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  1. <?php
  2.  
  3. //Sample application to find available values ​​in a merged collection:
  4.  
  5. function checkVacancies(array $positions) {
  6.  
  7.     $available = [];
  8.  
  9. foreach ($positions as $position => $optionAvailable) {
  10.  
  11.        $nextBox = false;
  12.         $prevBox = false;
  13.  
  14.         if (isset($positions[$position+1])) {
  15.            $nextBox = $positions[$position+1];
  16.         }
  17.         if (isset($positions[$position-1])) {
  18.            $prevBox = $positions[$position-1];
  19.         }
  20.  
  21.         if ($nextBox == false && $prevBox == false && $optionAvailable == false)  {
  22.              $available[] = $position;
  23.          }
  24.  
  25.   }
  26.      return  $available;
  27. }
  28. //false is returned position only if there is a real approximate value
  29.  
  30.  
  31. $positions = [
  32. true, //0
  33. false,
  34. false, //2
  35. false, 
  36. true,
  37. false, 
  38. false, //8
  39. false, //
  40. false
  41. ];
  42.  
  43. print_r(checkVacancies($positions));
Success #stdin #stdout 0.02s 52432KB
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stdin
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Standard input is empty
stdout
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Array
(
    [0] => 2
    [1] => 6
    [2] => 7
    [3] => 8
)
https://ideone.com/KNYZYU
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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