From 7f99ac07d38fd367d1f5f85693ae8433738f7f94 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Thu, 31 Oct 2013 22:38:39 +0100
Subject: [PATCH] Only serialize things if needed

---
 src/Monolog/Formatter/LineFormatter.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Monolog/Formatter/LineFormatter.php b/src/Monolog/Formatter/LineFormatter.php
index 54dd08a5..daa919bf 100644
--- a/src/Monolog/Formatter/LineFormatter.php
+++ b/src/Monolog/Formatter/LineFormatter.php
@@ -50,7 +50,9 @@ class LineFormatter extends NormalizerFormatter
             }
         }
         foreach ($vars as $var => $val) {
-            $output = str_replace('%'.$var.'%', $this->convertToString($val), $output);
+            if (false !== strpos($output, '%'.$var.'%')) {
+                $output = str_replace('%'.$var.'%', $this->convertToString($val), $output);
+            }
         }
 
         return $output;