TalkPHP - View Single Post - Build multi-dimensional array out of a flat array

drewbee · 05-28-2008, 01:01 AM

Hi All,

I am having some issues doing this. I think the only way to accomplish this is to use a recursive function, however I am failing miserably.

Basically, I need to turn a flat array into a multi-dimensional array.

The flat arrays *values* need to become the new *keys* to the multi-dimensional array.

The array I feed to it can have 1 value in it, up to nth high.
Example:

PHP Code:


			
// Starts out as
$array = array(0 => '0',
                       1 => '15',
                       2 => '32',
                       3 => '18');

// Is turned into
$array = array('0' => 
                                array('15' =>
                                                    array('32' =>
                                                                         array('18' => array()
                                                                                 )
                                                            )
                                        )
                      );

As I said though, my attempts have failed with all kinds of unknown indexes and the like.

PHP Code:


			
    function recursiveBuildArray($array, &$temp)
    {
        if (isset($array['0']))
        {
            $temp[$array['0']] &= array();
            $id = $array['0'];
            unset($array['0']);
            $this->recursiveBuildArray($array[$id], &$temp);
        }
        else
        {
            return false;
        }
    }

Any help on this one?

05-28-2008, 01:01 AM	#1 (permalink)
drewbee The Acquainted Join Date: May 2008 Posts: 175 Thanks: 9	Build multi-dimensional array out of a flat array Hi All, I am having some issues doing this. I think the only way to accomplish this is to use a recursive function, however I am failing miserably. Basically, I need to turn a flat array into a multi-dimensional array. The flat arrays values need to become the new keys to the multi-dimensional array. The array I feed to it can have 1 value in it, up to nth high. Example: PHP Code: // Starts out as $array = array(0 => '0', 1 => '15', 2 => '32', 3 => '18'); // Is turned into $array = array('0' => array('15' => array('32' => array('18' => array() ) ) ) ); As I said though, my attempts have failed with all kinds of unknown indexes and the like. PHP Code: `function recursiveBuildArray($array, &$temp) { if (isset($array['0'])) { $temp[$array['0']] &= array(); $id = $array['0']; unset($array['0']); $this->recursiveBuildArray($array[$id], &$temp); } else { return false; } }` Any help on this one?