Standard input is empty

array(29) {
  [0]=>
  string(12) "America/Adak"
  [1]=>
  string(17) "America/Anchorage"
  [2]=>
  string(13) "America/Boise"
  [3]=>
  string(15) "America/Chicago"
  [4]=>
  string(14) "America/Denver"
  [5]=>
  string(15) "America/Detroit"
  [6]=>
  string(28) "America/Indiana/Indianapolis"
  [7]=>
  string(20) "America/Indiana/Knox"
  [8]=>
  string(23) "America/Indiana/Marengo"
  [9]=>
  string(26) "America/Indiana/Petersburg"
  [10]=>
  string(25) "America/Indiana/Tell_City"
  [11]=>
  string(21) "America/Indiana/Vevay"
  [12]=>
  string(25) "America/Indiana/Vincennes"
  [13]=>
  string(23) "America/Indiana/Winamac"
  [14]=>
  string(14) "America/Juneau"
  [15]=>
  string(27) "America/Kentucky/Louisville"
  [16]=>
  string(27) "America/Kentucky/Monticello"
  [17]=>
  string(19) "America/Los_Angeles"
  [18]=>
  string(17) "America/Menominee"
  [19]=>
  string(18) "America/Metlakatla"
  [20]=>
  string(16) "America/New_York"
  [21]=>
  string(12) "America/Nome"
  [22]=>
  string(27) "America/North_Dakota/Beulah"
  [23]=>
  string(27) "America/North_Dakota/Center"
  [24]=>
  string(30) "America/North_Dakota/New_Salem"
  [25]=>
  string(15) "America/Phoenix"
  [26]=>
  string(13) "America/Sitka"
  [27]=>
  string(15) "America/Yakutat"
  [28]=>
  string(16) "Pacific/Honolulu"
}