Sum of Array Elements Using Recursion in PHP

Let's now not output the elements of the array to the screen, but find the sum of the elements of this array:

php<?php
  function getSum($arr) {
    $sum = array_shift($arr);
    
    if (count($arr) !== 0) {
      $sum += getSum($arr);
    }
    
    return $sum;
  }
  
  var_dump(getSum([1, 2, 3]));
?>

php<?php
  $arr = ['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5];
?>