PHP: Using file_get_contents to access an API - Empty Response - php

Question

Sorry for the messy code in advance. I want to write a code which returns me infos from the official Blizzard API, which I can then print out on my homepage. The code doesn't throw any errors but it doesn't print out something either. For Starters:
I would also prefer using CURL, but my homepage is on a Wordpress Hosting Site and I don't know how to install the CURL Library that way
allow_furl_open is on
$url = "https://eu.battle.net/oauth/token";
$data = array('grant_type' => 'client_credentials');
//HTTP options
$opts = array('http' =>
array(
'method' => 'POST',
'header' => array ('Content-type: multipart/form-data', 'Authorization: Basic ' .
base64_encode("$client_id:$client_pass")),
'content' => json_encode($data)
)
);
//Do request
$context = stream_context_create($opts);
$json = file_get_contents($url, false, $context);
$result = json_decode($json, true);
$accessToken = $json['access_token'];
$tokenURL = "https://us.api.blizzard.com/data/wow/token/?namespace=dynamic-eu";
$opts2 = array('http' =>
array(
'method' => 'POST',
'header' => array('Content-type: multipart/form-data', 'Authorization: Bearer ' . $accessToken),
)
);
$context2 = stream_context_create($opts2);
$json2 = file_get_contents($tokenURL,false,$context2);
$result2 = json_decode($json2, true);
$tokenprice = $result2['price'];
echo "<p>Tokenpreis:" .$tokenprice. "</p>";
I didn't add the $client_id and $client_pass into the code snippet, but this exists obviously. I used this PHP CURL Snippet as template. And this is a short explanation on blizzard's site on how is this supposed to work:
Anyone got any ideas what went wrong? I am really out of ideas here and would love anyone who could help.
Thanks in advance

Answer 1

Based on the curl example from the linked API docs, the content type should be application/x-www-form-urlencoded, and so for the initial request to https://eu.battle.net/oauth/token you should be able to follow the example here.
In your case this will look something like:
$url = 'https://eu.battle.net/oauth/token';
$data = array('grant_type' => 'client_credentials');
$opts = array(
'http' => array(
'method' => 'POST',
'header' => array (
'Content-type: application/x-www-form-urlencoded',
'Authorization: Basic ' . base64_encode("$client_id:$client_pass")
),
'content' => http_build_query($data)
)
);
$context = stream_context_create($opts);
$json = file_get_contents($url, false, $context);
Also, in your code you are storing the raw result from the initial request in $json, then the decoded array in $result, but attempting to get the access_token from the initial request, instead of the decoded array.