https://api.parse.com/1/login?username="+username+"&password="+password

http://myadress.com/login.php

<?php

class ConnectionInfo {
public $conn;
public function GetConnection() {

  $this->conn = mysqli_connect("serv", "user","pass", "db") or die(mysqli_error($mysql_pekare));

 }

}

$connectionInfo = new ConnectionInfo();
$connectionInfo->GetConnection();

if (!$connectionInfo->conn)
{
echo 'No Connection';

}

else
{
    $query = 'SELECT * FROM  users ORDER BY objectId';

    $stmt = mysqli_query($connectionInfo->conn, $query);

    if (!$stmt)
    {
        echo 'Query failed';
    }

    else
    {
        $contacts = array();

        while ($row = mysqli_fetch_array($stmt))
        {

        $contact = array("ID" => utf8_encode  ($row['objectId']),
                         "Username" => utf8_encode  ($row['username']),
                         "Password" => $row['password']);

            array_push($contacts, $contact);

        }

        echo json_encode(array('results' => $contacts), JSON_PRETTY_PRINT);

    }
}

?>