public function pay()
{
$obj = new venta();
$p = $obj->pay($_GET['idventa']);
print_r(json_encode(array($p[0], $p[1])));
}
public function pay()
{
$obj = new venta();
$p = $obj->pay($_GET['idventa']);
print_r(json_encode(array($p[0], $p[1])));
}