作为最流行的服务端语言PHP（PHP: Hypertext Preprocessor），在开发API方面，是很简单且极具优势的。API（Application Programming Interface，应用程序接口）架构，已经成为目前互联网产品开发中常见的软件架构模式，并且诞生很多专门API服务的公司，如：聚合数据、百度APIStore
先了解下 API ：
1、API 比开发 WEB 更简洁，但可能逻辑更复杂，API 只返回结果，也就是只完成数据输出，不呈现页面，
2、WEB 开发，更多的是 GET 和 POST 请求，API 还有 PUT、DELETE 请求
3、和 WEB 开发一样，首先需要一些相关的参数，这些参数，都会由客户端传过来，也许是 GET 也许是 POST，这个需要开发团队相互之间约定好，或者制定统一规范
4、有了参数，根据应用需求，完成数据处理，例如：获取用户信息、发朋友圈、发消息、一局游戏结束数据提交等等
5、数据逻辑处理完之后，返回客户端所需要用到的相关数据，例如：用户信息数组、朋友圈列表、消息状态、游戏结果数据等等，那数据是怎么返给客户端呢？常见有XML、JSON，设置相应的header并把要返回的数据直接打印出来即可
6、客户端获取到你返回的数据后，在客户端本地和用户进行交互
API接口工具
公共参数
| 名称 | 类型 | 必须 | 描述 |
|---|---|---|---|
| key | String | 是 | 调用key（必须以GET方式拼接在URL中） |
| secret | String | 是 | 调用密钥 |
| api_name | String | 是 | API接口名称（包括在请求地址中）[item_search,item_get,item_search_shop等] |
| cache | String | 否 | [yes,no]默认yes，将调用缓存的数据，速度比较快 |
| result_type | String | 否 | [json,jsonu,xml,serialize,var_export]返回数据格式，默认为json，jsonu输出的内容中文可以直接阅读 |
| lang | String | 否 | [cn,en,ru]翻译语言，默认cn简体中文 |
| version | String | 否 | API版本 |
API返回数据
{
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"num_iid": "100039621876",
"title": "理然男士有效控油洁面乳水润保湿温和洁净平衡肤质男士专研洗面奶夏季护肤品180g*2七夕情人节送礼送男友",
"desc_short": "",
"price": "109.90",
"total_price": "",
"suggestive_price": "",
"orginal_price": "189.90",
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"num": 33,
"min_num": 0,
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"brand": "理然",
"brandId": "621207",
"rootCatId": "16831",
"cid": "16840",
"created_time": "",
"modified_time": "",
"delist_time": "",
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