using variables GraphQL PHP - php

Question

I'm using the FXHash API to access listings with this query:
query Listings($sort: ListingsSortInput) {
listings(sort: $sort) {
amount
createdAt
price
issuer {
name
}
objkt {
name
}
}
}
$options = '{
"sort": {
"createdAt": "DESC"
}
}';
I'd like to use the query above in PHP with the sort by createdAt options. How can I fit this query in to my cURL with the sort options? I don't understand how to add the $options variable into the query. Thanks for the help!
$url = 'https://api.fxhash.xyz/graphql';
$curl = curl_init();
$queryData = array();
$data = array();
$queryData = '{
listings {
amount
createdat
price
issuer {
name
}
objkt {
name
}
}
}';
$data["query"] = $queryData;
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, TRUE);
curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));
curl_setopt($curl, CURLOPT_HEADER, FALSE);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json'
));

Answer 1

You must add the POST request variables as a JSON map.
Try something like this:
$queryData = 'query Listings($sort: ListingsSortInput) {
listings(sort: $sort) {
amount
createdAt
price
issuer {
name
}
objkt {
name
}
}
}';
$options = '{
"sort": {
"createdAt": "DESC"
}
}';
$data["query"] = $queryData;
$data["variables"] = $options;