PHP Enumerations?

[Seamus M]

I can't find any info on enumerations in the PHP manual, so I assume there
is no built in way to create them. Can anyone tell me the best way to build
a simple enumeration, such as:

Enum AllItems as Integer

'First Item' = 1;
'Second Item' = 2;
:
End Enum

[Oli Filth]

Re: PHP Enumerations?

Seamus M said the following on 06/11/2005 22:40:[color=blue]
> I can't find any info on enumerations in the PHP manual, so I assume there
> is no built in way to create them. Can anyone tell me the best way to build
> a simple enumeration, such as:
>
> Enum AllItems as Integer
>
> 'First Item' = 1;
> 'Second Item' = 2;
> :
> End Enum
>[/color]

PHP does not have enumerations per se.

I guess the closest thing you could do (assuming PHP 5) is an abstract
class with constants, e.g.:

abstract class AllItems
{
const Dog = 1;
const Cat = 2;
const Ocelot = 3;
}

echo AllItems::Dog; // displays "1"


--
Oli

[Ewoud Dronkert]

Re: PHP Enumerations?

Oli Filth wrote:[color=blue]
> Seamus M said the following on 06/11/2005 22:40:[color=green]
>> I can't find any info on enumerations in the PHP manual[/color]
>
> I guess the closest thing you could do (assuming PHP 5) is an abstract
> class with constants, e.g.:
>
> abstract class AllItems
> {
> const Dog = 1;
> const Cat = 2;
> const Ocelot = 3;
> }
>
> echo AllItems::Dog; // displays "1"[/color]

Or an associative array perhaps?

$allitems = array('cat' => 1, 'dog' => 2, 'fish' => 3);
echo $allitems['cat'];

Or constants, but they are not restricted to one type or container:

define('ALL_CAT ', 1);
define('ALL_DOG ', 2);
define('ALL_FIS H', 3);
echo ALL_CAT;

--
E. Dronkert

[Dana Cartwright]

Re: PHP Enumerations?

"Ewoud Dronkert" <firstname@last name.net.invali d> wrote in message
news:iu7um1151i 46lhunv0070528r 8bdgat13a@4ax.c om...[color=blue]
> Oli Filth wrote:[color=green]
>> Seamus M said the following on 06/11/2005 22:40:[color=darkred]
>>> I can't find any info on enumerations in the PHP manual[/color][/color][/color]
[color=blue]
> Or constants, but they are not restricted to one type or container:
>
> define('ALL_CAT ', 1);
> define('ALL_DOG ', 2);
> define('ALL_FIS H', 3);
> echo ALL_CAT;[/color]

You can get closer to the 'auto-increment' characteristic of true ENUM's by:

$n = 0;
define( 'ALL_CAT', $n++ );
define( 'ALL_DOG', $n++ );
define( 'ALL_FISH', $n++ );

I suspect most C programmers, seeing the above, would say "Aha, it's an
enumeration", which is really what one is after, I think.

[Ryan Lange]

Re: PHP Enumerations?

=============== =============== =============== =============== ============
Dana Cartwright wrote:[color=blue]
> You can get closer to the 'auto-increment' characteristic of true ENUM's by:
>
> $n = 0;
> define( 'ALL_CAT', $n++ );
> define( 'ALL_DOG', $n++ );
> define( 'ALL_FISH', $n++ );
>
> I suspect most C programmers, seeing the above, would say "Aha, it's an
> enumeration", which is really what one is after, I think.[/color]

Keeping with cat=1, dog=2, and fish=3, shouldn't that be either:

$n = 1;

....or...

$n = 0;
define('ALL_CAT ', ++$n);

....etc?

- Ryan

[Dana Cartwright]

Re: PHP Enumerations?

"Ryan Lange" <cl1mh4224rd@gm ail.com> wrote in message
news:IeCdnRQmNq jgtezeRVn-pA@comcast.com. ..[color=blue]
> =============== =============== =============== =============== ============
> Dana Cartwright wrote:[color=green]
>> You can get closer to the 'auto-increment' characteristic of true ENUM's
>> by:
>>
>> $n = 0;
>> define( 'ALL_CAT', $n++ );
>> define( 'ALL_DOG', $n++ );
>> define( 'ALL_FISH', $n++ );
>>[/color][/color]
[color=blue]
> Keeping with cat=1, dog=2, and fish=3, shouldn't that be either:
>
> $n = 1;
>
> ...or...
>
> $n = 0;
> define('ALL_CAT ', ++$n);
>[/color]

C enumerations start at zero, which is why I wrote it that way. The OP
talked about enumerations, and I was staying with that spirit.