PHP and JSON from Openstreetmap search - php

Question

I am trying to use Openstreetmap and PHP to point to a place on a map.
As you can see below, I retrieve a JSON array, but PHP returns a NULL value.
Note that my $url is a valid JSON (you can check it here).
<?
$url = 'http://nominatim.openstreetmap.org/search/Piazza%20Duomo%20Trento?format=json&addressdetails=1&limit=1&polygon_svg=1';
$html = file_get_contents($url);
$jsonout = json_decode($html);
echo $jsonout[0];
?>
What am I doing wrong?

Answer 1

What am I doing wrong?
First of all, your openning tag is not correct :
<? ----> <?php
Then, you cannot echo an array like that. Use var_dump on your array to see the structure.
When I try your code with the corrections, I got this :
array (size=1)
0 =>
object(stdClass)[1]
public 'place_id' => string '8577656' (length=7)
public 'licence' => string 'Data © OpenStreetMap contributors, ODbL 1.0. http://www.openstreetmap.org/copyright' (length=84)
public 'osm_type' => string 'node' (length=4)
public 'osm_id' => string '924463183' (length=9)
public 'boundingbox' =>
array (size=4)
0 => string '46.0675164' (length=10)
1 => string '46.0676164' (length=10)
2 => string '11.1217498' (length=10)
3 => string '11.1218498' (length=10)
public 'lat' => string '46.0675664' (length=10)
public 'lon' => string '11.1217998' (length=10)
public 'display_name' => string 'Piazza Duomo, Piazza del Duomo, centro storico Trento, Trento, TN, TAA, 38122, Italia' (length=85)
public 'class' => string 'highway' (length=7)
public 'type' => string 'bus_stop' (length=8)
public 'importance' => float 0.311
public 'icon' => string 'http://nominatim.openstreetmap.org/images/mapicons/transport_bus_stop2.p.20.png' (length=79)
public 'address' =>
object(stdClass)[2]
public 'bus_stop' => string 'Piazza Duomo' (length=12)
public 'pedestrian' => string 'Piazza del Duomo' (length=16)
public 'suburb' => string 'centro storico Trento' (length=21)
public 'city' => string 'Trento' (length=6)
public 'county' => string 'TN' (length=2)
public 'state' => string 'TAA' (length=3)
public 'postcode' => string '38122' (length=5)
public 'country' => string 'Italia' (length=6)
public 'country_code' => string 'it' (length=2)
public 'svg' => string 'cx="11.1217998" cy="-46.067566399999997"' (length=40)

Answer 2

In answer to your question, except for trying to output an array with the following statement
echo $jsonout[0];
Which will throw a Catchable fatal error: Object of class stdClass could not be converted to string
Everything is ok.
If this is about accessing the members of the json_decode return, see below
$jsonout is an array with one element,
that one element is an object, you can access its members like this
print $jsonout[0]->licence;
Which will output
Data © OpenStreetMap contributors, ODbL 1.0. http://www.openstreetmap.org/copyright
If you'd like an associative array, you can pass the second argument for json_decode, like this
$jsonout = json_decode($html,true);
print $jsonout[0]['display_name'];
Which will decode the json into an associative array and will display in a similar way
Piazza Duomo, Piazza del Duomo, centro storico Trento, Trento, TN, TAA, 38122, Italia

Answer 3

please use print_r() in place of echo
$url = "http://nominatim.openstreetmap.org/search/Piazza%20Duomo%20Trento?format=json&addressdetails=1&limit=1&polygon_svg=1";
$html = file_get_contents($url);
$jsonout = json_decode($html);
print_r($jsonout[0]);
and you will get your result.

Answer 4

or you can print $jsonout[0]["license"]