ACS.php

<?php
    /*
        ACS (Account Creation Server) v1.0 by Berzerker

        Rules:
        -Usernames may not have special characters
        -Passwords have no limitations
        -The app itself checks if a username is already taken

        Packet Format:
        <packet>
            <username>Username</username>
            <password>Password</password>
        </packet>
    */

    //Start connect to MySQL database
    $servername = "SERVER NAME"; //Change this
    $usernameSQL = "USERNAME"; //Change this
    $passwordSQL = "PASSWORD"; //Change this
    $conn = new mysqli($servername, $usernameSQL, $passwordSQL);
    //End connect to MySQL database

    $packetRecieved=$_POST["messagePacket"]; //Recieves the message from the app
    $xmlUnparsed=new SimpleXMLElement($packetRecieved);

    //Start XML parsing
    $xmlUsername=$xmlUnparsed->username;
    $xmlPassword=$xmlUnparsed->password;
    //End XML parsing

    //Start sanatizing input
    $sanatizedUsername=filter_var($xmlUsername, FILTER_SANITIZE_STRING);
    $sanatizedPassword=filter_var($xmlPassword, FILTER_SANITIZE_STRING);
    //End sanatizing input

    //Start add account to database
    $username=$sanatizedUsername;
    $password=$sanatizedPassword;

    $getNewestId="SELECT LAST(id) FROM accounts;";
    $id=$getNewestId+1;
    $sqlUpdate="INSERT INTO accounts (id,username,password) VALUES ('$id','$username','$password');";
?>