Why is my PHP cURL POST request returning an empty array when sending JSON data?

How to POST JSON Data with PHP cURL, Return in Readable Format

Your code is not posting JSON data correctly, even at your server, it returns an empty array. To implement REST using JSON as in Shopify's API, we need to address this issue.

Correcting the POST Request

To fix the problem, we need to encode the entire POST data in JSON, not just the "customer" field. Modify your code as follows:

$ch = curl_init($url);
# Setup request to send JSON via POST.
$payload = json_encode(array("customer" => $data));
curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:application/json'));
# Return response instead of printing.
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
# Send request.
$result = curl_exec($ch);
curl_close($ch);
# Print response.
echo "<pre class="brush:php;toolbar:false">$result

";

Accessing the POST Data

On the other page, we cannot use $_POST to retrieve the POST data because of server-side parsing. Instead, use file_get_contents("php://input"), which contains the POSTed JSON. To view the data in a readable format:

echo '<pre class="brush:php;toolbar:false">'.print_r(json_decode(file_get_contents("php://input")),1).'

';

Additional Considerations

• Consider using a third-party library to interact with the Shopify API instead of directly interfacing with it yourself.
• Ensure the server is configured to receive JSON requests with the correct Content-Type header.

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