This is refactoring is to reduce the long parameter list. Long parameter list make it hard to understand and maintain. It bring down the code's readability either. Introduce a parameter object is a natural solution to this problem. Parameter object contains numbers of get methods to get the parameter value used in other methods.
However, compared with other program languages, PHP contains the most powerful and flexible array functionality. PHP developers are temped to use array to group all necessary parameters. The good side of using array lies in simplicity. However, the downside is obvious as well. You can't guarantee array's integrity, and you need to check if a parameter is contained in an array everywhere in functions that accept this array as parameter.
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