[Resolved] array_multisort problem

biggus

Hi,

I'm using array_multisort to sort my multidim array, but,when I do, I lose index 0 of my array.

say my array is:

$nodes[0]=array("id"=>"32","order"=>1);
$nodes[1]=array("id"=>"24","order"=>2);
$nodes[2]=array("id"=>"25","order"=>4);
$nodes[5]=array("id"=>"12","order"=>6);

I know I skipped $nodes[4], but that can happen when the client removes a node in the database. When I use the following:

for($i = 0; $i < sizeof($nodes); $i++){
  $sortarray[] = $nodes[$i]['id'];
}
array_multisort($sortarray,$nodes);

I lose $nodes[0] during the array_multisort. A print_r of $sortarray and $nodes (before and after the array_multisort) reveals this. I've seen others on this list implement this without problems. I ended up using $sortarray for the ids. It's a kluge, but it gets the job done. I'd rather use the original array that I've sorted, though.

Thanks,
Biggus

Installer

When I run your code I get this:

Notice: Undefined offset: 3 [I]etc.[/I]

$sortarray: 
0 => 
1 => 24
2 => 25
3 => 32

With this code:

for($i = 0; $i < sizeof($nodes); $i++) {
    if (isset($nodes[$i])) { 
        $sortarray[] = $nodes[$i]['id'];
    } else {
        $sortarray[] = '$nodes[' . $i . '] unset';
    } 
} 
array_multisort($sortarray, $nodes);

I get this:

$sortarray: 
0 => $nodes[3] unset
1 => 24
2 => 25
3 => 32

and with this code:

foreach ($nodes as $value) {
    $sortarray[] = $value['id'];
}
array_multisort($sortarray, $nodes);

I get this:

$sortarray: 
0 => 12
1 => 24
2 => 25
3 => 32

This block:

for($i = 0; $i < sizeof($nodes); $i++){ 
  $sortarray[] = $nodes[$i]['id']; 
}

fails to reach offset 5, since the size of "$nodes" is only 4, and the unset element is evaluated to null.

All three, of course, result in this for "$nodes":

$nodes: 
0 => Array
id => 12
order => 6
1 => Array
id => 24
order => 2
2 => Array
id => 25
order => 4
3 => Array
id => 32
order => 1

("array_multisort()" resets the numeric indexes.)

biggus

thanks, Installer, not sure why I didn't think of foreach. It works perfectly now.

Thanks again,
Biggus