Hello world

Task #1

apple

pineapple

array(4) {
  [0]=>
  string(5) "apple"
  [1]=>
  string(5) "mango"
  [2]=>
  string(1) " "
  [3]=>
  array(3) {
    [0]=>
    string(8) "cucumber"
    [1]=>
    string(6) "tomato"
    [2]=>
    string(8) "zucchini"
  }
}

tomato

Task #3

10

Task #4

Отрицательное значение: -2