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  1. <?php
  2.  
  3. $array = array("Красный", "Желтый", "Красный", "Белый");
  4. $result = array_diff($array, array_diff_assoc($array, array_unique($array)));
  5. print_r($result);
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
(
    [1] => Желтый
    [3] => Белый
)
https://ideone.com/GCdTA1
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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