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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. $key = -1;
  17.  
  18. foreach($array as $k => $el) {
  19. 	if (array_search('three', $el) !== false) {
  20. 		$key = $k;
  21. 		break;
  22. 	}
  23. }
  24. echo $key;
Success #stdin #stdout 0.01s 82560KB
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stdin 
Standard input is empty
stdout 
1
https://ideone.com/odTCxI
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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