problem with double as array index?

From	"M. Strobel" <strobel@example.com>
Newsgroups	comp.lang.php
Subject	problem with double as array index?
Date	2015-05-06 22:25 +0200
Organization	A noiseless patient Spider
Message-ID	<midt9v$ihf$1@dont-email.me> (permalink)

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I stumbled upon this problem when trying to define a trivalent logic:

Interactive test:

php > if (! define('triFalse',0))    trigger_error('Error defining!');
php > if (! define('triMaybe',0.5))  trigger_error('Error defining!');
php > if (! define('triTrue', 1))    trigger_error('Error defining!');
php >
php > $triNotarray = array(triFalse=>triTrue, triMaybe=>triMaybe, triTrue=>triFalse);
php > var_dump($triNotarray);
array(2) {
   [0] =>
   double(0.5)
   [1] =>
   int(0)
}

Where is my Maybe value?
I was not aware of this problem (not coding PHP for some time), what is it?

Here the php -v output:

PHP 5.4.20 (cli)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
     with Xdebug v2.2.6, Copyright (c) 2002-2014, by Derick Rethans

/Str.

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problem with double as array index? "M. Strobel" <strobel@example.com> - 2015-05-06 22:25 +0200
  Re: problem with double as array index? "Christoph M. Becker" <cmbecker69@arcor.de> - 2015-05-06 22:57 +0200
  Re: problem with double as array index? adam <adam@nospam.net> - 2015-05-06 21:12 +0000
    Re: problem with double as array index? "M. Strobel" <strobel@example.com> - 2015-05-07 00:45 +0200
      Re: problem with double as array index? "Christoph M. Becker" <cmbecker69@arcor.de> - 2015-05-07 01:08 +0200
        Re: problem with double as array index? "M. Strobel" <strobel@example.com> - 2015-05-07 13:36 +0200

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