API 接口，通过百度开放平台api接口获取目标IP地理位置信息并返回json数据

通过百度开放平台api接口获取目标IP地理位置信息并返回json数据，做这个的原因是百度官方接口返回的数据太乱了，简化了以下，只保留重要信息，我将此接口部署到了我的API 平台，相关文档：https://api.itwk.cc/doc/get_location.html，需要的话大家可以直接拿来用，里面有详细说明。

php代码：

header('Content-Type: application/json; charset=utf-8');

$ip = $_GET["ip"] ?? "";
if (empty($ip)) {
    echo json_encode(['code' => 1, 'error' => 'IP Address Not Found!']);
    return;
}

if (!filter_var($ip, FILTER_VALIDATE_IP)) {
    $ip = gethostbyname($ip);

    if (!filter_var($ip, FILTER_VALIDATE_IP)) {
        echo json_encode(['code' => 2, 'error' => 'Invalid IP Address!']);
        return;
    }
}

$url = "http://opendata.baidu.com/api.php?query={$ip}&resource_id=6006&oe=utf8";
$data = json_decode(file_get_contents($url), true);

if (!isset($data['data']) || empty($data['data'])) {
    echo json_encode(['code' => 3, 'error' => 'Failed to Get IP Address Info!']);
    return;
}

$location = $data['data'][0]['location'] ?? "";
$city = $data['data'][0]['city'] ?? "";
$isp = $data['data'][0]['isp'] ?? "";

// 分离省份和城市
if (strpos($location, " ") !== false) {
    [$province, $location] = explode(" ", $location, 2);
    $city = str_replace($province, "", $location);
} else {
    $province = $location;
}

// 去掉省份和城市中的运营商信息
$province = preg_replace('/\s*(电信|移动|联通)/', '', $province);
$city = preg_replace('/\s*(电信|移动|联通)/', '', $city);

$result = [
    'code' => 0,
    'ip' => trim($ip),
    'location' => trim($province . $city),
    'isp' => trim($isp)
];

echo json_encode($result, JSON_UNESCAPED_UNICODE);