Understanding CloudFlare and PHP IP Address Logging
When using PHP's $_SERVER['REMOTE_ADDR'] to track website visitors, it's crucial to consider the use of CloudFlare for caching and security. CloudFlare proxies visitor requests, leading to the exposure of its own IP addresses rather than the actual visitor IPs.
Addressing the Issue
To obtain the accurate IP addresses of website visitors while using CloudFlare, CloudFlare provides specialized server variables. The key variable is:
Implementation
To use this variable, simply update your code as follows:
<code class="php">if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) { $_SERVER['REMOTE_ADDR'] = $_SERVER["HTTP_CF_CONNECTING_IP"]; }</code>
Additional Considerations
CloudFlare also provides other server variables, such as:
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