$con = mysqli_connect("localhost", "xxxxx", "xxxxx", "xxxxx");
$ usuario = $ _POST ["usuario"]; $ contrasena = $ _POST ["contrasena"];
$statement = mysqli_prepare($con, "SELECT * FROM usuarios WHERE usuario = ? AND contrasena = ?");
mysqli_stmt_bind_param($statement, "ss", $usuario, $contrasena);
mysqli_stmt_execute($statement);
mysqli_stmt_store_result ($ Statement); mysqli_stmt_bind_result (оператор $, $ userID, $ nombre, $ email, $ usuario, $ contrasena);
$response = array();
$response["success"] = false;
while(mysqli_stmt_fetch($statement)){
$response["success"] = true;
$response["nombre"] = $nombre;
$response["email"] = $email;
$response["usuario"] = $usuario;
$response["contrasena"] = $contrasena;
}
echo json_encode($response);