Parsing Json Response from api call - foreach error

Question

I am working with the instagram api. This question is not Instagram specific but more about parsing the response returned by the api call. The api works with pagination. With some research I found the way to fetch all the results in one huge bulk and avoid pagination. I am having an issue parsing the json file. In the foreach loop I attempt the parse but I get this error: Invalid argument supplied for foreach(). How could I parse the json file values properly in the foreach loop?

LINK to article that explains the process if not familiar with api

Issue Here: Trying to parse in foreach loop - Included a test access token. This can be tested from anywhere

$get_media_url = 'https://api.instagram.com/v1/tags/nataliguatemipoa/media/recent?access_token=6678174.467ede5.205a03ebc4b74d4082823781c3149575';

$media = getResults($get_media_url); //Look Below to find function details
foreach($media['data'] as $insta){
        $source_id = $insta['id'];
    }

Here’s an example of an Instagram response,

Array
(
    [0] => stdClass Object
        (
            [pagination] => stdClass Object
                (
                    [next_min_id] => 1407287255810188
                    [deprecation_warning] => next_max_id and min_id are deprecated for this endpoint; use min_tag_id and max_tag_id instead
                    [min_tag_id] => 1407287255810188
                )

            [meta] => stdClass Object
                (
                    [code] => 200
                )

            [data] => Array
                (
                    [0] => stdClass Object
                        (
                            [attribution] => 
                            [tags] => Array
                                (
                                    [0] => muff
                                    [1] => hairstylist
                                )
//Cut the rest for example purposes

Make the api call

function __apiCall($url, $post_parameters = FALSE) {

        // Initialize the cURL session
        $curl_session = curl_init();

        // Set the URL of api call
        curl_setopt($curl_session, CURLOPT_URL, $url);

        // If there are post fields add them to the call
        if($post_parameters !== FALSE) {
            curl_setopt ($curl_session, CURLOPT_POSTFIELDS, $post_parameters);
        }

        // Return the curl results to a variable
        curl_setopt($curl_session, CURLOPT_RETURNTRANSFER, 1);

        // Execute the cURL session
        $contents = curl_exec ($curl_session);

        // Close cURL session
        curl_close ($curl_session);

        // Return the response
        return  json_decode($contents);
    }

Fetch all pagination results

function getResults($url){

        $gotAllResults = false;
        $results = array();

        while(!$gotAllResults) {
        $result = $this-&gt;__apiCall($url);
        $results[] = $result;

        if (!property_exists($result-&gt;pagination, 'next_url')) {
            $gotAllResults = true;
        } else {
            $url = $result-&gt;pagination-&gt;next_url;
        }
    }

    return $results;

    }

Darren · Accepted Answer · 2014-11-20 06:19:51Z

1

The $insta is an object, not an array. You should be referencing as such:

foreach($media[data] as $insta){
    $source_id = $insta->id;
}

^{Objects are referenced as ->. Arrays are referenced as []}

One of two options here, you could try referencing it as this first one:

foreach($media['data'] as $insta){
    $source_id = $insta->id;
}

Or you could try as an object

foreach($media->data as $insta){
    $source_id = $insta->id;
}

edited Nov 20, 2014 at 6:19

answered Nov 20, 2014 at 5:43

Darren

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8 Comments

Code_Ed_Student Over a year ago

Ok it is still giving the same error of Invalid argument supplied for foreach()

Darren Over a year ago

What does print_r($media) supply?

Darren Over a year ago

But is data present in there?

Code_Ed_Student Over a year ago

Yes data is present

Darren Over a year ago

Showing that print_r($media) would be great so we can help you debug

|

Sougata Bose · Accepted Answer · 2014-11-20 06:31:41Z

0

Try with casting it to array -

foreach((array)$media[0]['data'] as $insta) {
   $source_id = $insta->id;
}

edited Nov 20, 2014 at 6:31

answered Nov 20, 2014 at 6:10

Sougata Bose

31.8k8 gold badges52 silver badges89 bronze badges

8 Comments

Code_Ed_Student Over a year ago

Ok so the error goes away but no values are placed in the foreach loop. It gives this error Notice: Undefined index: data in /index.php on line 226

Sougata Bose Over a year ago

var_dump($media) and add see what you are getting or display it.

Code_Ed_Student Over a year ago

array(1) { [0]=> object(stdClass)#3 (3) { ["pagination"]=> object(stdClass)#4 (3) { ["next_min_id"]=> string(16) "1407287255810188" ["deprecation_warning"]=> string(94) "next_max_id and min_id are deprecated for this endpoint; use min_tag_id and max_tag_id instead" ["min_tag_id"]=> string(16) "1407287255810188" } ["meta"]=> object(stdClass)#5 (1) { ["code"]=> int(200) } ["data"]=> array(3) { [0]=> object(stdClass)#6 (15)

Code_Ed_Student Over a year ago

It yield this error Cannot use object of type stdClass as array

Sougata Bose Over a year ago

it was coming because the $insta is an object.if $insta has id in next level then you can access it else again loop must be added.updated the answer.

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