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run code in 200+ php & hhvm versions
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<?php $myArray = [ true, ['abc', 'def', 'DDD'], false, 1, 'ghi', 2, [['HELLO', 'WORLD', true], [123, 456, false, 'false'], ], ]; array_walk_recursive( $myArray, function (&$value) { if($value == 'DDD'){ $value = 'Booom'; } if (is_bool($value)) { $value = 'I AM A BOOLEAN'; } } ); var_dump($myArray);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
array(7) { [0]=> string(5) "Booom" [1]=> array(3) { [0]=> string(3) "abc" [1]=> string(3) "def" [2]=> string(5) "Booom" } [2]=> string(14) "I AM A BOOLEAN" [3]=> int(1) [4]=> string(3) "ghi" [5]=> int(2) [6]=> array(2) { [0]=> array(3) { [0]=> string(5) "HELLO" [1]=> string(5) "WORLD" [2]=> string(5) "Booom" } [1]=> array(4) { [0]=> int(123) [1]=> int(456) [2]=> string(14) "I AM A BOOLEAN" [3]=> string(5) "false" } } }