Untitled

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Домашна работа</title>
</head>
<body>
<?php
if ($_SERVER ["REQUEST_METHOD"] == "POST") {
    $username = $_POST["username"];
    $mail = $_POST["e-mail"];
    $password = $_POST["password"];
    $height = $_POST["height"];
    $weight = $_POST ["weight"];

    function bmi ($weight, $height) {
        $height = $height * 0.01;
        $bmi = $weight / ($height*$height);
        return $bmi;
    }
    echo "Добре дошъл " . $username . "!" . "<br>" . "Твоят e-mail адрес е: " . $mail . "<br>" . "Твоята парола е: " . $password."<br>";
    echo "Твоят индекс на телесна маса е: " . bmi($weight, $height)."<br>";

    if (bmi($weight, $height) <= 18.5) {
        echo "Теглото ти е под нормата";
    }

    elseif (bmi($weight, $height) <= 24.9) {
        echo "Теглото ти е в нормата";
    }

    elseif (bmi($weight, $height) <= 29.9) {
        echo "Теглото ти е над нормата";
    }

    else {
        echo "Теглото ти е наднормено";
    }
}
?>
<form action="<?php echo htmlspecialchars($_SERVER ["PHP_SELF"]); ?>" method="POST">

    <div>
        <label for="username">Въведете име:</label><br>
        <input type="text" name="username" id="username">
    </div>
    <div>
        <label for="usermail">Въведете e-mail:</label><br>
        <input type="email" name="e-mail" id="usermail"><br>
    </div>
    <div>
        <label for="userpassword">Въведете парола:</label><br>
        <input type="password" name="password" id="userpassword">
    </div>
    <div>
        <label for="weight">Тегло в килограми:</label><br>
        <input type="number" name="weight" id="weight">
    </div>
    <div>
        <label for="height">Височина в сантиметри:</label><br>
        <input type="number" name="height" id="height">
    </div>
    <div>
        <input type="reset" value="Нулирай">
        <input type="submit" value="Изпрати">
    </div>

</form>

</body>
</html>