X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/41578db67d72562346e4dbb2a14889b23d522813..refs/tags/wordpress-4.3:/wp-includes/vars.php

diff --git a/wp-includes/vars.php b/wp-includes/vars.php
index 996d1738..828fbbb4 100644
--- a/wp-includes/vars.php
+++ b/wp-includes/vars.php
@@ -10,7 +10,7 @@
  * servers with known pretty permalink capability.
  *
  * Note: Though Nginx is detected, WordPress does not currently
- * generate rewrite rules for it. See http://codex.wordpress.org/Nginx
+ * generate rewrite rules for it. See https://codex.wordpress.org/Nginx
  *
  * @package WordPress
  */
@@ -118,13 +118,16 @@ $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.)
  *
- * @return bool true|false
+ * @staticvar bool $is_mobile
+ *
+ * @return bool
  */
 function wp_is_mobile() {
-	static $is_mobile;
+	static $is_mobile = null;
 
-	if ( isset($is_mobile) )
+	if ( isset( $is_mobile ) ) {
 		return $is_mobile;
+	}
 
 	if ( empty($_SERVER['HTTP_USER_AGENT']) ) {
 		$is_mobile = false;