diff --git a/examples/code_generator.phps b/examples/code_generator.phps
index d9a4da0a..9faf7393 100644
--- a/examples/code_generator.phps
+++ b/examples/code_generator.phps
@@ -91,10 +91,8 @@ try {
                 $example_code .= "\n\$mail->Host       = \"" . $_POST['smtp_server'] . "\";";
                 $example_code .= "\n\$mail->Port       = \"" . $_POST['smtp_port'] . "\";";
                 $example_code .= "\n\$mail->SMTPSecure = \"" . strtolower($_POST['smtp_secure']) . "\";";
-                $example_code .= "\n\$mail->SMTPAuth   = " . (array_key_exists(
-                        'smtp_authenticate',
-                        $_POST
-                    ) ? 'true' : 'false') . ";";
+                $example_code .= "\n\$mail->SMTPAuth   = " .
+                    (array_key_exists('smtp_authenticate', $_POST) ? 'true' : 'false') . ";";
                 if (array_key_exists('smtp_authenticate', $_POST)) {
                     $example_code .= "\n\$mail->Username   = \"" . $_POST['authenticate_username'] . "\";";
                     $example_code .= "\n\$mail->Password   = \"" . $_POST['authenticate_password'] . "\";";
diff --git a/examples/simple_contact_form.phps b/examples/simple_contact_form.phps
index f422edcc..c5db5592 100644
--- a/examples/simple_contact_form.phps
+++ b/examples/simple_contact_form.phps
@@ -12,6 +12,7 @@ require '../vendor/autoload.php';
 if (array_key_exists('to', $_POST)) {
     $err = false;
     $msg = '';
+    $email = '';
     //Apply some basic validation and filtering to the subject
     if (array_key_exists('subject', $_POST)) {
         $subject = substr(strip_tags($_POST['subject']), 0, 255);
@@ -55,9 +56,9 @@ if (array_key_exists('to', $_POST)) {
         $mail->Host = 'localhost';
         $mail->Port = 2500;
         $mail->CharSet = 'utf-8';
-        //It's important not to use the submitter's address as the form address as it's forgery,
-        //which will cause our messages to fail SPF checks
-        //Use an address in your own domain here
+        //It's important not to use the submitter's address as the from address as it's forgery,
+        //which will cause your messages to fail SPF checks.
+        //Use an address in your own domain as the from address, put the submitter's address in a reply-to
         $mail->setFrom('contact@example.com', (empty($name)? 'Contact form': $name));
         $mail->addAddress($to);
         $mail->addReplyTo($email, $name);
diff --git a/examples/smime_signed_mail.phps b/examples/smime_signed_mail.phps
index 059d24f4..50ef0fa1 100644
--- a/examples/smime_signed_mail.phps
+++ b/examples/smime_signed_mail.phps
@@ -6,7 +6,8 @@
  *
  *
  * STEP 1 - Creating a certificate:
- * You can either use a self signed certificate, pay for a signed one or use free alternatives such as StartSSL/Comodo etc.
+ * You can either use a self-signed certificate, pay for a signed one,
+ * or use free alternatives such as StartSSL, Comodo etc.
  * Check out this link for more providers: http://kb.mozillazine.org/Getting_an_SMIME_certificate
  * In this example I am using Comodo.
  * The form is directly available via https://secure.comodo.com/products/frontpage?area=SecureEmailCertificate
diff --git a/get_oauth_token.php b/get_oauth_token.php
index 7a0ea9b5..40c46aa5 100644
--- a/get_oauth_token.php
+++ b/get_oauth_token.php
@@ -51,6 +51,7 @@ if (!isset($_GET['code']) && !isset($_GET['provider'])) {
 <a href='?provider=Yahoo'>Yahoo</a><br/>
 <a href='?provider=Microsoft'>Microsoft/Outlook/Hotmail/Live/Office365</a><br/>
 </body>
+</html>
 <?php
 exit;
 }
@@ -71,11 +72,12 @@ if (!in_array($providerName, ['Google', 'Microsoft', 'Yahoo'])) {
     exit('Only Google, Microsoft and Yahoo OAuth2 providers are currently supported in this script.');
 }
 
-//These details obtained are by setting up app in Google developer console.
+//These details are obtained by setting up an app in the Google developer console,
+//or whichever provider you're using.
 $clientId = 'RANDOMCHARS-----duv1n2.apps.googleusercontent.com';
 $clientSecret = 'RANDOMCHARS-----lGyjPcRtvP';
 
-//If this automatic URL doesn't work, set it yourself manually
+//If this automatic URL doesn't work, set it yourself manually to the URL of this script
 $redirectUri = (isset($_SERVER['HTTPS']) ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
 //$redirectUri = 'http://localhost/PHPMailer/redirect';
 
@@ -87,6 +89,7 @@ $params = [
 ];
 
 $options = [];
+$provider = null;
 
 switch ($providerName) {
     case 'Google':
@@ -111,6 +114,11 @@ switch ($providerName) {
         break;
 }
 
+if (is_null($provider)) {
+    echo 'Provider missing';
+    exit;
+}
+
 if (!isset($_GET['code'])) {
     // If we don't have an authorization code then get one
     $authUrl = $provider->getAuthorizationUrl($options);
diff --git a/src/PHPMailer.php b/src/PHPMailer.php
index 72042ea6..7c3fba07 100644
--- a/src/PHPMailer.php
+++ b/src/PHPMailer.php
@@ -1228,7 +1228,8 @@ class PHPMailer
             if ($this->has8bitChars($domain) and @mb_check_encoding($domain, $this->CharSet)) {
                 $domain = mb_convert_encoding($domain, 'UTF-8', $this->CharSet);
                 //Ignore IDE complaints about this line - method signature changed in PHP 5.4
-                if (false !== ($punycode = idn_to_ascii($domain, 0, INTL_IDNA_VARIANT_UTS46))) {
+                $errorcode = 0;
+                if (false !== ($punycode = idn_to_ascii($domain, $errorcode, INTL_IDNA_VARIANT_UTS46))) {
                     return substr($address, 0, $pos) . $punycode;
                 }
             }
diff --git a/test/fakesendmail.sh b/test/fakesendmail.sh
index c9f17a56..edf0479a 100755
--- a/test/fakesendmail.sh
+++ b/test/fakesendmail.sh
@@ -5,18 +5,18 @@
 #Create a temp folder to put messages in
 numPath="${TMPDIR-/tmp/}fakemail"
 umask 037
-mkdir -p $numPath
+mkdir -p ${numPath}
 
-if [ ! -f $numPath/num ]; then
-  echo "0" > $numPath/num
+if [ ! -f ${numPath}/num ]; then
+  echo "0" > ${numPath}/num
 fi
-num=`cat $numPath/num`
-num=$(($num + 1))
-echo $num > $numPath/num
+num=`cat ${numPath}/num`
+num=$((${num} + 1))
+echo ${num} > ${numPath}/num
 
-name="$numPath/message_$num.eml"
+name="${numPath}/message_${num}.eml"
 while read line
 do
-  echo $line >> $name
+  echo ${line} >> ${name}
 done
 exit 0