头部信息 User-Agent
'header'=>'Content-type: application/x-www-form-urlencoded'."". 'User-Agent : post test'."".'Content-length: '.strlen($post_string)+8,
请解释一下，上面这句话的意思
我知道的是 表单提交的时候加密 内容长度不低于8字节
回复讨论(解决方案)
1.application/x-www-form-urlencoded就是一种表达提交的方式,该方式是采用urlencode的,也就是说,提交的数据都是经过加密的,服务器端需要decode才能正确获得数据。
2.User-Agent：用户代理是指浏览器,它的信息包括硬件平台、系统软件、应用软件和用户个人偏好
3.content-length：内容长度，strlen($post_string)+8，表示post的字符串长度+8，即最小也有8。
Content-type 编码方式 在这里是 application/x-www-form-urlencoded 提交的数据被编码为名称/值对
Content-length 数传输数据的大小 就是post数据的长度
如果是post请求 就必须要指定Content-type 和 Content-length
User-Agent 是用户代理 就是浏览器 如我的是chrome 用户代理“Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36” 你在这里是乱填的
strlen($post_string) 即可 不知+8干啥
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