[Solar-talk] another blonde array problem

[Paul M Jones]

On 03 Dec 2007, at 13:07, Jeff Surgeson wrote:

> Hi All
>
> Got this!
> array(
>    0 => array('Power Generation' => 'Using the Sun'),
>    1 => array('Power Generation' => 'Using the Wind'),
>    2 => array('Heating & Cooling' => 'Radiant Slabs'),
>    3 => array('Heating & Cooling' => 'Domestic Hot Water'),
> );
>
> Need this!
>
> array(
>    'Power Generation' => array(
>        'Using the Sun' => 'ACTION_SUN',
>        'Using the Wind' => 'ACTION_WIND',
>    ),
>    'Heating & Cooling' => array(
>        'Radiant Slabs' => 'ACTION_SLABS',
>        'Domestic Hot Water' => 'ACTION_WATER',
>    ),
> );
>
> Anyone care to put me out of my misery and do this with a few foreach
> loops? :-(

You only need one loop, I think, and then you can build a $new array  
based on the key/value pairs.  Here's a start for you:

     <?php

     $old = array(
        0 => array('Power Generation' => 'Using the Sun'),
        1 => array('Power Generation' => 'Using the Wind'),
        2 => array('Heating & Cooling' => 'Radiant Slabs'),
        3 => array('Heating & Cooling' => 'Domestic Hot Water'),
     );

     $new = array();

     foreach ($old as $item) {
         $key = key($item);
         $val = current($item);
         $new[$key][] = $val;
     }

     var_dump($new);

     /*
     array(2) {
       ["Power Generation"]=>
       array(2) {
         [0]=>
         string(13) "Using the Sun"
         [1]=>
         string(14) "Using the Wind"
       }
       ["Heating & Cooling"]=>
       array(2) {
         [0]=>
         string(13) "Radiant Slabs"
         [1]=>
         string(18) "Domestic Hot Water"
       }
     }
     */


Hope this helps.  :-)




-- pmj