setting_db/index.php

<?php
if (file_exists('../config/setting.php')) {
    include "../config/setting.php";
    $koneksi = new mysqli($host,$user,$pass,$db);
    if ($koneksi->connect_error) {
        unlink('../config/setting.php');
        header("location: setting_db/");
    }else {
        echo "Anda Sudah Pernah Menyettingnya Jika Ingin Menyetting Ulang Maka Hapus Database dan File setting.php ";
    }
}else {
?>

<title>Setting Database</title>
<link href="assets/bootstrap.min.css" rel="stylesheet" type="text/css">
<body style="margin:15% auto;width:250px;">
    <center>
        <form method="POST" enctype="multipart/form-data">
            <div class="form-group">
            <input class="form-control" type="text" name="a" value="localhost">
            </div>
            <div class="form-group">
            <input class="form-control" type="text" name="b" placeholder="username">
            </div>
            <div class="form-group">
            <input class="form-control" type="text" name="c" placeholder="password">
            </div>
            <div class="form-group">
            <input class="form-control" type="text" name="d" placeholder="database">
            </div>
            <div class="form-group">
            <input class="form-control" type="submit" name="input" value="Save">
            </div>
        </form>
    </center>
</body>
<?php
if (isset($_POST['input'])) {
file_put_contents('../config/setting.php',
'<?php
$host = "'.htmlspecialchars($_POST['a']).'";
$user = "'.htmlspecialchars($_POST['b']).'";
$pass = "'.htmlspecialchars($_POST['c']).'";
$db = "'.htmlspecialchars($_POST['d']).'";
?>'
);
header("location: install.php");
}
?>

<?php
}
?>