diff --git a/core/lib/Drupal/Component/Utility/Html.php b/core/lib/Drupal/Component/Utility/Html.php
index b6eb649..d4bf13e 100644
--- a/core/lib/Drupal/Component/Utility/Html.php
+++ b/core/lib/Drupal/Component/Utility/Html.php
@@ -187,7 +187,7 @@ public static function getUniqueId($id) {
    * @see self::getUniqueId()
    */
   public static function getId($id) {
-    $id = strtr(Unicode::strtolower($id), array(' ' => '-', '_' => '-', '[' => '-', ']' => ''));
+    $id = str_replace([' ', '_', '[', ']'], ['-', '-', '-', ''], Unicode::strtolower($id));
 
     // As defined in http://www.w3.org/TR/html4/types.html#type-name, HTML IDs can
     // only contain letters, digits ([0-9]), hyphens ("-"), underscores ("_"),