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  1. <?php
  2.     $array = array(array('nome' => 'Luis', 'id' => 1), array('nome' => 'Rui', 'id' => 2));
  3.  
  4.     $nomes = array();
  5.     array_walk_recursive($array, function ($item, $key) {
  6.         global $nomes;
  7.         if ($key == 'nome') $nomes[] = $item;
  8.     });
  9.  
  10.     var_dump($nomes);
Success #stdin #stdout 0.01s 20520KB
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stdin
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array(2) {
  [0]=>
  string(4) "Luis"
  [1]=>
  string(3) "Rui"
}
https://ideone.com/cooV7X
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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