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<?php $arr1 = array('b304' => '304', 'b402' => '402'); $arr2 = array('b304' => '304'); print_r(array_merge_recursive($arr1, $arr2));
Output for 4.3.0 - 7.1.0
Array ( [b304] => Array ( [0] => 304 [1] => 304 ) [b402] => 402 )