"Sum of digits"

As an example, the sum of the digits of 2 to the 10th power is:

2^10 = 1024 => 1+0+2+4 => 7

What is the sum of the digits of 2^50?

Understand the math and this challenge will be easy.

Awnser:

Source:

function solution(){
   $result = pow(2, 50);
   $array = str_split($result);
   $arraysum = array_sum($array);
   echo $arraysum;
}