The next important feature to take advantage of when migrating from PHP V4 to V5 is support for contract programming through interfaces and abstract classes and methods.
从PHP V 4迁移到PHP v5时要利用的下一个重要特性是支持通过接口、抽象类和方法进行契约编程。
Implement standard OOP features like private constructors, abstract methods and classes.
实现标准的面向对象功能，比如：私有构造函数、抽象方法和抽象类等。
The TypeDescription class is just an abstract base class with methods defined for dealing with three kinds of types: primitives, arrays, and instances of classes.
TypeDescription类只是个抽象基类，其中定义了处理三种类型的方法：原生类型、数组和类实例。
The Template Method pattern defines the skeleton of an algorithm in a base class, using abstract methods and overriding to defer individual details to child classes.
TemplateMethod模式定义了基类算法的骨架，使用了抽象方法和覆盖将具体细节放到子类中。
You can see abstract classes and abstract methods as a sort of contract.
你可以看到抽象类和抽象方法作为一种合同。
The view segments of the pipeline are abstract base classes or interfaces that provide the host and the add-in with a view of the methods that they share, as defined by the contract.
管线的检视区段为抽象基底类别或介面，可根据合约的内容，为主应用程序和增益集提供其共用的方法检视。
You can override methods, rename identifiers, refactor parameters, and implement interfaces and abstract classes.
可以重写方法、重命名标识符、重构参数，以及实现接口和抽象类。
You can override methods, rename identifiers, refactor parameters, and implement interfaces and abstract classes.
可以重写方法、重命名标识符、重构参数，以及实现接口和抽象类。
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