string(38) "haibei-sxsydlcljsdjyxgs.b2b.ksrank.com"

array(4) {
  [0] => string(23) "haibei-sxsydlcljsdjyxgs"
  [1] => string(3) "b2b"
  [2] => string(6) "ksrank"
  [3] => string(3) "com"
}

array(2) {
  [0] => string(6) "haibei"
  [1] => string(16) "sxsydlcljsdjyxgs"
}

int(6)

int(2)