classic design books

First, the concept of factory model The factory pattern defines an interface for creating objects that the subclass determines which class to instantiate. This pattern delays the instantiation of a class to a subclass. A subclass can override an interface method to specify its own object type (abstract factory) when it is created. This pattern is useful, especially when creating an object's process assignment, such as relying on many settings files. Also, you will often see a factory method in

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PHP Classic design mode-Simple Factory modepfinalIntroducedWe were going to get an instance of a class and need to use the New keyword. But if new is written directly into the business code, a class is instantiated in many places, and if there is something wrong with this class, such as changing a name (in practice, you may be more likely to modify the constructor method), then it is awkward and needs to be