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Re: Doubt regarding an array of references... [message #177510 is a reply to message #177509]

Tue, 03 April 2012 12:15

M. Strobel
Messages: 386
Registered: December 2011

Karma:

Senior Member

Am 03.04.2012 14:03, schrieb Jerry Stuckle:
> On 4/3/2012 7:39 AM, M. Strobel wrote:
>>
>> My 2¢:
>>
>> The problem with the counted for-loop is tedious writing, and off-by-one error.
>>
>
> No error if you remember what you're doing. They can be tedious, but allow more
> control over the loop. The real problem here is the indicies must be integers and
> sequential.
>
> OTOH, foreach() loops process the elements in the order they were added to the array,
> which is not necessarily numeric order, i.e.

Very true, and very apparent when you mix numeric and alphanumeric keys. For me this
is a feature.

>
>> The problem with the foreach-loop is: don't forget to use the key when you want to
>> change values!
>>
>> This works:
>>
>> #--------------------------------
>> strobel@s114-intel:~> php -a
>> Interactive shell
>>
>> php> $a = array(1,2,3);
>> php> foreach ($a as $k=>$v) { $a[$k]++; }
>> php> var_dump($a);
>> array(3) {
>> [0]=>
>> int(2)
>> [1]=>
>> int(3)
>> [2]=>
>> int(4)
>> }
--cut--
>>
>> I see references in PHP as "a can of worms", in PHP5 they are only necessary in very
>> special cases.
>>
>> /Str.
>>
>
> References are very handy - and prevent the need for such gyrations as you're going
> through.
>
> I find this much easier to understand:
>
> $a = array(1,2,3);
> foreach ($a as &$v) {
> $v++;
> }

Yeah, this looks clear to me. Anyway I would advice any beginner to stay away from
references in the first place.

Especially with all this old PHP4 code in the wild you get on the wrong track.

/Str.

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[Message index]

		Doubt regarding an array of references... By: Leonardo Azpurua on Mon, 02 April 2012 16:17
		Re: Doubt regarding an array of references... By: alvaro.NOSPAMTHANX on Tue, 03 April 2012 09:02
		Re: Doubt regarding an array of references... By: M. Strobel on Tue, 03 April 2012 11:39
		Re: Doubt regarding an array of references... By: Jerry Stuckle on Tue, 03 April 2012 12:03
		Re: Doubt regarding an array of references... By: M. Strobel on Tue, 03 April 2012 12:15
		Re: Doubt regarding an array of references... By: M. Strobel on Wed, 04 April 2012 08:48

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