From 08c95382f7be3adfd4c1cb900f222d6da7ca4056 Mon Sep 17 00:00:00 2001
From: David Rothstein <drothstein@gmail.com>
Date: Wed, 25 Dec 2013 18:25:43 -0500
Subject: Issue #1982020 by Fabianx, FreekyMage, Cottser: Add static caching to
 drupal_html_class().

---
 includes/common.inc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/includes/common.inc b/includes/common.inc
index 9ad68eabd..903409531 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -3833,7 +3833,14 @@ function drupal_clean_css_identifier($identifier, $filter = array(' ' => '-', '_
  *   The cleaned class name.
  */
 function drupal_html_class($class) {
-  return drupal_clean_css_identifier(drupal_strtolower($class));
+  // The output of this function will never change, so this uses a normal
+  // static instead of drupal_static().
+  static $classes = array();
+
+  if (!isset($classes[$class])) {
+    $classes[$class] = drupal_clean_css_identifier(drupal_strtolower($class));
+  }
+  return $classes[$class];
 }
 
 /**
-- 
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