diff --git a/get_oauth_token.php b/get_oauth_token.php
index 89aa3aaa..c2e20095 100644
--- a/get_oauth_token.php
+++ b/get_oauth_token.php
@@ -140,5 +140,5 @@ if (!isset($_GET['code'])) {
     );
     // Use this to interact with an API on the users behalf
     // Use this to get a new access token if the old one expires
-    echo 'Refresh Token: ' . $token->getRefreshToken();
+    echo 'Refresh Token: ', $token->getRefreshToken();
 }
diff --git a/src/PHPMailer.php b/src/PHPMailer.php
index b2c10e42..21b462bc 100644
--- a/src/PHPMailer.php
+++ b/src/PHPMailer.php
@@ -779,18 +779,17 @@ class PHPMailer
                     preg_replace('/[\r\n]+/', '', $str),
                     ENT_QUOTES,
                     'UTF-8'
-                )
-                . "<br>\n";
+                ), "<br>\n";
                 break;
             case 'echo':
             default:
                 //Normalize line breaks
                 $str = preg_replace('/\r\n?/ms', "\n", $str);
-                echo gmdate('Y-m-d H:i:s') . "\t" . str_replace(
+                echo gmdate('Y-m-d H:i:s'), "\t", str_replace(
                     "\n",
                     "\n                   \t                  ",
                     trim($str)
-                ) . "\n";
+                ), "\n";
         }
     }
 
diff --git a/src/POP3.php b/src/POP3.php
index a987dec1..9f9d814c 100644
--- a/src/POP3.php
+++ b/src/POP3.php
@@ -327,7 +327,7 @@ class POP3
     {
         $response = fgets($this->pop_conn, $size);
         if ($this->do_debug >= 1) {
-            echo "Server -> Client: $response";
+            echo 'Server -> Client: ', $response;
         }
         return $response;
     }
@@ -343,7 +343,7 @@ class POP3
     {
         if ($this->pop_conn) {
             if ($this->do_debug >= 2) { //Show client messages when debug >= 2
-                echo "Client -> Server: $string";
+                echo 'Client -> Server: ', $string;
             }
             return fwrite($this->pop_conn, $string, strlen($string));
         }
diff --git a/src/SMTP.php b/src/SMTP.php
index afbaf4c1..f7eb902a 100644
--- a/src/SMTP.php
+++ b/src/SMTP.php
@@ -231,21 +231,21 @@ class SMTP
                 break;
             case 'html':
                 //Cleans up output a bit for a better looking, HTML-safe output
-                echo gmdate('Y-m-d H:i:s') . ' ' . htmlentities(
+                echo gmdate('Y-m-d H:i:s'), ' ', htmlentities(
                     preg_replace('/[\r\n]+/', '', $str),
                     ENT_QUOTES,
                     'UTF-8'
-                ) . "<br>\n";
+                ), "<br>\n";
                 break;
             case 'echo':
             default:
                 //Normalize line breaks
                 $str = preg_replace('/(\r\n|\r|\n)/ms', "\n", $str);
-                echo gmdate('Y-m-d H:i:s') . "\t" . str_replace(
+                echo gmdate('Y-m-d H:i:s'), "\t", str_replace(
                     "\n",
                     "\n                   \t                  ",
                     trim($str)
-                ) . "\n";
+                ), "\n";
         }
     }