<?
// CONNECTIONS =========================================================
$host = "localhost"; //put your host here
$user = "myuser"; //in general is root
$password = "mypassword"; //use your password here
$dbname = "mydatabase"; //your database
mysql_connect($host, $user, $password) or die("Cant connect into database");
mysql_select_db($dbname)or die("Cant connect into database");
// =============================================================================
// PROTECT AGAINST SQL INJECTION and CONVERT PASSWORD INTO MD5 formats
function anti_injection_login_senha($sql, $formUse = true)
{
$sql = preg_replace("/(from|select|insert|delete|where|drop table|show tables|,|'|#|\*|--|\\\\)/i","",$sql);
$sql = trim($sql);
$sql = strip_tags($sql);
if(!$formUse || !get_magic_quotes_gpc())
  $sql = addslashes($sql);
  $sql = md5(trim($sql));
return $sql;
}
// THIS ONE IS JUST FOR THE NICKNAME PROTECTION AGAINST SQL INJECTION
function anti_injection_login($sql, $formUse = true)
{
$sql = preg_replace("/(from|select|insert|delete|where|drop table|show tables|,|'|#|\*|--|\\\\)/i","",$sql);
$sql = trim($sql);
$sql = strip_tags($sql);
if(!$formUse || !get_magic_quotes_gpc())
  $sql = addslashes($sql);
return $sql;
}
// =============================================================================
$unityHash = anti_injection_login($_POST["myform_hash"]);
$phpHash = "hashcode"; // same code in here as in your Unity game

$nick = anti_injection_login($_POST["myform_nick"]); //I use that function to protect against SQL injection
$pass = anti_injection_login_senha($_POST["myform_pass"]);
/*
you can also use this:
$nick = $_POST["myform_nick"];
$pass = $_POST["myform_pass"];
*/
if(!$nick || !$pass) {
    echo "Login or password cant be empty.";
} else {
    if ($unityHash != $phpHash){
        echo "HASH code is diferent from your game, you infidel.";
    } else {
        $SQL = "SELECT * FROM scores WHERE name = '" . $nick . "'";
        $result_id = @mysql_query($SQL) or die("DATABASE ERROR!");
        $total = mysql_num_rows($result_id);
        if($total) {
            $datas = @mysql_fetch_array($result_id);
            if(!strcmp($pass, $datas["password"])) {
                echo "LOGADO - PASSWORD CORRECT";
            } else {
                echo "Nick or password is wrong.";
            }
        } else {
            echo "Data invalid - cant find name.";
        }
    }
}

// Close mySQL Connection
mysql_close();
?>