X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/7f1521bf193b382565eb753043c161f4cb3fcda7..e0feb3b2e5b436a06bbb04fbc838d1cd6ec95399:/wp-includes/vars.php

diff --git a/wp-includes/vars.php b/wp-includes/vars.php
index da29cb20..828fbbb4 100644
--- a/wp-includes/vars.php
+++ b/wp-includes/vars.php
@@ -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;