I don't understand your different definitions: "muti-dimensional" and
"array of arrays"
>From the manual:
Multi-Dimensional Arrays
Multi-dimensional arrays are actually pretty simple. For each dimension of
the array, you add another [key] value to the end:
> Tim Ward wrote:
> <snip>
> What looks like a 2d array is fact an array of arrays (and so
> on). If it's built right this can be treated as a multi-d array in many
> ways ... but not all.
I wonder if you can help me understand this concept by giving an example of
what is possible with 1-dim arrays, but not with 3-dim arrays?
>From my point of view the only difference is writing a custom comparison
function when sorting, though this does seem logical considering the
additional complexity of multiple dimensions.
Thanks for your help.
Robert Zwink
-----Original Message-----
From: Tim Ward [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, April 24, 2001 9:54 AM
To: 'Robert V. Zwink'
Subject: RE: [PHP] Is there such an array like $array[][]?
my point was that what appear to be multi-dimensional arrays in php are not
that at all. What looks like a 2d array is fact an array of arrays (and so
on). If it's built right this can be treated as a multi-d array in many ways
... but not all.
There seem to be a lot of queries from people confused about how to deal
with arrays of arrays and this often stems from a misconception that they
are actually multi-d arrays.
Tim Ward
Senior Systems Engineer
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> -----Original Message-----
> From: Robert V. Zwink [mailto:[EMAIL PROTECTED]]
> Sent: 24 April 2001 14:33
> To: Tim Ward; [EMAIL PROTECTED]
> Subject: RE: [PHP] Is there such an array like $array[][]?
>
>
> I have used the function usort() to sort multi-dimensional
> arrays before.
> It might be a challenge to write the comparison function, but it is
> possible. I use 3-dim arrays all of the time. Makes for a
> bit cleaner code
> IMHO.
>
> I suppose one thing to consider, is that if you have an enormous 3-dim
> array, you are probably doing something wrong. Generating a
> really big
> array can be resource intense, and can slow you page down
> exponentially.
> Select only parts of the recordset, or smaller chuck of the
> file for better
> execution, but if your application requires a large 3-dim
> array, it works
> just fine for me.
>
> Robert Zwink
>
> -----Original Message-----
> From: Tim Ward [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, April 18, 2001 8:06 AM
> To: '[EMAIL PROTECTED]'
> Subject: RE: [PHP] Is there such an array like $array[][]?
>
>
> 1. there are no multi-dimensional arrays in php, just single dimension
> arrays each element of which may be an array (or any other
> variable type).
> If you make every element of an array an array of size x, you
> will get what
> can be used as a multi-dimensional array. But if you forget
> what it really
> is, you'll run into problems like expecting to be able to sort
> $array[$x][$y] by $y.
> 2. because of this you can have as many levels of an array as
> you want.
>
> try :
> $array[][][][] = "fred";
> foreach($array as $level1)
> foreach($level1 as $level2)
> foreach($level2 as $level3)
> foreach($level3 as $value)
> echo($value);
>
> Tim Ward
> Senior Systems Engineer
>
> Please refer to the following disclaimer in respect of this message:
> http://www.stivesdirect.com/e-mail-disclaimer.html
>
>
> > -----Original Message-----
> > From: Plutarck [mailto:[EMAIL PROTECTED]]
> > Sent: 17 April 2001 17:42
> > To: [EMAIL PROTECTED]
> > Subject: Re: [PHP] Is there such an array like $array[][]?
> >
> >
> > PHP can be a tad screwy with how it handles multi-dimensional
> > arrays, but
> > yes PHP handles them. No real speed problems with them either.
> >
> > But you may just want to use an associative array like:
> >
> > $loc = array("y" => $y, "x" => $x);
> >
> > Then just use $loc["y"] and $loc["x"].
> >
> > Just another option, but feel free to use multi-dimensional
> > arrays. Just be
> > aware that PHP supports only two dimensions (so $array[][][]
> > will not work),
> > and if you try and get fancy with sort() and count() you are
> > going to give
> > yourself a migraine.
> >
> >
> > --
> > Plutarck
> > Should be working on something...
> > ...but forgot what it was.
> >
> >
> > "Jack Dempsey" <[EMAIL PROTECTED]> wrote in message
> > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > yes, that's a multi-dimensional array, which is fine in php (and
> > > everything else i can think of =P)...
> > >
> > > -jack
> > >
> > > Scott Fletcher wrote:
> > > >
> > > > Hi! I am wondering if there is such a php array that can
> > take care of
> > the x
> > > > and y axis data. I figure that using this array type,
> > $axis[$x][$y]
> > would
> > > > do the trick. Would it work? If not, then education me
> > on what would
> > work!
> > > > Thanks!
> > > >
> > > > Scott
> > > >
> > > > --
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>
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