动态|页面
WAP（无线通讯协议）是在数字移动电话、个人手持设备（PDA等）及计算机之间进行通讯的开放性全球标准。由于静态的WAP页面在很多方面不能满足用户个性化的服务请求，因此通过WAP服务器端语言产生动态的WML页面，具有很广泛的应用价值和很高的商业价值。
WAP应用结构非常类似于Internet，一个典型的WAP应用请求是这样的：首先，具有WAP用户代理功能的移动终端(WAP手机等)通过内部运行的微浏览器(Micro Browser)对某一网站以无线方式发送WAP服务请求。该请求先由WAP网关截获，对信息内容进行编码压缩，以减少网络数据流量，同时根据需要将WAP协议转换成HTTP协议，然后将处理后的请求转送到相应WAP服务器。在WAP服务器端，根据页面扩展名等性质，被请求的页面直接或由服务器端脚本解释后输出，再经网关传回用户。
从上述WAP应用流程可以看到，生成动态WAP页面与动态产生Web网页的过程非常类似。但是由于WAP应用使用的WML语言来源于语法严格的XML，因此要求输出的格式必须按WAP网页的规范输出。同时，由于WAP协议的应用范围、移动客户端的软硬件水平等特殊性，对每次输出的页面的大小、图像的格式及容量都有一定限制。下面我们以PHP脚本语言为例，看看如何动态输出WAP页面。
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