Question

Ok, so lets start with the code

<?php
function LuhnCalc($number) {
  $chars = array_reverse(str_split($number, 1));
  $odd = array_intersect_key($chars, array_fill_keys(range(1, count($chars), 2), null));
  $even = array_intersect_key($chars, array_fill_keys(range(0, count($chars), 2), null));
  $even = array_map(function($n) { return ($n >= 5)?2 * $n – 9:2 * $n; }, $even);
  $total = array_sum($odd) + array_sum($even);
  return ((floor($total / 10) + 1) * 10 – $total) % 10;
}

print LuhnCalc($_GET['num']);
?>

The errors are showing in the following lines

  $even = array_map(function($n) { return ($n >= 5)?2 * $n – 9:2 * $n; }, $even);


  return ((floor($total / 10) + 1) * 10 – $total) % 10;

The errors are

Parse error: syntax error, unexpected T_FUNCTION, expecting ‘)’ in
/home/MONKEY DO /public_html/gateway/crn.php on line 6

Answer 1

The error message says “I got a function but I expected a )“. It’s telling you that according to the grammar of the parser, the token function isn’t expected to happen at that point. When you write array_map(function(... you are passing an anonymous function by using the token function, which the compiler doesn’t like.

Anonymous functions were introduced in PHP 5.3. You’re probably running and older version of PHP. Check what version you’re running, and upgrade if you need to.