PHP: How do I get an attribute from a JSON array?

Question

I have the following JSON array:

<?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
        }
      }
    }
  } ]
};
?>

Using PHP, how do I get the geometery->location->lat&lng values from my JSON array above?

For example (pseudo code):

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

Artefacto · Accepted Answer · 2010-07-08 00:32:11Z

You use json_decode and then $var->results[0]->geometry->location->lat;.

json_decode yields the following structure:

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

Matthew Flaschen · Accepted Answer · 2010-07-08 00:24:52Z

3

You use json_decode.

E.g.:

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

We access the first element of the results array, then navigate through the geometry, location, and lat properties. You can also make it use associative arrays, but the default is an object.

edited Jul 8, 2010 at 0:24

answered Jul 8, 2010 at 0:16

Matthew Flaschen

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2 Comments

TeddyR Over a year ago

If I use json_decode, then what? How would I reference the LAT and LNG values?

TeddyR Over a year ago

I've actually already read the examples in that link and still couldn't figure it out. Which is why I'm posting this question to SO now

kobrien · Accepted Answer · 2010-07-08 00:25:16Z

2

Greetings,

I recommend reading the json_decode documentation

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

edited Jul 8, 2010 at 0:25

answered Jul 8, 2010 at 0:19

kobrien

3,1992 gold badges26 silver badges33 bronze badges

2 Comments

TeddyR Over a year ago

I've actually already read the examples in that link and still couldn't figure it out. Which is why I'm posting this question to SO now.

kobrien Over a year ago

Righteo. Well I hope you got it sorted.

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