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  1. <?php
  2.  
  3. $myArray = ['knitting needle', 'haystack', 'needlepoint'];
  4.  
  5. $search = 'needle';
  6. $keys = array_keys(
  7.     array_filter(
  8.         $myArray,
  9.         function ($value) use ($search) {
  10.             return (strpos($value, $search) !== false);
  11.         }
  12.     )
  13. );
  14.  
  15. var_dump($keys);
  16.  
Success #stdin #stdout 0.02s 24400KB
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stdin
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Standard input is empty
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array(2) {
  [0]=>
  int(0)
  [1]=>
  int(2)
}
https://ideone.com/m6RKyg
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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