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<!DOCTYPE html>
<html>
<body>
<?php
// Variable to check
$email = "john.doe@example.com";
// Remove all illegal characters from email
$email = filter_var($email, FILTER_SANITIZE_EMAIL);
// Validate e-mail
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo("$email is a valid email address");
} else {
    echo("$email is not a valid email address");
}
?> 
</body>
</html>
john.doe@example.com is a valid email address