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  1. <?php
  2.  
  3. $arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4);
  4.  
  5. var_dump(array_filter($arr, function($k) {
  6.     return $k == 'b';
  7. }, ARRAY_FILTER_USE_KEY));
Success #stdin #stdout #stderr 0.01s 20568KB
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stdin
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Standard input is empty
stdout
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NULL
stderr
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PHP Notice:  Use of undefined constant ARRAY_FILTER_USE_KEY - assumed 'ARRAY_FILTER_USE_KEY' in /home/pIHcPL/prog.php on line 7
PHP Warning:  array_filter() expects at most 2 parameters, 3 given in /home/pIHcPL/prog.php on line 7
https://ideone.com/YmBCIX
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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