Array utils, groupByUniqueKey

~dev_rating/system/classes/Kohana/Arr.php

@@ -30,7 +30,7 @@ class Kohana_Arr {
 	 */
 	public static $delimiter = '.';
 
-    public static function groupBy($key, array &$array) {
+    public static function groupBy($key, array $array) {
         $results = [];
         foreach ($array as &$row) {
             $elem = is_object($row) ? $row->$key : $row[$key];
@@ -39,6 +39,16 @@ class Kohana_Arr {
         return $results;
     }
 
+	public static function groupByUniqueKey($key, array $array) {
+		$results = [];
+
+		foreach ($array as &$row) {
+			$results[$row[$key]] = $row;
+		}
+
+		return $results;
+	}
+
 	/**
 	 * Tests if an array is associative or not.
 	 *