Standard input is empty

array(3) {
  ["name_a"]=>
  array(1) {
    ["color"]=>
    array(3) {
      [0]=>
      string(3) "red"
      [1]=>
      string(5) "green"
      [2]=>
      string(4) "blue"
    }
  }
  ["name_b"]=>
  array(1) {
    ["color"]=>
    array(5) {
      [0]=>
      string(5) "green"
      [1]=>
      string(9) "tangerine"
      [2]=>
      string(5) "green"
      [3]=>
      string(4) "blue"
      [4]=>
      string(6) "yellow"
    }
  }
  ["name_c"]=>
  array(1) {
    ["color"]=>
    array(7) {
      [0]=>
      string(6) "purple"
      [1]=>
      string(4) "blue"
      [2]=>
      string(3) "red"
      [3]=>
      string(5) "green"
      [4]=>
      string(4) "blue"
      [5]=>
      string(5) "green"
      [6]=>
      string(5) "beige"
    }
  }
}