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，我如何从上面的 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

您使用 json_decode然后是 $var->results[0]->geometry->location->lat;.

json_decode 产生以下结构:

object(stdClass)[1]  public 'status' => string 'OK' (length=2)  public 'results' =>     array      0 =>         object(stdClass)[2]          public 'types' =>             array              0 => string 'street_address' (length=14)          public 'formatted_address' => string '5721 N Northcott Ave, Chicago, IL 60631, USA' (length=44)          public 'address_components' =>             array              0 =>                 object(stdClass)[3]                  public 'long_name' => string '5721' (length=4)                  public 'short_name' => string '5721' (length=4)                  public 'types' =>                     array                      0 => string 'street_number' (length=13)              1 =>                 object(stdClass)[4]                  public 'long_name' => string 'Illinois' (length=8)                  public 'short_name' => string 'IL' (length=2)                  public 'types' =>                     array                      0 => string 'administrative_area_level_1' (length=27)                      1 => string 'political' (length=9)              2 =>                 object(stdClass)[5]                  public 'long_name' => string '60631' (length=5)                  public 'short_name' => string '60631' (length=5)                  public 'types' =>                     array                      0 => string 'postal_code' (length=11)          public 'geometry' =>             object(stdClass)[6]              public 'location' =>                 object(stdClass)[7]                  public 'lat' => float 41.985886                  public 'lng' => float -87.790746              public 'location_type' => string 'ROOFTOP' (length=7)              public 'viewport' =>                 object(stdClass)[8]                  public 'southwest' =>                     object(stdClass)[9]                      public 'lat' => float 41.9827384                      public 'lng' => float -87.7938936                  public 'northeast' =>                     object(stdClass)[10]                      public 'lat' => float 41.9890336                      public 'lng' => float -87.7875984