Created
September 19, 2024 07:20
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This function retrieves the user's IP address by checking various server variables. It filters out private and reserved IP ranges to ensure only public IPs are returned. If no valid IP is found, it returns 'local'.
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| <?php | |
| /** | |
| * Get the user's IP address from various possible sources. | |
| * It filters out private and reserved IP ranges. | |
| * If no valid public IP is found, returns 'local'. | |
| * | |
| * @return string User's IP address or 'local' if not found. | |
| */ | |
| function getUserIpAddress() { | |
| // Define the list of possible IP address sources | |
| $ipSources = [ | |
| 'HTTP_CLIENT_IP', | |
| 'HTTP_X_FORWARDED_FOR', | |
| 'HTTP_X_FORWARDED', | |
| 'HTTP_X_CLUSTER_CLIENT_IP', | |
| 'HTTP_FORWARDED_FOR', | |
| 'HTTP_FORWARDED', | |
| 'REMOTE_ADDR' | |
| ]; | |
| // Iterate through the sources and return the first valid IP address | |
| foreach ($ipSources as $source) { | |
| if (!empty($_SERVER[$source])) { | |
| // If the source is HTTP_X_FORWARDED_FOR, it may contain multiple IP addresses | |
| if ($source === 'HTTP_X_FORWARDED_FOR') { | |
| $ipList = explode(',', $_SERVER[$source]); | |
| foreach ($ipList as $ip) { | |
| $ip = trim($ip); // Clean up the IP address | |
| if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) { | |
| return $ip; // Return the first valid public IP address | |
| } | |
| } | |
| } else { | |
| $ip = $_SERVER[$source]; | |
| if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) { | |
| return $ip; // Return the first valid public IP address | |
| } | |
| } | |
| } | |
| } | |
| // Return 'local' if no valid IP is found | |
| return 'local'; | |
| } | |
| // Retrieve and display the user's IP address | |
| $userIp = getUserIpAddress(); | |
| echo 'User IP Address: ' . $userIp; | |
| ?> |
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