将 Google Book Search 集成到 PHP 应用程序中_PHP
简介
如果您与出版业有某种联系，或者即使您只是一位热心读者，您也可能听说过 Google Books。Google Books 是 Google 致力于创建世的可搜索数字图书馆的尝试，其方法是扫描数百万本图书并使它们可以在线预览和购买。这也是 Google 最有争议的项目之一，是最近的 2009 年 11 月才结案的一个集体诉讼的焦点。
除了作为一个有趣的闲聊话题外，从开发人员角度看，Google Books 因具有 Data API 而变得有趣。该 API 允许开发人员阅读和搜索 Google Books 数据库，寻找匹配用户指定标准的图书，并在其他 Web 应用程序中使用这些搜索结果。您可以通过任何支持 XML 的开发工具包来访问这个遵循 REST 模型的 API。该 API 已经拥有针对 PHP、Java™ 和其他常用编程语言的客户端库。
本文将向您介绍 Google Book Search Data API，展示如何在自定义 PHP 应用程序中使用并集成图书搜索结果。本文包含了一些示例，展示如何通过关键字、语言和作者搜索图书，检索图书数据（包括 ISBN 编号和缩略图），对数据库中现有的图书添加评论和评分。来吧，我们现在就开始！
了解 Book Search 提要
在开始 PHP 代码之前，需要先介绍一下 Google Book Search Data API。与其它基于 REST 的服务一样，该 API 接受包含一个或多个 XML 编码输入参数的 HTTP 请求，并返回可以在任何具有 XML 意识的客户机中解析的 XML 编码响应。对于 Google Book Search Data API，响应总是包含一个 Atom 提要，它包含请求的信息。
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