Untitled

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>First Steps Into PHP</title>

</head>
<body>
    <form>
        X: <input type="text" name="num1" />
		Y: <input type="text" name="num2" />
        Z: <input type="text" name="num3" />
		<input type="submit" />
    </form>
    <?php
    if (isset($_GET['num1']) && isset($_GET['num2']) && isset($_GET['num3'])){
        $n1 = intval($_GET['num1']);
        $n2 = intval($_GET['num2']);
        $n3 =intval($_GET['num3']);
        $numbers = [$n1, $n2, $n3];


        function count_negatives(array $numbers){
            $i = 0;
            foreach ($numbers as $x){
                if ($x < 0){
                    $i++;
                }
            }
            return $i;
        }
        if (count_negatives($numbers) % 2 == 0 ){
            echo "Positive";
        }
        if (count_negatives($numbers) % 2 != 0 && in_array("0", $numbers, false)){
                echo "Negative";
        }
        if (in_array("0", $numbers, true)){
            echo "Positive";
        }
    }
    ?>
</body>
</html>