CODEWITHSUNDEEP
php
user3140387
user3140387

Reputation: 9

trying to get propert of non object error

Following errors show up for the code given below:

Undefined property: stdClass::$duration in C:\wamp\www\temp\yy.php

trying to get property of non-object in C:\wamp\www\temp\yy.php

How to resolve?

$q = "http://maps.googleapis.com/maps/api/distancematrix/json?origins=$a,$b&destinations=$c,$d&mode=driving&sensor=false";
$json = file_get_contents($q);
$details = json_decode($json);
$d=$details->rows[0]->elements[0]->duration->text;

Upvotes: 0

Views: 122

Answers (2)

The Alpha
The Alpha

Reputation: 146201

You may try something like this:

if($details->rows[0]->elements[0]->status == 'OK') {
    $text = $details->rows[0]->elements[0]->duration->text;
}

If no results were returned then you may get following as $details->rows[0]->elements[0]:

stdClass Object
(
    [status] => ZERO_RESULTS
)

If a result were returned then you will get something like this as $details->rows[0]->elements[0]:

stdClass Object
(
    [distance] => stdClass Object
    (
        [text] => 1Â 716 km
        [value] => 1715523
    )

    [duration] => stdClass Object
    (
        [text] => 3 jours 19 heures
        [value] => 329133
    )

    [status] => OK
)

So, if $details->rows[0]->elements[0]->status is OK then there is a distance and a duration property and each one contains an stdClass object with two properties as text and value. Make sure you are passing right data within your variables ($a, $b, $c and $d).

Try this for example:

http://maps.googleapis.com/maps/api/distancematrix/json?origins=Vancouver+BC|Seattle&destinations=San+Francisco|Victoria+BC&mode=bicycling&language=fr-FR&sensor=false

Upvotes: 1

Sean Quinn
Sean Quinn

Reputation: 2171

The error message you're receiving is telling you exactly what the problem is. The duration property is not found on the object returned by json_decode; the above query you are making in the referenced code block (i.e. this one) returns the following JSON:

{
   "destination_addresses" : [ "Catamarca Province, Argentina" ],
   "origin_addresses" : [ "Augsburg, Germany" ],
   "rows" : [
      {
         "elements" : [
            {
               "status" : "ZERO_RESULTS"
            }
         ]
      }
   ],
   "status" : "OK"
}

Looking at this, there is no duration element returned in the above, therefore the following call:

$json = file_get_contents($q);
$details = json_decode($json);
$d=$details->rows[0]->elements[0]->duration->text;

Will result in the error you're seeing.

You can use error handling (e.g. try...catch) to get the duration and the text if it exists, or test to see if the property exists, etc.

Basically, what it boils down to is that without additional code, you can't rely on the fact that duration will be an element of that returned JSON and you have to account for it.

Upvotes: 0

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