Traversing an nested array and transform some values

Question

I'm looking for a clean solution to transform a nested array.

Here is what I'm trying to achieve...

Original array:

  $map = array(
    'name' => 'super test',
    'machine_name' => 'super_test',
    'class' => 'openlayers_map_map',
    'options' => array(
      'width' => 'auto',
      'height' => '300px',
      'contextualLinks' => 1,
      'provideBlock' => 1,
      'view' => array(
        'center' => array(
          'lat' => '0',
          'lon' => '0',
        ),
        'rotation' => '0',
        'zoom' => '2',
      ),
      'layers' => array(
        '0' => array(
          'name' => 'Ma super layer',
          'machine_name' => 'plouf',
          'class' => 'openlayers_layer_tile',
          'options' => array(
            'source' => array(
              'name' => 'Ma super layer',
              'machine_name' => 'plouf',
              'class' => 'openlayers_source_osm'
            ),
            'param1' => 'ca roule'
          )
        ),
      ),
      'controls' => array(
        'control_mouseposition',
        '0' => array(
          'name' => 'Control attribution',
          'machine_name' => 'openlayers_control_attribution',
          'class' => 'openlayers_control_attribution',
          'options' => array(
            'collapsible' => 1
          )
        ),
        'control_rotate',
        'control_zoom',
      ),
      'interactions' => array(
        'interaction_doubleclickzoom',
        'interaction_dragpan',
        'interaction_dragrotateandzoom',
        'interaction_mousewheelzoom',
      ),
    )
  );

Final array:

  $map = array(
    'name' => 'super test',
    'machine_name' => 'super_test',
    'class' => 'openlayers_map_map',
    'options' => array(
      'width' => 'auto',
      'height' => '300px',
      'contextualLinks' => 1,
      'provideBlock' => 1,
      'view' => array(
        'center' => array(
          'lat' => '0',
          'lon' => '0',
        ),
        'rotation' => '0',
        'zoom' => '2',
      ),
      'layers' => array(
        '0' => (object) openlayers_layer_tile
          'name' => 'Ma super layer',
          'machine_name' => 'plouf',
          'class' => 'openlayers_layer_tile',
          'options' => array(
            'source' => (object) openlayers_source_osm
              'name' => 'Ma super layer',
              'machine_name' => 'plouf',
              'class' => 'openlayers_source_osm'
            ),
            'param1' => 'ca roule'
          )
        ),
      ),
      'controls' => array(
        'control_mouseposition',
        '0' => (object) openlayers_control_attribution
          'name' => 'Control attribution',
          'machine_name' => 'openlayers_control_attribution',
          'class' => 'openlayers_control_attribution',
          'options' => array(
            'collapsible' => 1
          )
        ),
        'control_rotate',
        'control_zoom',
      ),
      'interactions' => array(
        'interaction_doubleclickzoom',
        'interaction_dragpan',
        'interaction_dragrotateandzoom',
        'interaction_mousewheelzoom',
      ),
    )
  );

Basically, I need to traverse the array, find all children with the 'class' key and transform them into objects of the same name.

Clément Malet · Accepted Answer · 2014-09-13 19:32:53Z

If you don't have the classes ready to be instantiated, this code will create anonymous objects instead. (The class name still being present as a property.)

function class_to_object (&$arr) {

  if (is_array($arr)) {
    foreach ($arr as $key => &$val) {
      class_to_object($val);
    }

    if (isset($arr['class'])) {
      $arr = (object) $arr;
    }
  }

}

class_to_object($map);

Result :

(Notice that the first array is turned into an object, since it contains the field "class" too. I guess you can tweak the function easily enough if you don't want that behavior)

Mate Solymosi · Accepted Answer · 2014-09-13 19:22:22Z

This totally untested recursive function may get you on the right track:

function recursive_hydrate_array($arr)
{
  if(!is_array($arr) || !isset($arr["class"]))
  {
    throw new Exception("Argument is not an array or does not have a 'class' key.");
  }

  $klass = $arr["class"];
  unset($arr["class"]);

  $obj = new $klass();

  foreach($arr as $k => $v)
  {
    if(is_array($arr[$k]) && isset($arr[$k]["class"]))
    {
      $obj->{$k} = recursive_hydrate_array($arr[$k]);
    }
    else
    {
      $obj->{$k} = $arr[$k];
    }
  }

  return $obj;
}

Note that I am making three assumptions here:

The classes in question already exist.
Each class can be instantiated without passing any parameters to its constructor.
All relevant properties of each class are public and can be set from outside of the class.

Collectives™ on Stack Overflow

Traversing an nested array and transform some values

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related