=> PHP level errors
bad args:
string(0) ""
HipHop Warning: Too many arguments for idn_to_ascii(), expected 4 in %s on line 7
NULL
bad variant:
bool(false)
empty domain:
bool(false)
fourth arg for 2003 variant (only notice raised):
string(7) "foo.com"
with error, but no details arg:
bool(false)
with error, with details arg:
bool(false)
array(3) {
  ["result"]=>
  string(0) ""
  ["isTransitionalDifferent"]=>
  int(1)
  ["errors"]=>
  int(16)
}
with error, with details arg, contextj:
bool(false)
array(3) {
  ["result"]=>
  string(0) ""
  ["isTransitionalDifferent"]=>
  int(1)
  ["errors"]=>
  int(4096)
}
bool(true)