Untitled

<html>
<body>
<form method="post">
Pierwsza liczba
<input type="number" name="number1" /><br><br>
Druga liczba
<input type="number" name="number2" /><br><br>
<input  type="submit" name="submit" value="Sumuj">
</form>
<?php
    if(isset($_POST['submit']))
    {
        $number1 = $_POST['number1'];
        $number2 = $_POST['number2'];
        $sum =  $number1+$number2;
echo "Suma liczba $number1 oraz $number2 to: ".$sum;
}
?>
</body>
</html>