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<?php $myArray = array( 'a', 'b', 'c', ); array_walk_recursive( $myArray, function (&$value) { if($value == 'c'){ $value = 'Booom'; } } ); var_dump($myArray);
based on tPk3K
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(5) "Booom" }