PHP if else语句测试api php字段是否为空

Question

我正在尝试从 ip 地理定位 api 中获取 city 属性。从 api:

返回的示例

{"as":"AS38484 Virgin Broadband VISP","city":"Adelaide","country":"Australia","countryCode":"AU","isp":"iseek Communications","lat":-27,"lon":133,"org":"iseek Communications","query":"1.178.0.144","region":"","regionName":"","status":"success","timezone":"","zip":""}

我的代码：

$query = '{"as":"AS38484 Virgin Broadband VISP","city":"Adelaide","country":"Australia","countryCode":"AU","isp":"iseek Communications","lat":-27,"lon":133,"org":"iseek Communications","query":"1.178.0.144","region":"","regionName":"","status":"success","timezone":"","zip":""}';
$query = @unserialize($query);
if($query && $query['status'] == 'success') {
    if(!empty($query['city'])) {
        $city =  $query['city'];
        // routine that uses $city gets called
    } else {
        $lat = $query['lat'];
        $lon = $query['lon'];
        // routine that uses $lat, $lon gets called
    }
}

基本上，if(!empty($query['city'])) 没有按预期运行（不是我真的知道，上周我一直在使用 PHP）。我还尝试在 if 语句之前设置 $city，然后测试 if($city != '')。

问题：没有找到条件组合然后将city属性设置为city？当没有 city 属性时，它也会跳过 else 部分并且不设置 lat/lon.

注意：city 和 lat/lon 之间的差异的原因是天气 api 我正在查询更喜欢 city 但不是每个ip可以提供一个。

谢谢

Answer 1

$query 不是序列化的 PHP 数组，如果您在 unserialize 调用之前没有使用“@”，您就会看到它。它看起来像 JSON，所以也许 json_decode 就是您要查找的内容？

Answer 2

两个问题：

1) 您需要使用 json_decode 反序列化 json 数据

2) 由于它将反序列化为一个对象，您将使用

访问字段

 $query->city;

没有

 $query['city'];

Answer 3

正如@kao3991 和@andrew 所说，您的数据是JSON 而不是序列化数组。试试这个：

$query = '{"as":"AS38484 Virgin Broadband VISP","city":"Adelaide","country":"Australia","countryCode":"AU","isp":"iseek Communications","lat":-27,"lon":133,"org":"iseek Communications","query":"1.178.0.144","region":"","regionName":"","status":"success","timezone":"","zip":""}';
$query = json_decode($query, true);
if($query && $query['status'] == 'success') {
    if(!empty($query['city'])) {
        $city =  $query['city'];
        // routine that uses $city gets called
    } else {
        $lat = $query['lat'];
        $lon = $query['lon'];
        // routine that uses $lat, $lon gets called
    }
}

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