refs #17063 [master] sort hierarchy children naturally

module/finc/src/finc/Hierarchy/TreeDataFormatter/NoCollections.php

@@ -64,4 +64,29 @@ class NoCollections extends \VuFind\Hierarchy\TreeDataFormatter\Json
         }
         return parent::pickTitle($record, $parentID);
     }
+
+
+    /**
+     * Sort Nodes
+     * Convert an unsorted array of [ key, value ] pairs into a sorted array
+     * of values.
+     *
+     * @param array $array The array of arrays to sort
+     *
+     * @return array
+     */
+    protected function sortNodes($array)
+    {
+        // Sort arrays based on first element
+        $sorter = function ($a, $b) {
+            return strnatcmp($a[0], $b[0]);
+        };
+        usort($array, $sorter);
+
+        // Collapse array to remove sort values
+        $mapper = function ($i) {
+            return $i[1];
+        };
+        return array_map($mapper, $array);
+    }
 }