Write a PHP script that receive form input by the method post to check the number is prime or not

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $num = intval($_POST["number"]);
    $isPrime = $num > 1 && !array_filter(range(2, sqrt($num)), fn($i) => $num % $i == 0);
    echo "$num is " . ($isPrime ? "a Prime number." : "not a Prime number.");
}
?>

<!DOCTYPE html>
<html>
<body>
    <form method="post">
        Enter a number: <input type="number" name="number" required>
        <input type="submit" value="Check">
    </form>
</body>
</html>