WorldCat Search API
1. 申请 WSKey ： https://platform.worldcat.org/wskey/keys/request
所有APIs : https://platform.worldcat.org/api-explorer/wcapi
2. 下载php类：http://www.jaredhowland.com/OCLC/
用法：http://www.jaredhowland.com/OCLC/
项目地址：https://github.com/jaredhowland/OCLC
下载：OCLC-master
实例：
$classify = new Classify;
$data = $classify->title('Harry Potter and the Chamber of Secrets');