print_r(civicrm_api('setting','get',array(return => array('address_format')));

$result => array(
'is_error' => 1
'count' => 2,
'values' => array (
  1 => array(
     address_format => 'hgkdshf',
  )
  2 => array(
     address_format => 'hgyyyyshf',
  );