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php function to get user IP address
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To obtain the user's real IP address, multiple HTTP headers need to be checked first. 1. The function checks the headers such as HTTP_CLIENT_IP, HTTP_X_FORWARDED_FOR, and take the first valid IP; 2. Process multiple comma-separated IPs to verify their legitimacy; 3. If all headers are invalid, use REMOTE_ADDR; 4. For CDN environments such as Cloudflare, HTTP_CF_CONNECTING_IP needs to be processed separately; 5. Note that the header information may be forged and cannot be used for security control. This method is suitable for logging and trend analysis, but cannot guarantee 100% accuracy.
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