PHP greet the user according to the system time

<?php
$t = date('H');
echo "Current Time: $t<br>";
if ($t < "12")
    echo 'Good Morning!';
else if ($t >= "12" && $t <= "5")
    echo 'Good Afternoon!';
else if ($t > "5" && $t <= "7")
    echo 'Good Evening!';
else
    echo 'Good Night!';
?>

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