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php-general | 2000071

RE: [PHP] Sorting a Two-Dimensional Array From: Christopher Thompson (ct <email protected>)
Date: 07/14/00

Manually sorting an multi dimensional array is no different a single
dimensional array. There are many sorting algorithms. Here is a simple
though not particularly fast one. This code was quickly typed in and has not
been tested.

$key = 'rating';
$n = count($array);
for($i=0; $i<$n-1; ++$i){
        for($j=$i+1; $j<$n; ++$j){
                if($array[$i][$key] > $array[$j][$key]){
                        $tmp = $array[$i];
                        $array[$i] = $array[$j];
                        $array[$j] = $tmp;
                }
        }
}

> -----Original Message-----
> From: Waldo L. Jaquith [mailto:waldo <email protected>]
> Sent: Friday, July 14, 2000 3:22 PM
> To: php-general <email protected>
> Subject: [PHP] Sorting a Two-Dimensional Array
>
>
> Folks,
>
> I've searched the archives over for this, but I can't find a
> response that's
> really pertinent to what I'm doing. I'm new at multi-dimensional
> arrays, so
> please bear with me. :)
>
> I've got an array like this:
>
> $array[1][id]
> $array[1][rating]
> $array[2][id]
> $array[2][rating]
> $array[3][id]
> $array[3][rating]
>
> I'd like to sort by rating. So if the data looked like this:
>
> $array[1][501]
> $array[1][5]
> $array[2][467]
> $array[2][1]
> $array[3][468]
> $array[3][3]
>
> I'd like to sort by rating, for it to end up looking like this:
>
> $array[2][467]
> $array[2][1]
> $array[3][468]
> $array[3][3]
> $array[1][501]
> $array[1][5]
>
> You'll note that it's now in order of 1, 3, 5, instead of 5, 1,
> 3. In SQL,
> this would be wicked easy. I could just do "ORDER BY rating". With
> two-dimensional arrays, of course, it's not so easy. I'm aware that I
> should be using usort, but I don't know how to go about applying
> it. I was
> hoping for something like "usort($array,rating,asc)", but Momma always
> called me a dreamer. :)
>
> Thanks in advance for any help you can offer, fellow PHPers.
>
> Best,
> Waldo
>
> Waldo L. Jaquith
> < waldo <email protected> >
> < 804/979.2980 >
> // Munk & Phyber
> // 110B Second Street NE
> // Charlottesville, VA 22902
>
>
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