PHP：如何从JSON数组中获取属性？

Question

我有以下JSON数组：

<?php    
$json = {
  "status": "OK",
  "results": [ {
    "types": [ "street_address" ],
    "formatted_address": "5721 N Northcott Ave, Chicago, IL 60631, USA",
    "address_components": [ {
      "long_name": "5721",
      "short_name": "5721",
      "types": [ "street_number" ]
    }, {
      "long_name": "Illinois",
      "short_name": "IL",
      "types": [ "administrative_area_level_1", "political" ]
    }, {
      "long_name": "60631",
      "short_name": "60631",
      "types": [ "postal_code" ]
    } ],
    "geometry": {
      "location": {
        "lat": 41.9858860,
        "lng": -87.7907460
      },
      "location_type": "ROOFTOP",
      "viewport": {
        "southwest": {
          "lat": 41.9827384,
          "lng": -87.7938936
        },
        "northeast": {
          "lat": 41.9890336,
          "lng": -87.7875984
        }
      }
    }
  } ]
};
?>

使用PHP，如何从上面的JSON数组中获取geometery->location->lat ＆ lng值？

例如（伪代码）：

<?php
$lat = $json['geometry']['location']['lat'];  // 41.9858860
$lng = $json['geometry']['location']['lng'];  // -87.7907460
?>

Answer 1

你使用json_decode然后$var->results[0]->geometry->location->lat; 。

json_decode产生以下结构：

object()[]
   'status' => string 'OK' 
   'results' => 
    array
      0 => 
        object()[]
           'types' => 
            array
              0 => string 'street_address' 
           'formatted_address' => string '5721 N Northcott Ave, Chicago, IL 60631, USA' 
           'address_components' => 
            array
              0 => 
                object()[]
                   'long_name' => string '5721' 
                   'short_name' => string '5721' 
                   'types' => 
                    array
                      0 => string 'street_number' 
              1 => 
                object()[]
                   'long_name' => string 'Illinois' 
                   'short_name' => string 'IL' 
                   'types' => 
                    array
                      0 => string 'administrative_area_level_1' 
                      1 => string 'political' 
              2 => 
                object()[]
                   'long_name' => string '60631' 
                   'short_name' => string '60631' 
                   'types' => 
                    array
                      0 => string 'postal_code' 
           'geometry' => 
            object()[]
               'location' => 
                object()[]
                   'lat' => float 41.985886
                   'lng' => float -87.790746
               'location_type' => string 'ROOFTOP' 
               'viewport' => 
                object()[]
                   'southwest' => 
                    object()[]
                       'lat' => float 41.9827384
                       'lng' => float -87.7938936
                   'northeast' => 
                    object()[]
                       'lat' => float 41.9890336
                       'lng' => float -87.7875984

Answer 2

你使用json_decode 。

例如：

$json_obj = json_decode($json);
echo $json_obj->results[0]->geometry->location->lat;

我们访问结果数组的第一个元素，然后浏览几何，位置和纬度属性。 您也可以使用关联数组，但默认为对象。

Answer 3

问候，

我建议阅读json_decode文档

  <?php 
     $obj = json_decode($json);
     $lat = $obj->results[0]->geometry->location->lat;
  ?>