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Re: OT: and even in Dart .........Re: simple session question [message #175756 is a reply to message #175747]

Sun, 23 October 2011 15:04

Thomas Mlynarczyk
Messages: 131
Registered: September 2010

Karma:

Senior Member

The Natural Philosopher schrieb:
>> // $foo = 0;
>> [1] Evaluate 0 // result: 0
>> [2] Assign result of [1] to $foo // $foo = 0
>> // $foo = ($foo++);
>> [3] Evaluate operation "post-increment" on $foo // ($foo++)
>> [3.1] Set return value to current $foo // result: 0

> Why would one do that..what 'return value' is that...

It's the result of evaluating the expression $foo++. It must remember
the current value of $foo since that is what will be needed later. Why
"one" would do that? Well, PHP needs to evaluate $foo++ somehow, how
else is it supposed to work? The above algorithm is what PHP probably
does under the hood in order to produce the observed behaviour.

> You are making the side effect of lower precedence than the bracket.

No I'm not. With the above algorithm, the side effect happens well
inside the brackets, i.e. within the evaluation of $oo++ -- that's step
[3.2] below: increment $foo while still inside the evaluation routine
[3]. At that moment, $foo = 1 and "the brackets are done", returning the
evaluation result 0 in step [3.3].

> That is NEVER done.

My sketched algorithm does produce the observed result and is consistent
with the aforementioned user comment in the PHP manual.

>> [3.2] Add 1 to $foo // $foo = 1
>> [3.3] Return result // 0
>> [4] Assign result of [3] to $foo // $foo = 0

Greetings,
Thomas

--
Ce n'est pas parce qu'ils sont nombreux à avoir tort qu'ils ont raison!
(Coluche)

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[Message index]

		simple session question By: cerr on Fri, 21 October 2011 17:44
		Re: simple session question By: Thomas Mlynarczyk on Fri, 21 October 2011 18:19
		Re: simple session question By: Jonathan Stein on Fri, 21 October 2011 18:51
		Re: simple session question By: Thomas Mlynarczyk on Fri, 21 October 2011 20:00
		Re: simple session question By: Jerry Stuckle on Fri, 21 October 2011 20:14
		Re: simple session question By: Thomas Mlynarczyk on Fri, 21 October 2011 22:50
		Re: simple session question By: Jerry Stuckle on Fri, 21 October 2011 23:05
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 13:40
		Re: simple session question By: Richard Damon on Sat, 22 October 2011 21:19
		Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 21:56
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 22:35
		Re: simple session question By: Tim Streater on Sat, 22 October 2011 22:43
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 23:56
		Re: simple session question By: Richard Damon on Sat, 22 October 2011 23:29
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 23:54
		Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 00:12
		Re: simple session question By: Richard Damon on Sun, 23 October 2011 01:13
		Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 07:44
		Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 15:31
		Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 16:18
		Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 17:14
		Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 17:16
		Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 17:00
		Re: simple session question By: Richard Damon on Sun, 23 October 2011 19:28
		Re: simple session question By: Jerry Stuckle on Sun, 23 October 2011 03:03
		Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 17:06
		Re: simple session question By: Jerry Stuckle on Sun, 23 October 2011 18:35
		Re: simple session question By: The Natural Philosoph on Fri, 21 October 2011 23:32
		Re: simple session question By: Luuk on Sat, 22 October 2011 10:01
		Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 14:27
		Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 14:37
		Re: simple session question By: Luuk on Sat, 22 October 2011 15:08
		OT: and even in Dart .........Re: simple session question By: Luuk on Sat, 22 October 2011 15:17
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 15:54
		Re: OT: and even in Dart .........Re: simple session question By: Luuk on Sat, 22 October 2011 16:47
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 17:34
		Re: OT: and even in Dart .........Re: simple session question By: Norman Peelman on Sat, 22 October 2011 20:08
		Re: OT: and even in Dart .........Re: simple session question By: Jerry Stuckle on Sat, 22 October 2011 20:28
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 23:39
		Re: OT: and even in Dart .........Re: simple session question By: Norman Peelman on Sun, 23 October 2011 02:40
		Re: OT: and even in Dart .........Re: simple session question By: Jerry Stuckle on Sun, 23 October 2011 03:05
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 21:52
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 23:25
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 07:41
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 22:56
		Re: OT: and even in Dart .........Re: simple session question By: Norman Peelman on Sun, 23 October 2011 02:52
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 15:12
		Re: OT: and even in Dart .........Re: simple session question By: Tim Streater on Sun, 23 October 2011 08:39
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 08:40
		Re: OT: and even in Dart .........Re: simple session question By: Tim Streater on Sun, 23 October 2011 08:43
		Re: OT: and even in Dart .........Re: simple session question By: Peter H. Coffin on Sat, 05 November 2011 20:04
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 21:47
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 23:22
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 07:40
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 15:04
		Re: OT: and even in Dart .........Re: simple session question By: Peter H. Coffin on Sat, 05 November 2011 20:00
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 13:39
		Re: simple session question By: cerr on Fri, 21 October 2011 21:43
		Re: simple session question By: Thomas Mlynarczyk on Fri, 21 October 2011 22:47
		Re: simple session question By: Jerry Stuckle on Fri, 21 October 2011 23:06
		Re: simple session question By: cerr on Fri, 21 October 2011 21:17
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 13:50
		Re: simple session question By: Denis McMahon on Sun, 23 October 2011 15:47

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