ID: 17763
Updated by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
Status: Assigned
Bug Type: Documentation problem
Operating System: all
PHP Version: 4.2.1
Assigned To: jmcastagnetto
New Comment:
Well, I think I'd agree with "nested array" and "multi-dimensional
array".
As for supporting the behaviour, this may (or may not!) be what you're
looking for:
In FORTRAN 9x if you declare a 2-dimensional array as:
INTEGER, DIMENSION(2:5, 3:10) :: values
then you can refer to (for example):
values(2,:) ! retrieve first row
values(:,3) ! retrieve first column
Similarly, in Algol68 you can declare:
[2:5, 3:10] INT values;
and refer to:
values[2,] # retrieve first row #
values[,3] # retrieve first column #
I'm not sure, however, if any of this is relevant, since both these
examples of column-slicing apply to multi-dimensional arrays;
personally, I wouldn't *expect* this kind of functionality with nested
arrays, simply because they are arrays *of* arrays, and not monolithic
multi-dimensioned ones. (In Algol68, it is also possible to declare an
"array of arrays", but, from my dim, distant and exceedingly imperfect
memory, I don't think you can "column"-slice those in the same way!)
Cheers!
Mike
Previous Comments:
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[2002-07-01 10:43:52] [EMAIL PROTECTED]
You are right, "multi-dimensional matrix" is propably a more precise
term of what I meant.
I don't know of a language that supports this behavior in their
*native* array support and I don't have any example C code which can
implement such constructs.
------------------------------------------------------------------------
[2002-06-18 10:22:23] [EMAIL PROTECTED]
Assigning to myself, while waiting for feedback
------------------------------------------------------------------------
[2002-06-17 18:24:53] [EMAIL PROTECTED]
Of the scripting languages I've used (Perl, Awk, Python), as well as
some programming langs, usually what you call 'nested array' is
referred to a 'multi-dimensional array' (sometimes interchangeably).
What you are call 'multi-dimensional array' I would think more of a
'multi-dimensional matrix', which is a totally different concept, and
no language I know supports such a structure like that natively.
SciPython has support for matrices, and so do some Java libs, etc.
If you know of a language that supports the behavior you point of in
their *native* array support, I would like to learn. It will be even
more usefule if you got some example C code which can implement such
constructs, a patch to php4/ext/standard/array.[ch] will be the
ultimate "good thing".
Waiting for feedback
------------------------------------------------------------------------
[2002-06-14 09:41:46] [EMAIL PROTECTED]
Hello
I think the term "multi-dimensional array" might be misleading for some
people. Wouldn't "nested array" be more precise?
Look at the following sample:
$myArray = array(
"A"=>Array("1"=>"test","2"=>"test","3"=>"test"),
"B"=>Array("1"=>"test","2"=>"test","3"=>"test"),
"C"=>Array("1"=>"test","2"=>"test","3"=>"test"));
In this sample I can "unset($myArray["B"])" which deletes a elements
associated with the key "B", but there is no function to delete all
elements which are associated with the key "2" in one step. I have to
go through all the elements of the ABC-Array and delete each
"2"-Element seperatly.
In a multi-dimensional array you could delete (and add)Elements in both
dimensions without having to loop through the nested arrays.
PS: I very much like the way PHP organizes Arrays, don't change it. It
is just the term that confuses me.
With Regards
Kristian
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