《PHP核心技术与最佳实践》-Web服务的实现模式
PHP支持两种WEB服务模式：WSDL和non-WSDL,为便于理解，先介绍Web服务的两种实现模式：
契约先行模式（Contract First）
代码先行模式（Code First）
契约先行模式：首要工作是定义针对这个WEB服务接口的WSDL（Web Services Description Language，网页服务描述语言）文件。WSDL文件中描述了WEB服务的位置、可提供的操作集以及其他属性。WSDL文件也就是WEB服务的“契约”。“契约”订立之后，再据此进行服务器端和客户端的应用程序开发。这种模式对应WSDL模式。
WSDL文件包括5部分：Types,Message,ProtType,Binding,Service.
Types:类型定义独立于语言，对应于SOAP消息中要传输的元素信息的定义。
Message:每个WEB方法对应两个Message定义in和out，而Message的定义包含头和体。
PortType:每个WebService对应一个PortType,其中又包含了对其发布的方法、操作。
Bindings:指定PortType中每个操作（类以及方法）的绑定消息，包含input和output消息的格式。
Service:每个WebService绑定的port消息。
某个 WSDL 文档的简化的片段：
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