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Re: OT: and even in Dart .........Re: simple session question [message #175909 is a reply to message #175715] Sat, 05 November 2011 20:00 Go to previous messageGo to previous message
Peter H. Coffin is currently offline  Peter H. Coffin
Messages: 245
Registered: September 2010
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Senior Member
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

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