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Re: A little tip [message #177447 is a reply to message #177446]

Fri, 30 March 2012 18:18

Shelly[1]
Messages: 16
Registered: March 2012

Karma:

Junior Member

On 3/30/2012 1:20 PM, Jerry Stuckle wrote:
> On 3/30/2012 1:02 PM, Shelly wrote:
>> Here is something I jist came across, so I am passing it on:
>> ==========
>> $val= TRUE;
>> $val &= TRUE;
>> print ($val === TRUE) ? "Triple is true\n" : "Triple is false\n";
>> print ($val == TRUE) ? "Double is true\n" : "Double is false\n";
>>
>> Results in:
>> Triple is false
>> Double is true
>> ==========
>>
>> Who designed that? It is totally counter-intuitive.
>>
>
> Yes, just another problem with PHP. After the second assignment, $val is
> actually a reference to TRUE. However, a variable should not be able to
> reference a constant. For instance, what would the following do?
>
> $val &= TRUE;
> $val = 3;
>
> Are we setting TRUE to 3 (that's what a reference should do, after all).
>
> This is why other languages don't allow references to constants.

Huh? How is it a reference? I wrote

$val = TRUE;

That sets TRUE as the value contained in the location specified by the
variable $val.

Then I wrote

$val &= TRUE;

which is identical to

$val = $val && TRUE;

isn't it, which should put into the location of $val the resulting value
of the logical operation of TRUE AND TRUE -- which SHOULD be TRUE.
Instead, it is something other than FALSE or ZERO, but not === to TRUE.

Your answer seems to be as if I had written

$val = &TRUE;
$val = 3;

Am I missing something here?

--
Shelly

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[Message index]

		A little tip By: Shelly[1] on Fri, 30 March 2012 17:02
		Re: A little tip By: Jerry Stuckle on Fri, 30 March 2012 17:20
		Re: A little tip By: Shelly[1] on Fri, 30 March 2012 18:18
		Re: A little tip By: Jerry Stuckle on Fri, 30 March 2012 20:19
		Re: A little tip By: Thomas Mlynarczyk on Fri, 30 March 2012 20:30
		Re: A little tip By: Doug Miller on Fri, 30 March 2012 20:55
		Re: A little tip By: Shelly[1] on Fri, 30 March 2012 20:55
		Re: A little tip By: Jerry Stuckle on Fri, 30 March 2012 21:07
		Re: A little tip By: Jerry Stuckle on Sat, 31 March 2012 14:05
		Re: A little tip By: Shelly[1] on Sat, 31 March 2012 15:27
		Re: A little tip By: Thomas 'PointedEars' on Tue, 03 April 2012 13:52
		Re: A little tip By: Shelly[1] on Tue, 03 April 2012 14:20
		Re: A little tip By: Doug Miller on Fri, 30 March 2012 19:36
		Re: A little tip By: Jerry Stuckle on Fri, 30 March 2012 20:21
		Re: A little tip By: Doug Miller on Fri, 30 March 2012 20:52
		Re: A little tip By: Jerry Stuckle on Fri, 30 March 2012 21:08
		Re: A little tip By: Shelly[1] on Fri, 30 March 2012 21:22
		Re: A little tip By: Mr. B-o-B on Fri, 30 March 2012 23:00
		Re: A little tip By: Scott Johnson on Sat, 31 March 2012 03:33
		Re: A little tip By: Shelly[1] on Fri, 30 March 2012 21:20
		Re: A little tip By: Thomas 'PointedEars' on Tue, 03 April 2012 13:56
		Re: A little tip By: Shelly[1] on Tue, 03 April 2012 14:20
		Re: A little tip By: Michael Fesser on Sat, 31 March 2012 03:04
		Re: A little tip By: Jerry Stuckle on Sat, 31 March 2012 03:31
		Re: A little tip By: Scott Johnson on Sat, 31 March 2012 03:35
		Re: A little tip By: Jerry Stuckle on Sat, 31 March 2012 03:53
		Re: A little tip By: Doug Miller on Sat, 31 March 2012 11:58
		Re: A little tip By: Jerry Stuckle on Sat, 31 March 2012 13:05
		Re: A little tip By: alvaro.NOSPAMTHANX on Mon, 02 April 2012 07:42
		Re: A little tip By: M. Strobel on Mon, 02 April 2012 08:22
		Re: A little tip By: Shelly[1] on Mon, 02 April 2012 12:15
		Re: A little tip By: M. Strobel on Mon, 02 April 2012 12:27
		Re: A little tip By: Shelly[1] on Mon, 02 April 2012 13:40
		Re: A little tip By: M. Strobel on Mon, 02 April 2012 21:43

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