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  1. <?php
  2.  
  3. function make_it_clean($arr) {
  4.     return array_values(array_map(
  5.         function($item) {
  6.             return $item['val'];
  7.         },
  8.         array_filter(
  9.             array_reduce(
  10.                 $arr,
  11.                 function($carry, $item) {
  12.                     if (!array_key_exists($item, $carry)) {
  13.                         $carry[$item] = [
  14.                             'val' => $item,
  15.                             'count' => 0,
  16.                         ];
  17.                     }
  18.                     $carry[$item]['count']++;
  19.  
  20.                     return $carry;
  21.                 },
  22.                 []
  23.             ),
  24.             function($item) {
  25.                 return $item['count'] === 1;
  26.             }
  27.         )
  28.     ));
  29. }
  30.  
  31. var_dump(make_it_clean(["Красный", "Желтый", "Красный", "Белый"]));
Success #stdin #stdout 0.02s 52472KB
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stdin
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Standard input is empty
stdout
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array(2) {
  [0]=>
  string(12) "Желтый"
  [1]=>
  string(10) "Белый"
}
https://ideone.com/WBOtdK
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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