"Binary Numbers"

As an example, the integer 5 is represented in binary form by 101. This means, working from right to left:

Given an input file (decimals.txt) of 500 integers, how many 1s IN TOTAL appear in the file in each numbers binary representation?

Say you had the numbers 5, 7 and 10

5 = 101
7 = 111
10 = 1010
Total number of 1s: 7

A fairly simple challenge, download the text file, convert decimals to binary, remove the 0's and count the 1's

Awnser:

Source:

include(MISC.'fn.fetch.php'); 

function solution(){
   $result = 0;
   $list = fetch('http://www.cstutoringcenter.com/problems/files/decimals.txt');
   $lines = explode("\n", $list);
   foreach($lines as $decno) {
      $binno = str_replace("0", "", decbin($decno)); // convert decimal to binary and remove 0's
	  $result += strlen($binno); // length of $binno = no of 1's
   }
   echo "= ".$result."";
}