<?php
include("/../../connection.php");

if(isset($_POST["button_one"])){
    $username = $_POST['username'];
    $password = $_POST['password'];

    if($conn->multi_query("SELECT id FROM users WHERE username = '$username' OR password = '$password'")) // IF THE USER HAS A VALID USERNAME OR PASSWORD,
    {
        do {
            if ($result = $conn->store_result()) {
                while ($row = $result->fetch_row()) { // THEN ENABLE BUTTON TWO, WHICH HAS TO BE CLICKED TO DROP THE DATABASE
                    echo "
                    <script type="text/javascript">
                        document.getElementById('button_two').disabled=false;
                    </script>
                    ";
                }
                $result->free();
            }
        } while ($conn->next_result());
    }
}

if(isset($_POST["button_two"])){
    $username = $_POST['username']; // SQL INJECTION TO DROP THE DB HAPPENS HERE
    $password = $_POST['password'];

    if($conn->multi_query("SELECT id FROM users WHERE username = '$username' OR password = '$password'")) // SQL INJECTION SUCCEEDED
    {
        do {
            if ($result = $conn->store_result()) {
                while ($row = $result->fetch_row()) {
                    if ($result = $conn->query("SHOW DATABASES LIKE 'mydatabase'")) { // NO MORE DATABASE LIKE THAT, IT HAS BEEN DROPPED DUE TO THE INJECTION
                        if($result->num_rows == 0) {
                            include("another.php"); // THE PROBLEM IS HERE. EVEN THOUGH THE DB IS DROPPED, THIS PAGE IS NOT RENDERING
                        }
                    }
                }
                $result->free();
            }
        } while ($conn->next_result());
    }
}
?>