API的意思是：
简单来说就是函数。比如你写了一个库，里面有很多函数，如果别人要使用你这个库，但是并不知道每个函数内部是怎么实现的。使用的人需要看你的文档或者注释，才知道这个函数的入口参数，和返回值或者这个函数，是用来做什么的。对于用户来说，你的这些函数就是API。目的是提供应用程序以及开发人员，基于某软件或硬件得以访问一组例程的能力。
API的优势在于，可以提供应用程序与开发人员基于某软件或硬件得以访问一组例程的能力，而又无需重编源码，或理解内部工作机制的细节。
通俗点来讲，就是别人已经写好了可以实现特定功能的函数，而编程人员只需要根据其提供好的接口，调用方法，传入规定的参数，然后这个函数就会帮助软件调用数据，实现功能
电商API：很多电商平台，国内的淘宝，京东，1688，拼多多，跨境电商平台：亚马逊，速卖通，LAZADA等等都有自己的API接口，方便卖家买家更方便的提供服务，增加效率。
现在很多大平台都有开放式的API。它们会制定自己的系统接口标准，当开发人员需要执行系统整合、自定义和程序应用等操作时，都可以通过该接口标准调用源代码，开发公司常提到的调用API就是这个意思。
1.注册调用APIKEY
代码如下（示例）：
-- 请求示例 url 默认请求参数已经URL编码处理curl -i "https://api-gw.……cn/taobao/item_get/?key=您自己的KEY&secret=<您自己的apiSecret>&num_iid=652874751412&is_promotion=1"
&secret=<您自己的apiSecret>&num_iid=652874751412&is_promotion=1";$curl = curl_init();curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $method);curl_setopt($curl, CURLOPT_URL, $url);curl_setopt($curl, CURLOPT_SSL_VERIFYHOST,FALSE);curl_setopt($curl, CURLOPT_SSL_VERIFYPEER,FALSE);curl_setopt($curl, CURLOPT_FAILONERROR, false);curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);curl_setopt($curl, CURLOPT_HEADER, true);curl_setopt($curl, CURLOPT_ENCODING, "gzip");var_dump(curl_exec($curl));?>调用实例
代码如下（示例）：
{ "item": { "num_iid": "520813250866", "title": "三刃木折叠刀过安检创意迷你钥匙扣钥匙刀军刀随身多功能小刀包邮", "desc_short": "", "price": 25.8, "total_price": 0, "suggestive_price": 0, "orginal_price": "25.80", "nick": "欢乐购客栈", "num": "832", "min_num": 0, "detail_url": "http://item.taobao.com/item.htm?id=520813250866", "pic_url": "//img.alicdn.com/imgextra/i4/2596264565/TB2p30elFXXXXXQXpXXXXXXXXXX_!!2596264565.jpg", "brand": "三刃木", "brandId": "4036703", "rootCatId": "50013886", "cid": "50014822", "favcount": "4824", "fanscount": "1469", "crumbs": [], "created_time": "", "modified_time": "", "delist_time": "", "desc": "小店所有产品都支持刻字，如需刻字，拍之前联系客服即可。
炎炎夏日来临，一把随身携带便携式的折叠小刀，带开瓶器功能，喝酒不用愁。（钥匙刀不带开瓶器功能）
可以当吊牌项链装饰，也可当钥匙扣挂饰， 水果刀 开瓶器 户外防身.
部分客户跟我们反映链子质量还不够好，因此小店已重新订购一批质量更好的链子赠送，加量不加价，只为让你买的更舒心，戴的更放心。
购买就送工具刀卡和链子一条
![](\"//img.alicdn.com/imgextra/i3/2596264565/TB2Sci2jXXXXXXFXpXXXXXXXXXX_!!2596264565.png\")
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超凡大师套餐包括【304不锈钢钥匙扣+GJ019C折叠刀+GJ017D工具卡】![](\"//img.alicdn.com/imgextra/i4/2596264565/TB2_uiXnFXXXXXBXXXXXXXXXXXX_!!2596264565.jpg_q90.jpg\")
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来源地址：https://blog.csdn.net/onebound_linda/article/details/130399040
