RE: [PHP] sorting multi-dimensional array where array elements are structs [simple class]

[Erin Fry]

Okay.  For some reason, usort messes things up when you have a multi-dimensional array 
(or at least mine).  When I commented out the call to usort, the information printed, 
but out of order.  When I called the usort, I’m not sure what happened, but all of the 
elements in my array were blank.  What I had to do is copy each row to a temporary 
array, perform the usort, then I just printed from there - I didn't even store it back 
into the original multi-dimensional array (although I'm sure I could do that if it 
were necessary).
At any rate, things are working as I need them to.  Thanks again.


-Original Message-
From: Michael Sims [mailto:[EMAIL PROTECTED]] 
Sent: Tuesday, February 11, 2003 7:19 PM
To: [EMAIL PROTECTED]
Cc: Erin Fry
Subject: Re: [PHP] sorting multi-dimensional array where array elements are structs 
[simple class]

On Tue, 11 Feb 2003 08:27:57 -0600, you wrote:

Thanks for the reply.  I had already tried usort previously.  For some
 reason, there is no data for the array fields at all in the cmp function
 - not sure why.  Does anyone know?  All help is appreciated!  Thanks.

Can you post a short code sample which illustrates your problem?

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RE: [PHP] sorting multi-dimensional array where array elements are structs [simple class]

[Erin Fry]

On Mon, 10 Feb 2003 16:23:10 -0600, you wrote:

Hi.
 
I’m working with a multidimensional array where the data in the 
array is a class (struct).  All the information is being stored correctly, 
but I need to sort each “column” (AA0, BA0, etc. – see below) 
by the fieldNo portion of the struct.
 
class fieldClass
{
var $fieldNo;
var $srcLineNo;
var $data;
}
[...]

Although I've never personally used it, I believe usort() is what you
need:

http://www.php.net/manual/en/function.usort.php

You would need to create a callback function, something like:

function cmp($a, $b) {
  if ($a-fieldNo == $b-fieldNo) { return 0; }
  return ($a-fieldNo  $b-fieldNo) ? 1 : -1;
}

usort($structArray, 'cmp');



Thanks for the reply.  I had already tried usort previously.  For some reason, there 
is no data for the array fields at all in the cmp function - not sure why.  Does 
anyone know?  All help is appreciated!  Thanks.

 

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Re: [PHP] sorting multi-dimensional array where array elements are structs [simple class]

[Michael Sims]

On Tue, 11 Feb 2003 08:27:57 -0600, you wrote:

Thanks for the reply.  I had already tried usort previously.  For some
 reason, there is no data for the array fields at all in the cmp function
 - not sure why.  Does anyone know?  All help is appreciated!  Thanks.

Can you post a short code sample which illustrates your problem?

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Re: [PHP] sorting multi-dimensional array where array elements are structs [simple class]

[Michael Sims]

On Mon, 10 Feb 2003 16:23:10 -0600, you wrote:

Hi.
 
I’m working with a multidimensional array where the data in the 
array is a class (struct).  All the information is being stored correctly, 
but I need to sort each “column” (AA0, BA0, etc. – see below) 
by the fieldNo portion of the struct.
 
class fieldClass
{
var $fieldNo;
var $srcLineNo;
var $data;
}
[...]

Although I've never personally used it, I believe usort() is what you
need:

http://www.php.net/manual/en/function.usort.php

You would need to create a callback function, something like:

function cmp($a, $b) {
  if ($a-fieldNo == $b-fieldNo) { return 0; }
  return ($a-fieldNo  $b-fieldNo) ? 1 : -1;
}

usort($structArray, 'cmp');

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