public function sortBy($callback, $options = SORT_REGULAR, $descending = false)
{
$results = array();
if (is_string($callback)) {
$callback = $this->valueRetriever($callback);
}
// First we will loop through the items and get the comparator from a callback
// function which we were given. Then, we will sort the returned values and
// and grab the corresponding values for the sorted keys from this array.
foreach ($this->items as $key => $value) {
$results[$key] = $callback($value);
}
$descending ? arsort($results, $options) : asort($results, $options);
// Once we have sorted all of the keys in the array, we will loop through them
// and grab the corresponding model so we can set the underlying items list
// to the sorted version. Then we'll just return the collection instance.
foreach (array_keys($results) as $key) {
$results[$key] = $this->items[$key];
}
$this->items = $results;
return $this;
}
