Untitled

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

</head>
<body>
<form>
    N: <input type="text" name="num" />
    <input type="submit" />
</form>
<?php
if (isset($_GET['num'])){
    $n = intval($_GET['num']);
    for ($i = 1; $i <= $n; $i++){
        echo "<button>$i</button>" . "<br>";

    }
}
?>
</html>