[Solved] PHP not echo-ing

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You cannot issue Headers after the output is already sent.

            echo '<script>alert("Incorrect PassCode");</script>';
            header('Location: index.php'); // This wont work after your echo

That code Won’t work. You can change that to a JavaScript redirect

           echo '<script>
                   alert("Incorrect PassCode");
                   location.href="https://stackoverflow.com/questions/24247149/index.php";
                 </script>';

According to PHP Manual

Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP.

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solved PHP not echo-ing