Sorting array in drupal 7 - arrays

Question

I am a newbie in Drupal. Please accept my ignorance. I have a page with a custom hook to override the view and display list of posts with default sorting or no sorting. I want to sort the array based on the node create date. But not sure where to plug the sorting argument. Can anyone please help? I have this code block in my_view.module file.
function _sites_by_park_page_get_node_references($fieldName, $property, $park_id) {
$results = array();
$parks = _sites_by_park_page_get_sites($park_id);
foreach ($parks['features'] as $feature) {
foreach($feature['properties'][$property] as $key => $value) {
if (!array_key_exists($key, $results)) {
$query = new EntityFieldQuery();
$query->entityCondition('entity_type', 'node');
$query->fieldCondition($fieldName, 'value', $value);
$result = $query->execute();
$node = node_load(array_shift(array_keys($result['node'])));
$results[$key] = $node->title;
}
}
}
return $results;
}
/**
* Return GeoJSON formatted park data
*/
function _sites_by_park_page_get_sites($park_id) {
// Uses a lot of memory thanks to views and GD image resizing, could use some garbage collection opimisation
ini_set('memory_limit', '512M');
$data_view = views_get_view('sites_by_park_data');
$data_view->set_arguments(array($park_id));
$data_view->execute('page');
// Build our own, more lightweight geojson structure for faster page loads (Leaflet module generated 2MB of data vs this custom module's 40kb-ish for 140 parks)
$results = array(
'type' => 'FeatureCollection',
'features' => array(),
);
foreach($data_view->result as $result) {
// Initialise some arrays that may be merged between result sets (for instance when multiple activities contribute to a site's overall data)
if (!isset($results['features'][$result->nid])) {
$results['features'][$result->nid] = array(
'type' => 'Feature',
'properties' => array()
);
}
}
$results['features'] = array_values($results['features']);
return $results;
}

Answer 1

As per MilanG's suggestion I have done this through admin section. Change the sorting order and it works fine now.