Count: 6
Max value: 42
Min value: 4

    Sort: Array
(
    [0] => 4
    [1] => 8
    [2] => 15
    [3] => 16
    [4] => 23
    [5] => 42
)
 

    Reverse sort: Array
(
    [0] => 42
    [1] => 23
    [2] => 16
    [3] => 15
    [4] => 8
    [5] => 4
)

Implode: 42 * 23 * 16 * 15 * 8 * 4
Explode: Array ( [0] => 42 [1] => 23 [2] => 16 [3] => 15 [4] => 8 [5] => 4 )

15 in array?: 1
19 in array?: