The full data to post in a HTTP “POST” operation. To post a file, prepend a filename with @ and use the full path. This can either be passed as a urlencoded string like ‘para1=val1¶2=val2&…' or as an array with the field name as key and field data as value. If value is an array, the Content-Type header will be set to multipart/form-data.
使用数组提供 post 数据时,CURL 组件大概是为了兼容 @filename 这种上传文件的写法,默认把 content_type 设为了 multipart/form-data。虽然对于大多数服务器并没有影响,但是还是有少部分服务器不兼容。 经过一番总结最终得出结论:在没有需要上传文件的情况下,尽量对 post 提交的数据进行 http_build_query 处理,然后再发送出去,能实现更好的兼容性,更小的请求数据包。