/**
* Get the sort order of an item in the items array.
* This function looks at the following keys:
* - **sort (numeric)**: A specific numeric sort was provided.
* - **sort array('before|after', 'key')**: You can specify that the item is before or after another item.
* - **_sort**: The order the item was added is used.
*
* @param array $item The item to get the sort order from.
* @param array $items The entire list of items.
* @param int $depth The current recursive depth used to prevent inifinite recursion.
* @return number
*/
public static function sortItemsOrder($item, $items, $depth = 0)
{
$default_sort = val('_sort', $item, 100);
// Check to see if a custom sort has been specified.
if (isset($item['sort'])) {
if (is_numeric($item['sort'])) {
// This is a numeric sort
return $item['sort'] * 10000 + $default_sort;
} elseif (is_array($item['sort']) && $depth < 10) {
// This sort is before or after another depth.
list($op, $key) = $item['sort'];
if (array_key_exists($key, $items)) {
switch ($op) {
case 'after':
return NavModule::sortItemsOrder($items[$key], $items, $depth + 1) + 1000;
case 'before':
default:
return NavModule::sortItemsOrder($items[$key], $items, $depth + 1) - 1000;
}
}
}
}
return $default_sort * 10000 + $default_sort;
}
