Group multidimensional array elements?

duckduckgoose · Mar 14, 2009

I've been playing around with array_unique and array_shift, but not sure exactly how to use it for this particular situation, or even if it's what I should use...

Suppose my array looks like this:

Array
(
    [0] => Array
        (
            [color] => orange
            [opts] => Array
                (
                    [title] => Dracula
                )

    )

[1] => Array
    (
        [color] => orange
        [opts] => Array
            (
                [title] => Moby Dick
            )

    )

[2] => Array
    (
        [color] => gray
        [opts] => Array
            (
                [title] => Who's On First
            )

    )

I'm trying to figure out a way to group the color, but still retain the different titles. So, I suppose what I'm hoping to end up with, is this:

Array 
(
            [orange] => Array ( [0] => Dracula [1] => Who's On First )
            [grey] => Array ( [0] => Moby Dick )
)

Is there a way to do that?

NogDog · Mar 14, 2009

You could loop through the first array and populate a 2nd array from it, something like (untested):

$newArray = array();
foreach ($arr1 as $data)
{
   if (isset($data['color']))
   {
      if(!empty($data['opts']))
      {
         foreach ($data['opts'] as $key => $opt)
         {
            if ($key == 'title')
            {
               $newArray[$data['color']][] = $opt;
            }
         }
      }
   }
}