使用PHP处理来自TFL的JSON响应？
使用PHP处理来自TFL的JSON响应？
提问于 2016-04-08 15:46:43
我正试图从API获得以下JSON响应中的某些信息。这是实际API call。
{
"$type": "Tfl.Api.Presentation.Entities.PlacesResponse, Tfl.Api.Presentation.Entities",
"centrePoint": [
51.555,
0.059
],
"places": [{
"$type": "Tfl.Api.Presentation.Entities.StopPoint, Tfl.Api.Presentation.Entities",
"naptanId": "490009219W",
"indicator": "Stop B",
"stopLetter": "B",
"modes": [
"bus"
],
"icsCode": "1009219",
"stopType": "NaptanPublicBusCoachTram",
"stationNaptan": "490G00009219",
"lines": [{
"$type": "Tfl.Api.Presentation.Entities.Identifier, Tfl.Api.Presentation.Entities",
"id": "25",
"name": "25",
"uri": "/Line/25",
"type": "Line"
}, {
"$type": "Tfl.Api.Presentation.Entities.Identifier, Tfl.Api.Presentation.Entities",
"id": "86",
"name": "86",
"uri": "/Line/86",
"type": "Line"
}, {
"$type": "Tfl.Api.Presentation.Entities.Identifier, Tfl.Api.Presentation.Entities",
"id": "w19",
"name": "W19",
"uri": "/Line/w19",
"type": "Line"
}],
"lineGroup": [{
"$type": "Tfl.Api.Presentation.Entities.LineGroup, Tfl.Api.Presentation.Entities",
"naptanIdReference": "490009219W",
"stationAtcoCode": "490G00009219",
"lineIdentifier": [
"25",
"86",
"w19"
]
}],
"lineModeGroups": [{
"$type": "Tfl.Api.Presentation.Entities.LineModeGroup, Tfl.Api.Presentation.Entities",
"modeName": "bus",
"lineIdentifier": [
"25",
"86",
"w19"
]
}],
"status": true,
"id": "490009219W",
"commonName": "Little Ilford Lane",
"distance": 64.10041498232529,
"placeType": "StopPoint",
"additionalProperties": [{
"$type": "Tfl.Api.Presentation.Entities.AdditionalProperties, Tfl.Api.Presentation.Entities",
"category": "Direction",
"key": "CompassPoint",
"sourceSystemKey": "Naptan490",
"value": "W"
}, {
"$type": "Tfl.Api.Presentation.Entities.AdditionalProperties, Tfl.Api.Presentation.Entities",
"category": "Direction",
"key": "Towards",
"sourceSystemKey": "CountDown",
"value": "East Ham or Manor Park"
}],
"lat": 51.554475,
"lon": 0.059381
}]
}
我想要获得naptanId，行标识符和指向作为名称值对，并打印它们。例如,
- 凝固剂:490009219W；
- 行标识符，不管这些值是什么
- 朝向："Eastham or manor park“
请帮帮我，我是初学者，谢谢
回答 1
Stack Overflow用户
回答已采纳
发布于 2016-04-08 17:46:03
根据您的问题，您似乎只对返回的第一个place的值感兴趣，所以我将在答案中假设这一点。
要将数据从API中获取到对象结构中(与最初获得的JSON字符串相反)：
$data = json_decode(file_get_contents('https://api.tfl.gov.uk/Place?lat=51.555504&lon=0.0592359&radius=200&includeChildren=False&type=NaptanPublicBusCoachTram&app_id=&app_key='), true);以获得naptanId
$naptanId = $data['places'][0]['naptanId'];要获得lineIdentifier，我假设它来自第一个lineGroup元素(不是lineModeGroups，但可以酌情更改)：
$lineIdentifier = $data['places'][0]['lineGroup'][0]['lineIdentifier'];此值将是一个数组。
要获得towards值要复杂一些，因为您需要根据子键过滤additionalProperties数组，然后取出value；同样，我假设您只对第一个值感兴趣：
$towards = array_values(array_filter(
$data['places'][0]['additionalProperties'],
function ($property) {
return $property['key'] === 'Towards';
}
))[0]['value'];对array_filter的调用提取了additionalProperties元素key === 'Towards' (注意，这假设大小写敏感，如果您想不敏感地匹配大小写，可以添加strtolower并将字符串文本更改为'towards' )。对array_values的调用对于规范数组索引是必要的。然后，我们提取第一个元素[0]并得到它的value属性。
请注意，上面的代码不执行任何错误检查，例如，如果API调用不返回任何places，那么第一次执行$data['places'][0]时它将失败。如果您需要处理这些情况(您几乎肯定会这样做)，那么您需要预先检查这些情况，例如：
if (!isset($data['places']) || sizeof($data['places']) === 0) {...}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/36503939
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