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  1. <?php
  2.  
  3. $arr = array('1','1','2','3');
  4.  
  5. $arr = array_keys(array_filter(array_count_values($arr), function($val) {
  6.     return $val === 1;
  7. }));
  8.  
  9. print_r($arr);
Success #stdin #stdout 0.01s 20520KB
comments (?)
stdin 
Standard input is empty
stdout 
Array
(
    [0] => 2
    [1] => 3
)
https://ideone.com/twtwUs
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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