string(47) "chenghua-scscdstfxqxxjdbssq1z92h.qy.qiyanku.com"

array(4) {
  [0] => string(32) "chenghua-scscdstfxqxxjdbssq1z92h"
  [1] => string(2) "qy"
  [2] => string(7) "qiyanku"
  [3] => string(3) "com"
}

array(2) {
  [0] => string(8) "chenghua"
  [1] => string(23) "scscdstfxqxxjdbssq1z92h"
}