The PHP function array_reduce() takes a callback function that accepts a value carried over each iteration and the current item in the array, and reduces an array to a single value. Which code sample will sum and output the values in the provided array?

1. [ ]
   1 <?php
   2 echo array_reduce([1, 2, 5, 10, 11], function ($item, $carry) {
   3 $carry = $carry + \$item;
   4 });
   5?>
2. [ ]
   1 <?php
   2 echo array_reduce([1, 2, 5, 10, 11], function ($carry, $item) {
   3 return $carry = $item + \$item;
   4 });
   5?>
3. [ ]
   1 <?php
   2 array_reduce([11 2, 5, 10, 11], function ($item, $carry) {
   3 echo $carry + $item;
   4 });
   5?>
4. [X]
   1 <?php –CORRECT
   2 echo array_reduce([1, 2, 5, 10, 11], function ($carry, $item) {
   3 return $carry += $item;
   4 });
   5?>

Correct Answer:

• [x]
  1 <?php –CORRECT
  2 echo array_reduce([1, 2, 5, 10, 11], function ($carry, $item) {
  3 return $carry += $item;
  4 });
  5?>