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I am using drupal_http_request and drupal_json_decode to retrive and parse json from an external API in the feeds tamper by using the execute php code plugin. My code is as follows:

$json = "https://api.coursera.org/api/onDemandSpecializations.v1?ids=".$field;
$response = drupal_http_request($json);
$data = drupal_json_decode($response->data);
return ($data['elements'][0]['name']);

This returns a null value.

The json is as follows:

enter image description here

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If I'm not mistaken {} indicates that it is an object and [] means that the variable is an array, therefor, I would expect $data->elements[0]->name would be the way to get the value in your return statement.

To improve your code, I would advise to use the empty() (or isset()) functions to check whether the elements in $data exists

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  • Thanks.Doesn't drupal_json_decode convert the json object into a PHP array ?
    – user19466
    Commented Feb 12, 2017 at 0:19
  • Yes, I think you're right. Could you print out what is stored in $data (using dpm())?
    – Watergate
    Commented Feb 12, 2017 at 12:56
  • dpm($data) returns nothing, but $dpm($response) shows the corresponding json object. There must be some problem with the drupal_json_decode statement.
    – user19466
    Commented Feb 13, 2017 at 15:42
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    I changed the code to json_decode, and it works now. Thanks for the help @Watergate.
    – user19466
    Commented Feb 13, 2017 at 15:59

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