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$IP = $_SERVER['REMOTE_ADDR']获取IP的原理是什么？HTTP头信息里并没有这个字段啊

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Release： 2016-06-23 13:28:25
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$IP = $_SERVER['REMOTE_ADDR']获取IP的原理是什么？HTTP头信息里并没有这个字段啊


回复讨论(解决方案)

他是将 tcp/ip 数据包中的 ip 提取出来供你参考的

他是将 tcp/ip 数据包中的 ip 提取出来供你参考的

他是将 tcp/ip 数据包中的 ip 提取出来供你参考的


也就是说他是发生在TCP握手的时候，属于网络层的东西？

对！

REMOTE_ADDR 是 CGI 环境变量

知道原因了，多谢一楼

知道原因了，多谢一楼

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$IP = $_SERVER['REMOTE_ADDR']获取IP的原理是什么？HTTP头信息里并没有这个字段啊
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