From 01264ebf315c9f194578b596ba9f626706446786 Mon Sep 17 00:00:00 2001
From: Marcus Bointon <marcus@synchromedia.co.uk>
Date: Fri, 28 Jul 2017 10:46:56 +0200
Subject: [PATCH] Take function call out of loop

---
 src/PHPMailer.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/PHPMailer.php b/src/PHPMailer.php
index f7c6205e..b2c10e42 100644
--- a/src/PHPMailer.php
+++ b/src/PHPMailer.php
@@ -3945,7 +3945,8 @@ class PHPMailer
     public function DKIM_QP($txt)
     {
         $line = '';
-        for ($i = 0; $i < strlen($txt); ++$i) {
+        $len = strlen($txt);
+        for ($i = 0; $i < $len; ++$i) {
             $ord = ord($txt[$i]);
             if (((0x21 <= $ord) and ($ord <= 0x3A)) or $ord == 0x3C or ((0x3E <= $ord) and ($ord <= 0x7E))) {
                 $line .= $txt[$i];