How do I determine or retrieve visitor's IP address using PHP server side programming under Unix/Windows operating systems?
Use the following environment variables to get visitor's IP address:
No Proxy detection
REMOTE_ADDR - Get the remote client IP address
Use the following environment variables to get visitor's IP address:
| Tutorial details | |
|---|---|
| Difficulty | Easy (rss) |
| Root privileges | No |
| Requirements | PHP+LAMP |
| Estimated completion time | N/A |
No Proxy detection
REMOTE_ADDR - Get the remote client IP address
With Proxy detection
HTTP_X_FORWARDED_FOR - Get the proxy server IP address.
HTTP_X_FORWARDED_FOR - Get the proxy server IP address.
PHP getenv() function
Use php getenv() function to read the value of the environment. The syntax is:
Use php getenv() function to read the value of the environment. The syntax is:
getenv('VAR-NAME-HERE')
Example: Sample code to get an IP address
Here is the PHP code:
<html> <head> <title>What is my IP address?</title> </head> <body> <?php if (getenv('HTTP_X_FORWARDED_FOR')) { $pipaddress = getenv('HTTP_X_FORWARDED_FOR'); $ipaddress = getenv('REMOTE_ADDR'); echo "Your Proxy IP address is : ".$pipaddress. "(via $ipaddress)" ; } else { $ipaddress = getenv('REMOTE_ADDR'); echo "Your IP address is : $ipaddress"; } ?> </body> </html>
If GEOIP database installed and configured using Apache/Nginx/Lighttpd, try the following php code to get the visitors country name:
$country = getenv('GEOIP_COUNTRY_NAME'); echo "Your country : $country";
You can try the demo by visiting this url.
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