Online PHP editor | output for jNueF

@ 2017-01-25T21:52:37Z

<?php

function gap($g, $m, $n) {
  foreach (range($m, $n) as $num) {
    if ($isPrime = isPrime($num) && isset($firstPrime) && $num - $firstPrime == $g) {
      return [$firstPrime, $num];
    } elseif ($isPrime) {
      $firstPrime = $num;
    }
  }
  return null;
}

function isPrime($num) {
  for ($n = 2; ($div = $num/$n) > $n; $n++) {
    if (is_int($div)) {
      return false;
    }
  }
  return true;
}

var_dump(gap(2, 100, 110));

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: NULL
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 NULL

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