阅读Json with features字段
阅读Json with features字段
提问于 2020-06-19 18:18:13
我有以下问题。我正在尝试读取一个Json文件，但是我没有得到想要的结果。我有以下数据。
我想要阅读功能，但在找出某个地方时有一个错误。
我在读取时收到错误信息:警告:非法字符串偏移量‘功能’
输出
Array
(
[objectIdFieldName] => OBJECTID
[uniqueIdField] => Array
(
[name] => OBJECTID
[isSystemMaintained] => 1
)
[globalIdFieldName] =>
[geometryProperties] => Array
(
[shapeAreaFieldName] => Shape__Area
[shapeLengthFieldName] => Shape__Length
[units] => esriMeters
)
[geometryType] => esriGeometryPolygon
[spatialReference] => Array
(
[wkid] => 4326
[latestWkid] => 4326
)
[fields] => Array
(
[0] => Array
(
[name] => GEN
[type] => esriFieldTypeString
[alias] => GEN
[sqlType] => sqlTypeOther
[length] => 33
[domain] =>
[defaultValue] =>
)
[1] => Array
(
[name] => cases
[type] => esriFieldTypeInteger
[alias] => Anzahl Fälle
[sqlType] => sqlTypeOther
[domain] =>
[defaultValue] =>
)
[2] => Array
(
[name] => deaths
[type] => esriFieldTypeInteger
[alias] => Anzahl Todesfälle
[sqlType] => sqlTypeOther
[domain] =>
[defaultValue] =>
)
)
[features] => Array
(
[0] => Array
(
[attributes] => Array
(
[GEN] => Celle
[cases] => 220
[deaths] => 15
)
...........我的代码
$url = "https://services7.arcgis.com/mOBPykOjAyBO2ZKk/arcgis/rest/services/RKI_Landkreisdaten/FeatureServer/0/query?where=GEN%20%3D%20%27CELLE%27&outFields=GEN,cases,deaths&outSR=4326&f=json";
$json = file_get_contents($url);
$data = json_decode($json,true); //decode json result as array and thenloop it
print '<pre>';
print_r($data);
foreach($data as $row){
echo $row['features']->$row['attributes']->$row['GEN'];
}我在阅读中哪里错了？它只需要读一下括号里的内容，对吗？
所以实际上是features> attributes-> Gen来获取GEN查询
回答 2
Stack Overflow用户
回答已采纳
发布于 2020-06-19 18:57:06
对不起，这是我的错，似乎没有读清楚你的问题。
使用GEN属性，您不需要使用循环来获取此值。
如果你想得到GEN，你的代码就应该是GEN。
$url = "https://services7.arcgis.com/mOBPykOjAyBO2ZKk/arcgis/rest/services/RKI_Landkreisdaten/FeatureServer/0/query?where=GEN%20%3D%20%27CELLE%27&outFields=GEN,cases,deaths&outSR=4326&f=json";
$json = file_get_contents($url);
$data = (array) json_decode($json, true); //decode json result as array and thenloop it
print '<pre>';
print_r($data);
echo $data['features']['attributes']['GEN'];
// foreach($data as $row){
// echo $row['features']->$row['attributes']->$row['GEN'];
// }Stack Overflow用户
发布于 2020-06-19 18:31:54
让我们尝试更改一下。
foreach($data as $row){
echo $row['features'][0]['attributes']['GEN'];
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/62468093
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