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  1. <?php
  2.  
  3. // your code goes here
  4.  
  5. $array =[ 
  6.   [
  7.     'col_1' => 'one',
  8.     'col_2' => 'two'
  9.   ],
  10.   [
  11.     'col_5' => 'five',
  12.     'col_3' => 'three'
  13.   ]
  14. ];
  15.  
  16. $keys = array_map(
  17. 	function ($el) { 
  18. 		return array_search('three', $el) === false? -1 : 1; 
  19. 	}, $array);
  20.  
  21. print_r($keys);
  22.  
  23. $keys = array_map(
  24.     function ($el) {
  25.         $idx = array_search('three', $el);
  26.         return $idx === false ? -1 : $idx; 
  27.     }, $array);
  28.  
  29.     print_r($keys);
  30.  
  31. $keys = array_map(
  32.     function ($el) {
  33.         $idx = array_search('three', $el);
  34.         if ($idx === false) {
  35.         	return -1;
  36.         } else {
  37.         	return array_search($idx, array_keys($el));
  38.         }
  39.     }, $array);
  40.  
  41.         print_r($keys);
  42.  $keys = array_map(
  43.     function ($el) {
  44.         return array_search('three', $el); 
  45.     }, $array);
  46.  
  47.     print_r($keys);
Success #stdin #stdout 0s 82560KB
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stdin
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Standard input is empty
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Array
(
    [0] => -1
    [1] => 1
)
Array
(
    [0] => -1
    [1] => col_3
)
Array
(
    [0] => -1
    [1] => 1
)
Array
(
    [0] => 
    [1] => col_3
)
https://ideone.com/8S6445
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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