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  1. <?php
  2. $array = array(1=>10,11,12,12,12,13,13);
  3.  
  4. $arr_duplicates = array();
  5. foreach($array as $k=>$v){
  6.     $first_index = array_search($v, $array);
  7.     if($k != $first_index){
  8.         $arr_duplicates[$k] = $first_index;
  9.     }
  10. }
  11.  
  12. var_dump($arr_duplicates);
Success #stdin #stdout 0.01s 20568KB
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Standard input is empty
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array(3) {
  [4]=>
  int(3)
  [5]=>
  int(3)
  [7]=>
  int(6)
}
https://ideone.com/Kj0dUV
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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