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  1. <?php
  2.  
  3. $arr = ['2015', '2015', '2012', '2013', '2014', '2014', '2016'];
  4.  
  5. $res = array_keys(array_filter(array_count_values($arr), function($v){
  6.    return $v == 1;
  7. }));
  8.  
  9. print_r($res);
Success #stdin #stdout 0.02s 24212KB
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stdin
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Standard input is empty
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Array
(
    [0] => 2012
    [1] => 2013
    [2] => 2016
)
https://ideone.com/Vud85x
language:
PHP (php 7.3.5)
created:
3 years ago
visibility:
public

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