مشکل در ارتباط با اتصال به هاست واقعی

کدهای php ایم به این صورت هستش :

می تونید از این فایل استفاده کنید

 <?php
ini_set('memory_limit', '1024M');
require_once __DIR__ . '/db_config.php';

if (isset($_REQUEST['Get_Action']) && $_REQUEST['Get_Action'] != ''
    && isset($_REQUEST['Username']) && $_REQUEST['Username'] != ''
    && isset($_REQUEST['Password']) && $_REQUEST['Password'] != '') {
    $Get_Action = $_REQUEST['Get_Action'];
    $Username = $_REQUEST['Username'];
    $Password = $_REQUEST['Password'];

    getLogin($Get_Action, $Username, $Password);
} else {
    $response["success"] = 0;
    $response["message"] = "Prams 1 is missing";
    echo json_encode($response);
    exit;
}
function getLogin($Get_Action, $Username, $Password) {
    $conn = mysqli_connect(DB_SERVER, DB_USER, DB_PASSWORD, DB_DATABASE);
    if (mysqli_connect_error()) {
        $response["success"] = -2;
        $response["message"] = "Database connect error";
        echo json_encode($response);
        exit();
    }
    mysqli_set_charset($conn, "utf8");

    if ($Get_Action == 'getuser') {
        $tsql = "SELECT * FROM tbl_user  WHERE tbl_user.user_username = '$Username' AND tbl_user.user_password = '$Password'";
    } else {
        $response["success"] = 0;
        $response["message"] = "Prams 2 is missing";
        echo json_encode($response);
        exit;
    }

    $result = $conn->query($tsql);

    if ($result->num_rows > 0) {
        // output data of each row
        while ($row = $result->fetch_assoc()) {
            $record = array();
            $record["user_id"] = $row["user_id"];
            $record["user_fullname"] = $row["user_fullname"];
            $record["user_username"] = $row["user_username"];
            $record["user_password"] = $row["user_password"];
            $record["user_phone"] = $row["user_phone"];
            $record["user_email"] = $row["user_email"];
            $record["user_type"] = $row["user_type"];
           
            $Userlist[] = $record;
        }
        $response["success"] = 1;
        $response["Userlist"] = $Userlist;
        echo json_encode($response);
    } else {
        $response["success"] = -1;
        $response["message"] = "No User found.";
        echo json_encode($response);
    }
    $conn->close();
}

?>

فایل db_config.php

 <?php
define('DB_USER', ''); // db user
define('DB_PASSWORD', ''); // db password
define('DB_DATABASE', ''); // db name  
define('DB_SERVER', 'localhost'); // db server
?>