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Date: Wed, 22 Feb 2012 16:43:41 -0500
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Subject: RE: [PHP-DEV] [RFC] Enum proposal (yet another)
From: dsnytkine@Ultralogistics.com ("Dmitri Snytkine")


For those who keep saying "but this can already be done in php", here is =
a
pretty good article.
Long time ago enums were not available in Java also, so this article
explains that yes, thigs can technically could be done before the enum, =
and
why certain things are better with enums.

http://javarevisited.blogspot.com/2011/08/enum-in-java-example-tutorial.h=
tml

I think enums will be beneficial to php, but will add one more features =
that
people not familiar with it will have to learn about.

Dmitri Snytkine
Web Developer
Ultra Logistics, Inc.
Phone: (888) 220-4640 x 2097
Fax: (888) 795-6642
E-Mail: dsnytkine@ultralogistics.com
Web: www.ultralogistics.com

"A Top 100 Logistics I.T. Provider in 2011"


-----Original Message-----
From: Sebastian Krebs [mailto:krebs.seb@googlemail.com]=20
Sent: Wednesday, February 22, 2012 4:31 PM
To: PHP internals list
Subject: Re: [PHP-DEV] [RFC] Enum proposal (yet another)

Am 22.02.2012 22:22, schrieb =C1ngel Gonz=E1lez:
> On 22/02/12 09:37, Sebastian Krebs wrote:
>> class MyEnum {
>>      const FOO =3D 'foo';
>>      const BAR =3D 'bar';
>>      private $value;
>>      public function __construct ($value) {
>>          if (!in_array($value, array(self::FOO, self::BAR)) throw new
>> UnexpectedValueException;
>>          $this->value =3D $value;
>>      }
>>      public function __toString () { return $this->value; }
>> }
>>
>>
>> function doSomething (MyEnum $foo) { /* code */ }
>>
>>
>> What I wanted to say: I don't see, what is not possible already?
>
> I want to call it doSomething(FOO) or doSomething(MyEnum::FOO),
> not doSomething(new MyEnum(MyEnum::FOO));




// The class file
class MyEnum {
      public static $FOO;
      public static $BAR;
      const FOO =3D 'foo';
      const BAR =3D 'bar';
      private $value;
      public function __construct ($value) {
          if (!in_array($value, array(self::FOO, self::BAR)) throw new=20
UnexpectedValueException;
          $this->value =3D $value;
      }
      public function __toString () { return $this->value; }
}
/* static code block */ {
   // As long as PHP doesn't support "constant references" (;))
   // (--> constants with objects or arrays)
   MyEnum::$FOO =3D new MyEnum(MyEnum::FOO);
   MyEnum::$BAR =3D new MyEnum(MyEnum::BAR);
}
// End class file

// Somewhere deep within some other code
doSomething (MyEnum::$FOO);





However, I can't see, what is the big thing, that isn't currently not=20
possible (except any "I want"-argumentation :X)

Sidenote, according your examples above on how you want call functions:=20
Considered using normal constants?


>
> +1 for adding enums (although I'm open to variations from that exact
> proposal).
>


--=20
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