Re: OT: and even in Dart .........Re: simple session question

From	"Peter H. Coffin" <hellsop@ninehells.com>
Newsgroups	comp.lang.php
Subject	Re: OT: and even in Dart .........Re: simple session question
Date	2011-11-05 15:00 -0500
Organization	A noiseless patient Spider
Message-ID	<slrnjbb5ed.hbg.hellsop@nibelheim.ninehells.com> (permalink)
References	(8 earlier) <j7ujt7$260$3@news.albasani.net> <j7ukg7$3fi$1@news.albasani.net> <2t2bn8-n38.ln1@luuk.invalid.lan> <ld3bn8-n88.ln1@luuk.invalid.lan> <j7uov3$d1o$1@news.albasani.net>

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On Sat, 22 Oct 2011 16:54:11 +0100, The Natural Philosopher wrote:
> Luuk wrote:
>> On 22-10-2011 17:08, Luuk wrote:
>>> On 22-10-2011 16:37, The Natural Philosopher wrote:
>>>> The Natural Philosopher wrote:
>>>>> Luuk wrote:
>>>>>> On 22-10-2011 01:32, The Natural Philosopher wrote:
>>>>>>> try $foo=($foo++);
>>>>>>>
>>>>>>> But actually, why not just
>>>>>>>
>>>>>>> $foo+=1;
>>>>>>
>>>>>> Because they differ?
>>>>>>
>>>>>> $ php -r ' $foo=0; $foo=$foo++; print $foo."\n";'
>>>>>> 0
>>>>>> $ php -r ' $foo=0; $foo=($foo++); print $foo."\n";'
>>>>>> 0
>>>>>
>>>>> That is surely a bug..
>>>>>
>>>>
>>>> viz
>>>>
>>>> ~$ cat test.c
>>>> #include <stdio.h>
>>>> main()
>>>> {
>>>> int foo;
>>>> foo=0;
>>>> foo=(foo++);
>>>> printf("%d\n",foo);
>>>> }
>>>> ~$ ./test
>>>> 1
>>>>
>>>>
>>>> I thought PHP followed C operator precedence exactly..
>>>>
>>>>
>>>
>>> it seems to follow PERL
>>>
>>> $ perl -e '$foo=0; $foo=$foo++; print $foo."\n";'
>>> 0
>>> $ perl -e '$foo=0; $foo=($foo++); print $foo."\n";'
>>> 0
>>> $ perl -e '$foo=0; $foo++; print $foo."\n";'
>>> 1
>>> $
>>>
>>>
>> 
>> see: http://www.dartlang.org
>> 
>> main() {
>>   int foo=0;
>>   foo=foo++;
>>   print('First test: ${foo}');
>> 
>>   foo=0;
>>   foo=(foo++);
>>   print('Second test: ${foo}');
>> 
>>   foo=0;
>>   foo++;
>>   print('Third test: ${foo}');
>> 
>> }
>> 
>> which gives:
>> First test: 0
>> Second test: 0
>> Third test: 1
>> 
>> 
>
> still a bug in PHP where
>
> "Parentheses may be used to force precedence, if necessary. For 
> instance: (1 + 5) * 3 evaluates to 18"
>
> (from the manual)
>
> I THOUGHT the general rule was that the value of (entity) was always the 
> FINAL value after ALL internal operations had been carried out.
>
> Agreed its a crappy way to code, which is probably why no one has 
> noticed it.

The thing is that PHP is doing the right thing there. Remember that 

$foo++

is not the same as 

++$foo

The former "returns" the value PRIOR to incrementing, the latter AFTER
incrementing. Even wrapping $foo++ in parens won't change what it
returns. Don't use one when you want the other.

-- 
93. If I decide to hold a double execution of the hero and an underling
    who failed or betrayed me, I will see to it that the hero is 
    scheduled to go first.
	--Peter Anspach's list of things to do as an Evil Overlord

