array Name Array textarea list checkbox Value Array textarea list chec

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$a= array([Name] => Array ( [0] => textarea [1] => list [2] => checkbox ) [Value] => Array ( [0] => textarea [1] => list [2] => checkbox ));
а надо получить
$b=array( [0]=>array([Name]=>textarea [Value]=>textarea) [1]=>array( [Name]=>checkbox [Value]=>checkbo)