string(33) "shandan-lzcczpyxgs.b2b.ksrank.com"

array(4) {
  [0] => string(18) "shandan-lzcczpyxgs"
  [1] => string(3) "b2b"
  [2] => string(6) "ksrank"
  [3] => string(3) "com"
}

array(2) {
  [0] => string(7) "shandan"
  [1] => string(10) "lzcczpyxgs"
}