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PHP arithmetic operations upon two numbers

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<?php
echo "WELCOME TO PHP!";
?>

OR

<html>
<head>
<title>MESSAGE</title>
</head>
<body>
<?php
echo "WELCOME TO PHP!";
?>
</body>
</html>

OR

<?php
echo "<html><head><title>MESSAGE</title></head><body>WELCOME TO PHP!</body></html>";
?>

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