$arr1: Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
)
<br>sumArray($arr1): 10<br>$arr2: Array
(
    [0] => 18.64
    [1] => 26.78
    [2] => 13.3
    [3] => 4
)
<br>sumArray($arr2): 62.72<br>$arr3: Array
(
    [0] => 64
    [1] => 88
    [2] => 7
)
<br>sumArray($arr3): 159