From 4b15b8729939d1a05173ca5fd3915f63211792d8 Mon Sep 17 00:00:00 2001
From: John Blackbourn <johnbillion@git.wordpress.org>
Date: Thu, 3 Mar 2016 03:22:54 +0000
Subject: [PATCH] Revert r36811.

git-svn-id: https://develop.svn.wordpress.org/trunk@36812 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/vars.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/wp-includes/vars.php b/src/wp-includes/vars.php
index c903101997..d894884c48 100644
--- a/src/wp-includes/vars.php
+++ b/src/wp-includes/vars.php
@@ -120,9 +120,17 @@ $is_iis7 = $is_IIS && intval( substr( $_SERVER['SERVER_SOFTWARE'], strpos( $_SER
 /**
  * Test if the current browser runs on a mobile device (smart phone, tablet, etc.)
  *
+ * @staticvar bool $is_mobile
+ *
  * @return bool
  */
 function wp_is_mobile() {
+	static $is_mobile = null;
+
+	if ( isset( $is_mobile ) ) {
+		return $is_mobile;
+	}
+
 	if ( empty($_SERVER['HTTP_USER_AGENT']) ) {
 		$is_mobile = false;
 	} elseif ( strpos($_SERVER['HTTP_USER_AGENT'], 'Mobile') !== false // many mobile devices (all iPhone, iPad, etc.)