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run code in 200+ php & hhvm versions
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<?php $foo = array('a'=>1, 'b'=>'2'); var_dump(array_merge_recursive($foo,array('b'=>'c','c'=>33)));
based on DWW5I
Output for 4.3.0 - 7.2.0
array(3) { ["a"]=> int(1) ["b"]=> array(2) { [0]=> string(1) "2" [1]=> string(1) "c" } ["c"]=> int(33) }