Community Learn Tools Library Leisure
search
English
Home > Backend Development > PHP Tutorial > $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

$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

WBOY
Release： 2016-06-23 13:28:25
Original
2450 people have browsed it

$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

Related labels：
$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
source：php.cn
Previous article：php_excel / output.php Next article：SESSION存多维数组问题
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
function_exists() cannot determine the custom function Function test () {return true;} if (function_exists ('test')) {echo "test is function...
From 2024-04-29 11:01:01
0
3
2061
How to display the mobile version of Google Chrome Hello teacher, how can I change Google Chrome into a mobile version?
From 2024-04-23 00:22:19
0
11
2222
The child window operates the parent window, but the output does not respond. The first two sentences are executable, but the last sentence cannot be implemented.
From 2024-04-19 15:37:47
0
1
1872
There is no output in the parent window document.onclick = function(){ window.opener.document.write('I am the output of the child ...
From 2024-04-18 23:52:34
0
1
1753
Where is the courseware about CSS mind mapping? Courseware
From 2024-04-16 10:10:18
0
0
1781
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template