php ip判断地区

<?php
// 假设我们有一个IP地址库文件ipdb.txt，每行格式为：IP地址|国家|城市
function getIpLocation($ip) {
    $file = 'ipdb.txt';
    if (!file_exists($file)) {
        return 'IP地址库文件不存在';
    }

    $ip = ip2long($ip);
    $lines = file($file);
    foreach ($lines as $line) {
        list($startIp, $country, $city) = explode('|', trim($line));
        $startIp = ip2long($startIp);
        $endIp = ip2long(substr($startIp, 0, -4)) + pow(256, (strlen($startIp) - 4));

        if ($ip >= $startIp && $ip <= $endIp) {
            return "国家: $country, 城市: $city";
        }
    }
    return '未知地区';
}

$ip = $_SERVER['REMOTE_ADDR'];
echo getIpLocation($ip);
?>

<?php
function getIpLocationByApi($ip) {
    $apiKey = 'your_api_key'; // 替换为你的API密钥
    $url = "https://api.iplocation.net/?ip=$ip&key=$apiKey";

    $response = file_get_contents($url);
    if ($response === false) {
        return '无法获取IP地址信息';
    }

    $data = json_decode($response, true);
    if (isset($data['country_name']) && isset($data['city'])) {
        return "国家: {$data['country_name']}, 城市: {$data['city']}";
    }
    return '未知地区';
}

$ip = $_SERVER['REMOTE_ADDR'];
echo getIpLocationByApi($ip);
?>