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  1. <?php
  2.  
  3. $a = array("15", "4", "3", "2");
  4. $start = array_shift($a);
  5. $result = array_reduce(
  6.     $a,
  7.     function($current, $value) {
  8.         return $current - $value;
  9.     },
  10.     $start
  11. );
  12.  
  13. echo $result;
  14.  
Success #stdin #stdout 0.02s 52480KB
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6
https://ideone.com/Wl2YNx
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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