From 0148602a913212e30dc62180b985a7d8272ea530 Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@users.mediawiki.org>
Date: Thu, 6 Jul 2006 17:09:10 +0000
Subject: [PATCH] * (bug 6560) Avoid PHP notice when trimming ISBN whitespace

---
 RELEASE-NOTES       | 2 ++
 includes/Parser.php | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index c5eb4fdacb..2bacc078f4 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -649,6 +649,8 @@ Some default configuration options have changed:
 * (bug 6570) Update to Indonesian localisation (id) #26
 * Added Telugu translation (te)
 * Update to Catalan translation (ca)
+* (bug 6560) Avoid PHP notice when trimming ISBN whitespace
+
 
 == Compatibility ==
 
diff --git a/includes/Parser.php b/includes/Parser.php
index a533464d87..31976baf23 100644
--- a/includes/Parser.php
+++ b/includes/Parser.php
@@ -3405,7 +3405,7 @@ class Parser
 			}
 
 			$isbn = $blank = '' ;
-			while ( ' ' == $x{0} ) {
+			while ( $x !== '' && ' ' == $x{0} ) {
 				$blank .= ' ';
 				$x = substr( $x, 1 );
 			}
-- 
2.20.1