<?php
// 获取客户端IP地址的函数
function getClientIp() {
    if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    } else {
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    return $ip;
}
// 使用上述函数获取客户端IP地址
$clientIp = getClientIp();
echo "客户端IP地址： " . $clientIp;
?>