$ls_res_usr = $ls_conn->query($ls_sql);
$ls_result = $ls_res_usr->fetchAll();
foreach($ls_result AS $ls_res_usr)
{
    $id_cod= trim($ls_res_usr[0]);
    $id_cla= trim($ls_res_usr[1]);
    $id_reg= trim($ls_res_usr[2]);
    $id_con= trim($ls_res_usr[3]);
echo $id_cod . "-".$id_cla . "-".$id_reg . "-".$id_con
}
unset ($ls_res_usr);

1-1AB-La Paz-(Resource id #2)
4-3FG-La Paz-(Resource id #3)
5-1AB-Santa Cruz-(Resource id #4)
18-5TY-Oruro-(Resource id #5)
24-3wE-Sucre-(Resource id #6)