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  1. <?php
  2.  
  3. $array = array (
  4. array('name' => 'a'),
  5. array('name' => 'b'),
  6. array('name' => 'c'),
  7. array('name' => 'd'),
  8. );
  9.  
  10. $result = array_map(function($a){ return ['name' => strtoupper($a['name'])]; }, $array);
  11.  
  12. print_r($result);
Success #stdin #stdout 0s 82560KB
stdin
Standard input is empty
stdout
Array
(
    [0] => Array
        (
            [name] => A
        )

    [1] => Array
        (
            [name] => B
        )

    [2] => Array
        (
            [name] => C
        )

    [3] => Array
        (
            [name] => D
        )

)