connect.php

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <?php

    $server = 'localhost';
    $user = 'rangga';
    $pass = 'rangga';
    $db = 'contoh';
    $koneksi = mysqli_connect($server, $user, $pass, $db) or die(mysqli_error($koneksi));

    if ($koneksi) {
        echo "Koneksi ke database berhasil <br>";
    } else {
        "Koneksi: gagal <br>";
    }
    ?>
</body>

</html>