string(37) "laibin-xaxyjgchyyxgs01.b2b.ksrank.com"

array(4) {
  [0] => string(22) "laibin-xaxyjgchyyxgs01"
  [1] => string(3) "b2b"
  [2] => string(6) "ksrank"
  [3] => string(3) "com"
}

array(2) {
  [0] => string(6) "laibin"
  [1] => string(15) "xaxyjgchyyxgs01"
}