Thread

simple session question cerr <ron.eggler@gmail.com> - 2011-10-21 10:44 -0700
  Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-21 20:19 +0200
    Re: simple session question Jonathan Stein <jstein@image.dk> - 2011-10-21 20:51 +0200
      Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-21 22:00 +0200
        Re: simple session question Jerry Stuckle <jstucklex@attglobal.net> - 2011-10-21 16:14 -0400
          Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-22 00:50 +0200
            Re: simple session question Jerry Stuckle <jstucklex@attglobal.net> - 2011-10-21 19:05 -0400
              Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-22 15:40 +0200
                Re: simple session question Richard Damon <news.x.richarddamon@xoxy.net> - 2011-10-22 17:19 -0400
                Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-22 22:56 +0100
                Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 00:35 +0200
                Re: simple session question Tim Streater <timstreater@greenbee.net> - 2011-10-22 23:43 +0100
                Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 01:56 +0200
                Re: simple session question Richard Damon <news.x.richarddamon@xoxy.net> - 2011-10-22 19:29 -0400
                Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 01:54 +0200
                Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 02:12 +0200
                Re: simple session question Richard Damon <news.x.richarddamon@xoxy.net> - 2011-10-22 21:13 -0400
                Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-23 08:44 +0100
                Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 17:31 +0200
                Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-23 17:18 +0100
                Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 19:14 +0200
                Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-23 18:16 +0100
                Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 19:00 +0200
                Re: simple session question Richard Damon <news.x.richarddamon@xoxy.net> - 2011-10-23 15:28 -0400
                Re: simple session question Jerry Stuckle <jstucklex@attglobal.net> - 2011-10-22 23:03 -0400
                Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 19:06 +0200
                Re: simple session question Jerry Stuckle <jstucklex@attglobal.net> - 2011-10-23 14:35 -0400
            Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-22 00:32 +0100
              Re: simple session question Luuk <Luuk@invalid.lan> - 2011-10-22 12:01 +0200
                Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-22 15:27 +0100
                Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-22 15:37 +0100
                Re: simple session question Luuk <Luuk@invalid.lan> - 2011-10-22 17:08 +0200
                OT: and even in Dart .........Re: simple session question Luuk <Luuk@invalid.lan> - 2011-10-22 17:17 +0200
                Re: OT: and even in Dart .........Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-22 16:54 +0100
                Re: OT: and even in Dart .........Re: simple session question Luuk <Luuk@invalid.lan> - 2011-10-22 18:47 +0200
                Re: OT: and even in Dart .........Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-22 19:34 +0200
                Re: OT: and even in Dart .........Re: simple session question Norman Peelman <npeelmandog@cfl.rr.com> - 2011-10-22 16:08 -0400
                Re: OT: and even in Dart .........Re: simple session question Jerry Stuckle <jstucklex@attglobal.net> - 2011-10-22 16:28 -0400
                Re: OT: and even in Dart .........Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 01:39 +0200
                Re: OT: and even in Dart .........Re: simple session question Norman Peelman <npeelmandog@cfl.rr.com> - 2011-10-22 22:40 -0400
                Re: OT: and even in Dart .........Re: simple session question Jerry Stuckle <jstucklex@attglobal.net> - 2011-10-22 23:05 -0400
                Re: OT: and even in Dart .........Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-22 22:52 +0100
                Re: OT: and even in Dart .........Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 01:25 +0200
                Re: OT: and even in Dart .........Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-23 08:41 +0100
                Re: OT: and even in Dart .........Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 00:56 +0200
                Re: OT: and even in Dart .........Re: simple session question Norman Peelman <npeelmandog@cfl.rr.com> - 2011-10-22 22:52 -0400
                Re: OT: and even in Dart .........Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 17:12 +0200
                Re: OT: and even in Dart .........Re: simple session question Tim Streater <timstreater@greenbee.net> - 2011-10-23 09:39 +0100
                Re: OT: and even in Dart .........Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-23 09:40 +0100
                Re: OT: and even in Dart .........Re: simple session question Tim Streater <timstreater@greenbee.net> - 2011-10-23 09:43 +0100
                Re: OT: and even in Dart .........Re: simple session question "Peter H. Coffin" <hellsop@ninehells.com> - 2011-11-05 15:04 -0500
                Re: OT: and even in Dart .........Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-22 22:47 +0100
                Re: OT: and even in Dart .........Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 01:22 +0200
                Re: OT: and even in Dart .........Re: simple session question The Natural Philosopher <tnp@invalid.invalid> - 2011-10-23 08:40 +0100
                Re: OT: and even in Dart .........Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-23 17:04 +0200
                Re: OT: and even in Dart .........Re: simple session question "Peter H. Coffin" <hellsop@ninehells.com> - 2011-11-05 15:00 -0500
              Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-22 15:39 +0200
    Re: simple session question cerr <ron.eggler@gmail.com> - 2011-10-21 14:43 -0700
      Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-22 00:47 +0200
      Re: simple session question Jerry Stuckle <jstucklex@attglobal.net> - 2011-10-21 19:06 -0400
    Re: simple session question cerr <ron.eggler@gmail.com> - 2011-10-21 14:17 -0700
      Re: simple session question Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-10-22 15:50 +0200
    Re: simple session question Denis McMahon <denismfmcmahon@gmail.com> - 2011-10-23 15:47 +0000

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