Display message before redirect to other page

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You can’t do it that way. PHP header must sent out before any content, so the correct order is:

header("location: login6.php");
echo "Please Log In First";

But these codes will redirect instantly and wouldn’t let you see the content.
So I would do the redirection by JavaScript:

echo "Please Log In First";
echo "<script>setTimeout(\"location.href="http://www.example.com";\",1500);</script>";

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