$dbusername = "root";  // enter database username, I used "arduino" in step 2.2
$dbpassword = "qonita84";  // enter database password, I used "arduinotest" in step 2.2
$server = "localhost"; // IMPORTANT: if you are using XAMPP enter "localhost", but if you have an online website enter its address, ie."www.yourwebsite.com"

// Connect to your database

$dbconnect = mysqli_connect($server, $dbusername, $dbpassword);
$dbselect = mysql_select_db("LTKA",$dbconnect);

// Prepare the SQL statement

$sql = "INSERT INT LTKA.angkot (RFID_ID, Saldo, KM) VALUES ('".$_GET["ID"]."','".$_GET["sisa"]."','".$_GET["naik"]."')";

// Execute SQL statement

mysql_query($sql);

?>

localhost is currently unable to handle this request.
HTTP ERROR 500

<?php
phpinfo();
>?