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Re: illegal offset problem [message #184039 is a reply to message #184038]

Tue, 03 December 2013 14:55

Robert Heller
Messages: 60
Registered: December 2010

Karma:

Member

At Tue, 03 Dec 2013 14:16:38 +0000 Paul Herber <paul(at)pherber(dot)com> wrote:

>
> On Tue, 3 Dec 2013 09:00:50 -0500, richard <noreply(at)example(dot)com> wrote:
>
>>
>> foreach ($six0 as $item){
>>
>> $year=$six0[$item]['year'];
>> echo $year;
>>
>>
>> }
>>
>> If $item is an illegal offset, then what is the proper way to retrieve the
>> value of a 2d array?
>
> RTFM
> http://us1.php.net/manual/en/language.types.array.php
>
> There is an example of foreach with a 2D array halfway down the page.
> FFS.

Note: *technically* PHP (like C and all of the other C-like languages) does
not have multi-dimensional arrays (in the sense FORTRAN's multi-dimensional
arrays). (Using OO coding it is possible to create true multi-dimensional
array as a new class, typically by allocating a 1D block of memory and
overloading the () or [] operators.) Instead, it can have an array of arrays
(in C it would be an array of pointers), which 'fakes' 2 (or more) dimensional
arrays. So the correct code for the above would be (the foreach does the array
element dereferencing automatically):

foreach ($six0 as $item){
$year=$item['year'];
echo $year;
}

OR (more verbosely, getting the keys (indexes) explicity)

foreach ($six0 as $itemkey => $item) {
$year=$six0[$itemkey]['year']; /* $item IS $six0[$itemkey]! */
echo $year;
}

>
>
>

--
Robert Heller -- 978-544-6933 / heller(at)deepsoft(dot)com
Deepwoods Software -- http://www.deepsoft.com/
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[Message index]

		illegal offset problem By: Mr Oldies on Tue, 03 December 2013 14:00
		Re: illegal offset problem By: Paul Herber on Tue, 03 December 2013 14:16
		Re: illegal offset problem By: Robert Heller on Tue, 03 December 2013 14:55
		Re: illegal offset problem By: Mr Oldies on Tue, 03 December 2013 15:04
		Re: illegal offset problem By: Mr Oldies on Tue, 03 December 2013 22:25
		Re: illegal offset problem By: Ben Bacarisse on Tue, 03 December 2013 23:06
		Re: illegal offset problem By: Robert Heller on Tue, 03 December 2013 23:16
		Re: illegal offset problem By: Denis McMahon on Tue, 03 December 2013 23:46
		Re: illegal offset problem By: Mr Oldies on Tue, 03 December 2013 22:39
		Re: illegal offset problem By: Denis McMahon on Tue, 03 December 2013 21:10
		Re: illegal offset problem By: Richard Yates on Wed, 04 December 2013 20:13

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