go away, and
> > > > > (2) there is no other way (AFAIK) to set exit codes, and some people
> > > > > need that. Those are somewhat contradicting requirements, so we might
> > > > > have to compromise.
> > > > >
> > > > > I do have a problem with the compromise you proposed though, if I
> > > > > understood you correctly. You suggest using something like
> > > > >
> > > > > > exit("1boo")
> > > > >
> > > > > And having exit() parse the first digit out. That's BAD. What if
> > > >
> > > > It's not parsing anything. It's just converting to int using the well
> > > > documented rules of string to integer conversion which have existed in
> > > > the language for years. The language is pretty much impossible to use
> > > > without running into implicit type conversions--it's designed for
> > > > it. That's why the current behaviour of exit() breaks consistency.
> > > > Please, check out the Type Juggling section of the manual. This
> > > > shouldq not a special case, but it currently is treated as one. It
> > > > should behave the way the rest of the language behaves.
> > > >
> > > > > someone already uses exit("123, 456 servers are unavailable"); or
> > > > > something similar. How should we parse something like that? Chances
> > > >
> > > > Again, we don't. We let the language deal with it like it does every
> > > > other string->integer conversion.
> > > >
> > > > > of that are slim, but just as good as Zeev's argument where he says
> > > > > that there are scripts out there that rely on the current
> > > > > implementation of exit(), e.g. one of his own. Jamming two values
> > > > > into a storage space designed for a single value (a string) is bad
> > > > > :(
> > > >
> > > > In the case you gave, the only difference the user would notice
> > > > would be that the exit status of the script would be 123 instead of
> > > > 0. It would still print out the '123, 456 servers are unavailable'.
> > > >
> > > > > Vlad
> > > > >
> > > > >
> > > > >
> > > > > Lars Torben Wilson wrote:
> > > > >
> > > > > >Vlad Krupin writes:
> > > > > >
> > > > > >>Lars Torben Wilson wrote:
> > > > > >>
> > > > > >>>Perhaps I have not explained my position. I don't care whether it
> > > > > >>>outputs the exit status as a string--as long as it sets the error code
> > > > > >>>appropriately *as well*. By appropriately, I mean that 'exit("boo");'
> > > > > >>>would a) print 'boo' and b) return with exit status 0, but
> > > > > >>>'exit("1boo")'; would a) print '1boo' and b) return with exit status
> > > > > >>>1. This would be consistent with PHP's type conversion rules, and
> > > > > >>>would also tend to behave in the way that the programmer expects it
> > > > > >>>to.
> > > > > >>>
> > > > > >>Yikes. This is way worse than overloading. In school they called that
> > > > > >>data-coupling, I think. In real life this is called a hack.
> > > > > >>
> > > > > >>Sorry, but a -1 on this.
> > > > > >>
> > > > > >>Vlad
> > > > > >>
> > > > > >
> > > > > >No, it's called loose typing. See
> > > > > >
> > > > >
>>http://www.php.net/manual/en/language.types.string.php#language.types.string.conversion
> > > > > >
> > > > > >We have a language here which considers the integer value of "5" to
> > > > > >be 5, and an exit() construct which ignores that.
> > > > > >
> > > > > >For instance:
> > > > > >
> > > > > > shanna% php -q
> > > > > > <?php exit('5'); ?>
> > > > > > 5
> > > > > >
> > > > > > shanna% echo $?
> > > > > > 0
> > > > > >
> > > > > > shanna% php -q
> > > > > > <?php exit(5); ?>
> > > > > > 5
> > > > > >
> > > > > > shanna% echo $?
> > > > > > 5
> > > > > >
> > > > > >How much sense does this make? None, as far as I can see.
> > > > > >
> > > > > >What I'm proposing is to make the behaviour of exit() _not_ depend on
> > > > > >the type of its argument. At present if the argument is an integer
> > > > > >exit() prints it and sets the error status, but if it's any other
> > > > > >type, exit() just prints it and doesn't set the exit status. This is
> > > > > >more complex than my proposal: no matter what the argument is, print
> > > > > >out its string value, and set the exit status to its integer value.
> > > > > >
> > > > > >AFAICT exit() is currently broken wrt how it handles the type of its
> > > > > >argument.
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > > --
> > > > Torben Wilson <[EMAIL PROTECTED]>
> > > > http://www.thebuttlesschaps.com
> > > > http://www.hybrid17.com
> > > > http://www.inflatableeye.com
> > > > +1.604.709.0506
> > > >
> > > >
> > > > --
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> > --
> > Torben Wilson <[EMAIL PROTECTED]>
> > http://www.thebuttlesschaps.com
> > http://www.hybrid17.com
> > http://www.inflatableeye.com
> > +1.604.709.0506
>
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