如何通过PHP获取并识别客户端的详细IP地址？

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pythondef get_client_ip(): if getenv(HTTP_CLIENT_IP) and getenv(HTTP_CLIENT_IP).lower() !=unknown: ip=getenv(HTTP_CLIENT_IP) elif getenv(HTTP_X_FORWARDED_FOR) and getenv(HTTP_X_FORWARDED_FOR).lower() !=unknown: ip=getenv(HTTP_X_FORWARDED_FOR) else: ip=unknown return ip

function get_client_ip() { if (getenv("HTTP_CLINET_IP") && strcasecmp(getnenv("HTTP_CLINET_IP")), "unknown") { $ip = getenv("HTTP_CLINET_IP"); } else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) { $ip = getenv("HTTP_X_FORWARDED_FOR"); } else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")){ $ip = getenv("REMOTE_ADDR"); } else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER["REMOTE_ADDR"] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) { $ip = $_SERVER["REMOTE_ADDR"]; } else { $ip = "unknown"; } return $ip; }