public function GetClientes(){
    $execquery = $this->db->query("SELECT * FROM CLIENTES");
    $result = $execquery->fetch_all(MYSQLI_ASSOC);
    return $result;}

$resultclientes = $obj->GetClientes();
 foreach ($resultalbaranes as $row){
    $idcliente = $row['fkcliente'];
    $nombrecliente = $row['nombrecliente'];
    $emailcliente = $row['email1'];
}