<?php
session_start();
require_once('config.php');
if ($_COOKIE['surveyok'] and $_SESSION['surveyok']){
  echo "The survey will be completed. Please wait the redirecting.. ";
  setcookie('surveyok',null);
  if (unset($_SESSION['surveyok']) && !$_COOKIE['surveyok']){
    header('refresh: 5; URL='.$survey_continue);
  } else {
    echo "UNSETTING ERROR (400x) - Please retry again";
  }
}
?>

<?php 

--- 
+++ 
@@ -1 +1,13 @@
-<?php 
+<?php
+session_start();
+require_once('config.php');
+if ($_COOKIE['surveyok'] and $_SESSION['surveyok']){
+  echo "The survey will be completed. Please wait the redirecting.. ";
+  setcookie('surveyok',null);
+  if (unset($_SESSION['surveyok']) && !$_COOKIE['surveyok']){
+    header('refresh: 5; URL='.$survey_continue);
+  } else {
+    echo "UNSETTING ERROR (400x) - Please retry again";
+  }
+}
+?>
Verify if the surveys will be completed